Boreantrops inbio, Kits, Joel H. & Marshall, Stephen A., 2015

Kits, Joel H. & Marshall, Stephen A., 2015, A revision of Boreantrops Kits & Marshall (Diptera: Sphaeroceridae: Archiborborinae), Zootaxa 3915 (3), pp. 301-355 : 323-325

Boreantrops inbio sp. nov.

( Figs. 1 , 12 , 21 , 24 , 26 , 51, 52 , 71, 113)

Diagnosis. Separable from other members of the mexicanus subgroup by the following combination of characters: Leg joints narrowly orange. Mid tibia with 1 anterodorsal bristle. Mesoscutum strongly sculptured. Male sternite 5 bell-shaped, with a notch in posterior margin. Male distiphallus with dorsal tube broad at tip.

Description. Head orange, occiput ranging from mostly orange with black restricted to area around foramen ( Fig. 1 ) to mostly black with orange around posterior margin of eye ( Fig. 12 ), ocellar triangle may be brownish, prementum orange to dark brown with ventral third orange, maxillary palp yellow. Mostly covered with microtomentum, face shiny with thin line of microtomentum below lunule and antenna. Frons with variable extent of microtomentum, from mostly covered with shiny spots lateral to ocelli (as in Fig. 29 ) to mostly shiny with patches of microtomentum at anterior corners and reaching anteriorly to orbital and ocellar bristles ( Fig. 26 ). Ocellar bristles at level of anterior margin of median ocellus. Subvibrissal bristle and anterior genal bristles about 0.5X length of vibrissa.

Thorax black, mostly covered with microtomentum. Proepisternum shiny, anepisternum with microtomentum along dorsal third and posterior third and in a thin line along anterior margin below spiracle, katepisternum with a shiny spot behind fore coxa, meron shiny, metapleuron shiny with a stripe of microtomentum between posterior spiracle and hind coxa. Mesoscutum sculptured ( Fig. 12 ). Halter white, brownish below knob.

Legs black, joints and trochanters reddish brown to dark brown, fore and hind tarsi with 2 basal tarsomeres ivory white and 3 distal tarsomeres brown, mid tarsus with all tarsomeres yellow, or with 2 basal tarsomeres ivory white and 3 distal tarsomeres brown. Mid tibia with 1 anteroventral, 1 posteroventral, 6 subapical bristles. Hind tibia with 1 ventroapical bristle.

Wing brown, veins dark brown, crossveins r-m and dm-cu white, vein R4+5 with 2 pale spots distal to crossvein r-m, spots more prominent in specimens with darker occiputs.

Abdominal syntergite 1+2 heavily sclerotized with a semicircular weakly sclerotized patch anteriorly, black, covered with microtomentum. Tergites 3–4 with heavily sclerotized bars medially, otherwise weakly sclerotized, tergite 5 weakly sclerotized ( Fig. 21 ). Sternites weakly sclerotized.

Male postabdomen: Sternite 5 narrow anteriorly, posterior corners strongly divergent, posterior margin with a deep notch and interrupted row of setae, anterior apodeme broad, about as long as external portion, without keel ( Fig. 52 ). Surstylus paddle-shaped. Hypandrial arms with ventral tab-like structures ( Fig. 24 ). Pregonite small, discrete. Postgonite with lobes widely separated, anterior lobe broad, rounded, posterior lobe pointed. Basiphallus with long epiphallus, broad, transparent preepiphallus. Distiphallus with strongly curved spinose dorsal tube, distal portion long, broad apically ( Fig. 51 ).

Female postabdomen: Tergites 6–7 with anterior and lateral margins heavily sclerotized, center and posterior margin not sclerotized. Tergite 8 covered with microtomentum, except anterior margin. Epiproct without anterior arms, mostly covered with microtomentum except anterior corners, with 2 setae. Cerci broad. Sternites 6–7 with margins heavily sclerotized, center not sclerotized. Sclerites of sternite 8 broadest posteriorly, posterior half covered with microtomentum. Hypoproct lozenge-shaped, covered with microtomentum. Spermathecae about 2X longer than wide, annulated, apex invaginated, sclerotized duct about 1.5X as long as bulb (Fig. 71).

