Boreantrops emarginatus, 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 : 338-339

Boreantrops emarginatus sp. nov.

( Figs. 7 , 18, 22, 25, 29, 84, 85, 124)

Diagnosis. Separable from other members of the emarginatus group by the following characters: Occiput black, prementum orange. Anterior margin of anepisternum with microtomentum below spiracle. Mid tibia with row of anterodorsal bristles. Hind tibia with anteroventral bristle just past half, with two ventroapical bristles. Wing without white spots. Male sternite 5 with deep V-shaped notch in posterior margin.

Description. Head orange, occiput black, ocellar triangle brown, prementum brown to dark brown. Ventral corners of face may be somewhat darker. Mostly covered with microtomentum, frons with shiny spots lateral to ocelli ( Fig. 29 ), face mostly shiny with microtomentum below antenna and lunule. Ocellar bristles just anterior to median ocellus. Subvibrissal and anterior genal bristles about 0.5X length of vibrissa.

Thorax black, mostly covered with microtomentum. Proepisternum shiny, anepisternum with ventromedial shiny spot covering about three-quarters height and half length of sclerite, katepisternum with a shiny spot behind fore coxa, thin shiny stripe along margin of meron and metapleuron, metapleuron with a shiny spot in posteroventral corner ( Fig. 7 ). Halter white, brownish below knob.

Legs black, joints and trochanters reddish brown, tarsi yellow except distal 3 tarsomeres of fore tarsus brown. Fore basotarsomere with a small spur in male. Mid tibia with row of anterodorsals, 1 anteroventral, 1 posteroventral, 5 subapical bristles. Hind tibia with 2 ventroapical bristles.

Wing brown, veins dark brown, crossveins r-m and dm-cu paler (Fig. 18).

Abdomen with tergites and sternites weakly sclerotized. Syntergite 1+2 with posterolateral corners and a thin band between them strongly sclerotized, tergites 3–4 with a thin posterior band moderately sclerotized ( Fig. 22 ).

Male postabdomen: Sternite 5 long, lateral margins rounded, posterior margin with a deep V-shaped notch, anterior apodeme broad for most of its length with a pointed tip, with a prominent dorsal keel ( Fig. 85 ). Epandrium fused between anal opening and cerci ( Fig. 25 ). Surstylus paddle-shaped, anterior face covered with setae. Pregonite indistinct, fused with postgonite. Postgonite with distal portion narrow, lobes overlapping, both narrow, truncate, posterior lobe longer. Basiphallus with very broad epiphallus, narrow preepiphallus. Distiphallus with long dorsal tube, straight and with a few spines medially, flanked by a single spike-like sclerite ( Fig. 84 ).

Female postabdomen: Tergites 6–7 sclerotized along anterior and lateral margins only, sternites 6–7 mostly sclerotized. Tergites with 3 posterior strips, sternites with 2 posterior strips. Tergite 8 covered with microtomentum except anterior margin, shallowly emarginated anteriorly and posteriorly. Epiproct with very short anterior arms, microtomentum medially, with 2 pairs of setae. Cerci long, narrow. Sclerites of sternite 8 subrectangular, broadened at apex, covered with microtomentum except anterior margin. Hypoproct subrectangular. Spermathecae barrel-shaped, slightly longer than wide, long apical invagination meeting basal invagination, sclerotized duct about as long as bulb.