Type material. Holotype ♂: COSTA RICA: Cartago: Tapantí Natl. Pk., above Ranger Stn., ca. 1250 m, human dung trap, 11–12 Oct 1999, S.A. Marshall, debu00103499 ( INBC). Paratypes: same data as holotype (3 ♂, 2 ♀, DEBU, INBC); as above but sweeping trail/road, 12 Oct 1999 (1 ♂, 1 ♀, DEBU); Cerro de la Muerte, La Cangreja, 1 Jul 1991, P. Hanson (1 ♂, DEBU); La Suiza, Mar 1926, P. Schild (1 ♂, USNM); Tapantí Natl. Pk., 1550 m, pans in fallen tree, 7–12 Oct 1999, Marshall & Buck (1 ♀, DEBU); as above but 1650–1750 m, 7 Oct 1999 (1 ♂, DEBU); Tapantí Natl. Pk., Arboles Caídos Trail, ca. 1300 m, 11 Oct 1999, S.A. Marshall (1 ♂, DEBU); Tapantí Natl. Pk., Ranger Stn., 1200 m, human dung, hand & traps, 9–12 Oct 1999, Buck & Marshall (1 ♀, DEBU); as above but pans in kitchen refuse, 7–11 Oct 1999, M. Buck (1 ♀, DEBU); Tapantí Natl. Pk., rd. nr. represa, 1650 m, agouti dung, 8 Oct 1999, M. Buck (1 ♀, DEBU); Alajuela: Peñas Blancas, 700 m, rainforest, Malaise, 23 May 1987, Eladio Cruz (2 ♀, ROME); Heredia: Braulio Carrillo Natl. Pk., Barva Biol. Stn., trail to laguna, 2600–2760 m, 20 Feb 2003, S.A. Marshall (1 ♂, DEBU); Moravia, nr. border of Braulio Carrillo Ntnl. Pk., creek bed, yellow pans, 3–4 Mar 1996, L. Masner (1 ♂, 6 ♀, DEBU); Puntarenas: Estación la Casona, R.B. Monteverde, 1520 m, 9–31 Mar 1993, N. Obando, G. Barbosa, A. Pound & A. Pereira (1 ♀, INBC); Estación la Casona, R.B. Monteverde, A.C. Arenal, 1520 m, 31 Dec 1993, N.G. Obando (1 ♀, INBC); Las Alturas Bio. Stn., Cerro Chai, 2500 m, 15 Aug 1995, S.A. Marshall (3 ♂, 1 ♀, DEBU); Monteverde, 3 dung traps, 27 Feb 1991, H. & A. Howden (5 ♂, 3 ♀, DEBU); as above but FIT, 25 Feb 1991 (1 ♀, DEBU); as above but 1385 m, banana plantation, Malaise trap, 18–25 May 1988, B. Hubley, D. Bell (1 ♂, ROME); as above but 1400 m, 1 Feb–1 Mar 1988, B. Hubley (1 ♂, ROME); as above but 1500 m, 20 Feb 1980, D.M. Wood (1 ♀, DEBU); as above but Malaise trough, 23–27 Feb 1991, B.J. Sinclair (1 ♀, DEBU); as above but cloud forest, dung traps, 19–25 Aug 1993, E.R. Barr (1 ♂, 1 ♀, DEBU); as above but rain forest, 29 Feb 1980, Mason & Wood (1 ♂, 1 ♀, CNCI); as above but 1500–1600 m, yellow pan trap, 23–27 Feb 1991, B.J. Sinclair (2 ♂, 1 ♀, CNCI); as above but 1560 m, dung trap, 11–18 Jun 1983, D.H. Lindeman (1 ♂, DEBU); as above but 1700–1800 m, yellow pan trap, 23–27 Feb 1991, B.J. Sinclair (1 ♀, CNCI); Monteverde Biol. Res., 1500 m, 13 Jun 2000, S.A. Marshall (3 ♂, 1 ♀, DEBU); as above but on dung, 12 Jun 2000 (1 ♂, 1 ♀, DEBU); as above but on log over trail, 11 Jun 2000 (1 ♂, DEBU); as above but sweeping, 26 May 1998 (1 ♂, DEBU); as above but sweeping tree fall & trail, 14 Jun 2000, M. Buck (2 ♀, DEBU); as above but cloud forest, 11–13 Jun 2000, S.A. Marshall (4 ♂, 2 ♀, DEBU); as above but Malaise trap, 13 Jun 2000, L.W. Quate (1 ♂, DEBU); as above but pans along stream, 12–13 Jun 2000, M. Buck (1 ♂, 2 ♀, DEBU); as above but 13–14 Jun 2000 (1 ♂, 1 ♀, DEBU); as above but sweeping, 11 Jun 2000 (1 ♀, DEBU); as above but 1550 m, along