Type material. Holotype ♂: GUATEMALA: Guatemala: Santa Catarina Pinula, 1840 m, dung traps, 10–11 Jun 1991, B.D. Gill, debu01039490 ( DEBU). Paratypes: same data as holotype (51 ♂, 49 ♀, DEBU); as above but [no collection method], 11–13 Jun 1991 (1 ♂, 1 ♀, DEBU); Baja Verapaz: Purulhá, 7.4 km S, 1650 m, FIT, 2 Jul 1993, Ashe & Brooks (1 ♂, DEBU); Purulhá, 8 km S, FIT, 29 May 1991, H. & A. Howden (5 ♂, 1 ♀, DEBU); as above but dung trap, 25 May 1991 (8 ♂, 11 ♀, DEBU); El Progreso: Cerro Pinalón, 2550 m, cloud forest, Malaise trap, 29 Apr–5 May 2009, [no collector] (1 ♀, UVGC); as above but 2560 m, 30 Apr–5 May 2009 (2 ♀, DEBU, UVGC); Quetzaltenango: Zunil, 8 km SE, 2450 m, FIT, 19–21 Jun 1993, Ashe & Brooks (2 ♂, 2 ♀, DEBU); as above but FIT #1, 17–19 Jun 1993 (3 ♂, 1 ♀, DEBU); as above but 2480 m, FIT #2, 17–19 Jul 1993 (1 ♂, 1 ♀, DEBU); Sacatepéquez: Antigua, 5 km SE, 2330 m, oak forest, Malaise trap, 10–13 Jun 2009, [no collector] (1 ♀, DEBU); San Marcos: San Antonio Sacatepéquez, 8000 ft, 29 Sep 1986, M.J. Sharkey (1 ♂, DEBU); Zacapa : San Lorenzo, 7 km N, 2000 m, dung, 10–17 Jun 1993, B.D. Gill (6 ♂, 15 ♀, DEBU). MEXICO: Chiapas: Coapilla, 5 km NE, 1990 m, 2° mesophil forest, Malaise trap, 25 May–14 Jun 2008, [no collector] (1 ♂, CEET); El Triunfo, 49 km S Jaltenango, 1300–2000 m, 13–15 May 1985, W.N. Mathis (2 ♂, USNM); Lagos de Montebello, Lago Pojoj, 1500 m, FIT, 2–12 Jun 1990, B. Gill (5 ♀, DEBU); San Cristóbal de las Casas, dung traps, 26–28 May 1990, B. Gill (11 ♂, 7 ♀, DEBU); Hidalgo: Jacala, 12 mi SW, 1890 m, walnut, oak, dung, 23–30 Jun 1971, A. Newton (2 ♂, 6 ♀, DEBU); as above but 6200 ft, walnut, oak, pine, dung trap (1 ♂, CNCI); Morelos: Tres Cumbres, 4 mi. W, 2713 m, oak, human dung, 29 Aug–4 Sep 1971, A. Newton (2 ♀, DEBU); Tres Cumbres, 8 mi. S, 7400 ft, oak/pine forest, dung, 29 Aug–4 Sep 1971, A. Newton (1 ♀, DEBU); Oaxaca: Valle Nacional, 29.7 mi S, 2073 m, cloud forest, carrion, 11–17 Aug 1973, A. Newton (1 ♂, DEBU); as above but dung, 11 Aug 1973 (1 ♂, DEBU); Sinaloa: El Palmito, 4.5 mi W, 6500 ft, 4 Aug 1964, W.R.M. Mason (1 ♂, CNCI); Veracruz: Jalapa, 1–6 Aug 1961, R. & K. Dreisbach (1 ♂, USNM).

Distribution. Widespread from Guatemala north to Sinaloa (Fig. 124). Elevations from 1500–2700 m.

Etymology. The species name is from the Latin emarginatus (notched), referring to the deeply notched male sternite 5.

Figures

FIGURES 5 – 8. Boreantrops specimens, head and thorax, lateral. 5) B. costaricensis; 6) B. peruvianus; 7) B. emarginatus; 8) B. subemarginatus.

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

FIGURES 78 – 85. Boreantrops male terminalia. B. auranticeps: 78) phallus, postgonite, and phallapodeme, lateral view, 79) sternite 5, 80) right surstylus, interior view; B. boliviensis: 81) phallus, postgonite, and phallapodeme, lateral view; B. challabamba: 82) phallus, postgonite, and phallapodeme, lateral view, 83) right surstylus, interior view; B. emarginatus: 84) phallus, postgonite, and phallapodeme, lateral view, 85) sternite 5. prj: projection of the postgonite.

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