creek, yellow pans, 18 Mar 1996, L. Masner (2 ♂, 5 ♀, DEBU); Monteverde Biol. Stn., 1500 m, dung RET, 26 May 1998, S.A. Marshall (1 ♂, DEBU); Puntarenas, 2000 m, 12 Aug 1995, S.A. Marshall (1 ♂, DEBU); San José: San Antonio de Escazu, 1300 m, 1 Jun 1988, W. Eberhard (1 ♂, 1 ♀, INBC); as above but creek bed, yellow pans, 4–5 Mar 1996, L. Masner (2 ♂, 2 ♀, DEBU); San Gerardo de Dota, 2200–2600 m, 7–10 Aug 1995, J.M. Cumming (1 ♀, CNCI); as above but 2400–2600 m, nr. trail, 8–9 Aug 1995, S.A. Marshall (1 ♂, DEBU); as above but 2500 m, wet trail, sweeping, 10 Aug 1995 (1 ♂, DEBU); San Gerardo de Dota, Río Savegre, 2200 m, river bed, yellow pans, 19 Mar 1996, L. Masner (1 ♂, DEBU); San Gerardo de Dota, Savegre Lodge, 14 Feb 2008, S.A. Marshall (3 ♂, 2 ♀, DEBU); as above but 19 Feb 2008 (1 ♂, DEBU); San José, km 74 SE, dung trap, 25 Feb 1984, H.F. Howden (2 ♂, DEBU); Zurquí de Moravia, 1600 m, 1 Feb 1989, P. Hanson (1 ♀, INBC); as above but 19 Feb 2003, N.E. Woodley (1 ♂, USNM); as above but Malaise trap, 1 Mar 1992, P. Hanson (1 ♀, USNM); as above but 1 May 1989 (1 ♂, 1 ♀, DEBU). GUATEMALA: Baja Verapaz: Chilasco, 6.6 km W, 1700m, dung, 30 May 1991, H. Howden (1 ♂, DEBU); Purulhá, 8 km S, dung trap, 25 May 1991, H. & A. Howden (2 ♂, DEBU); Guatemala: Fraijanes, Finca San Antonio, 1800 m, 14 Feb 1987, J. Manger (4 ♂, DEBU); Guatemala City, Universidad del Valle, dung traps, 11–13 Jun 1991, B.D. Gill (1 ♂, DEBU); Santa Catarina Pinula, 1840 m, 10–11 Jun 1991, B.D. Gill (1 ♂, DEBU); as above but dung traps, 11–13 Jun 1991 (31 ♂, DEBU); Zacapa : San Lorenzo, 7 km N, 2000 m, dung, 10–17 Jun 1993, B.D. Gill (1 ♂, DEBU). HONDURAS: Francisco Morazán: Cerro Uyuca, 1800 m, FIT, 3 Jun 1994, H. Howden (1 ♂, DEBU); as above but Malaise, 27 May 1994 (3 ♂, DEBU); as above but Malaise trap, 10 May 1994, H. & A. Howden (2 ♂, DEBU); as above but dung traps, 10 Jun 1994 (1 ♂, DEBU). MEXICO: Chiapas: Custepec, 3 km SE, 1660 m, mesophil forest stream, Malaise trap, 17 May 2008, [no collector] (2 ♂, DEBU, CEET); Lagos de Montebello, Lago Pojoj, 1500 m, FIT, 2–12 Jun 1990, B. Gill (4 ♂, DEBU); Veracruz: Fortin de las Flores - Sumidero, Planta de las Cervercería, Ing. Daniel Rabago Res., 2500–3000 ft, Malaise trap, 20–23 May 1965, H.V. Weems (1 ♂, FSCA). NICARAGUA: Nueva Segovia: Jalapa, 9 km NW, 1770 m, shade coffee, ex. sifted leaf litter, 29 May 2011, [no collector] (1 ♂, DEBU). PANAMA: Chiriquí: Cerro Punta, 2 km E, 1760 m, Baldwin forest, carrion, 30 May–8 Jun 1977, S. Peck (3 ♂, 1 ♀, DEBU); as above but dung traps (3 ♂, 2 ♀, DEBU); Cerro Punta, 2 km W, 1760 m, Baldwin forest, dung, 5 Jun 1977, S. Peck (1 ♂, DEBU); Cerro Punta, 5 km ESE, 2600 m, dung traps, 23–28 May 1977, S. Peck (1 ♂, 1 ♀, DEBU); Cerro Punta, 22 km W, 1760 m, collected on dung, 8 May 1977, S. Peck (5 ♂, 5 ♀, USNM); Hartmann's Finca, 15 km NW Hato de Volcán, 1200 m, dung trap, 20–25 May 1977, S. Peck (2 ♂, DEBU); as above but 20–31 May 1977 (1 ♂, 2 ♀, DEBU); La Fortuna Dam, 1000 m, 5–6 Jul 1981, B. Gill (10 ♂, 7 ♀, DEBU).

Distribution. Widespread from Panama north to Veracruz (Fig. 113). Elevations from 700–2600 m.

Etymology. The species name is an arbitrary combination of letters honouring the Instituto Nacional de Biodiversidad of Costa Rica.

Comments. This species is rather variable, with head colour, pattern of microtomentum on the frons, wing pigmentation, and mid tarsus colouration varying between specimens. No genitalic differences could be found to suggest these variations indicate species differences.

Figures

FIGURES 1 – 4. Boreantrops, images of living flies. 1) B. inbio, San Gerardo de Dota, San José, Costa Rica; 2) B. albipes, San Gerardo Biological Station, Alajuela, Costa Rica; 3) B. wayqecha, Wayqecha Biological Station, Cusco, Peru; 4) B. auranticeps, Bellavista Cloud Forest Reserve, Pichincha, Ecuador. 1, 3, and 4 by SAM, 2 by Morgan Jackson, used with permission.

FIGURES 9 – 14. Boreantrops specimens, head and thorax, dorsal. 9) B. albipes; 10) B. avignis; 11) B. hispidus; 12) B. inbio; 13) B. subemarginatus; 14) B. zacapa. ads: additional setulae.

FIGURES 21 – 23. Boreantrops specimens, abdomen dorsal. 21) B. inbio; 22) B. emarginatus; 23) B. cryptopygium. t 1 – 5: tergites 1 to 5.

FIGURES 24 – 25. Boreantrops specimens, postabdomen lateral. 24) B. inbio; 25) B. emarginatus. he: hypandrial extension.

FIGURES 26 – 29. Boreantrops heads, dorsal (anterior at top). 26) B. inbio; 27) B. boliviensis; 28) B. challabamba; 29) B. emarginatus. Some setae omitted.

FIGURES 49 – 54. Boreantrops male terminalia. B. hondurensis: 49) phallus, postgonite, and phallapodeme, lateral view, 50) sternite 5; B. inbio: 51) phallus, postgonite, and phallapodeme, lateral view, 52) sternite 5; B. longiphallus: 53) phallus, postgonite, and phallapodeme, lateral view, 54) sternite 5.