Thoron rivalis, JOHNSON & MASNER, 2004

JOHNSON, NORMAN F. & MASNER, LUBOMIR, 2004, The Genus Thoron Haliday (Hymenoptera: Scelionidae), Egg-Parasitoids of Waterscorpions (Hemiptera: Nepidae), with Key to World Species, American Museum Novitates 3452, pp. 1-16 : 14-15

Thoron rivalis , new species

Figures 6 , 12

DESCRIPTION: Length 2.5 mm. Female A4 subequal to or shorter than A3; clava robust, 3.5 times longer than wide (fig. 6); apex of A1 at same level as top of head (lateral view with A 1 in flexed position); female A2–A7 dark brown; male A11 2.0–2.3 times longer than wide; ocelli large, lateral ocellus separated from inner orbit by one­half diameter of posterior ocellus; central portion of mesoscutum and scutellum at most with minute setigerous punctures; notaulus long, extending anteriorly beyond level of posterior margin of tegula; metapleuron sparsely setose anteriorly, posterior portion of metapleuron and lateral face of propodeum nearly glabrous; marginalis not thickened, as wide as submarginal or basal portion of stigmal vein; postmarginal vein clearly developed, longer than stigmal vein; dorsellum spinose medially, short, subtriangular; dorsal surface of propodeum not excavate; all coxae yellow; hindfemur partly to entirely dark brown; T1 without hump (fig. 12), longitudinally costate throughout; costae on T2 reaching at least to posterior third of tergite; T2 as long as or slightly longer than T3; T3 wider than long.

DIAGNOSIS: Most similar to T. garciai , distinguished from it by the darkened hindfemora in the male, T3 subequal to or longer than T2, and the more elongate female antennal clava.

ETYMOLOGY: From the Latin rivalis , meaning of a stream, referring to its association with a small permanent stream at the type locality.

MATERIAL EXAMINED: Holotype female: BRA­ ZIL: Goiás, Niquelândia, Serra da Mesa Survey , 14 ° 01.4 ̍ S, 48 ° 18.5 ̍ W, 4.x.1995, N.F. Johnson, yellow pan trap along small stream, OSUC 10670 ( MZSP) . Paratypes. 33, 3♀ with same data as holotype ( OSUC 10460 , 10516 , 10619 , 10433 10622, 10786) . Specimens with same locality, method, and collector: 27.ix.1995, 13 ( OSUC 12369 ) ; 28.ix.1995, 1♀ ( OSUC 134089 ) ; 30.ix.1995, 23, 2♀ ( OSUC 335 , 336 , 162 , 197 ) ; 1.x.1995, 2♀ ( OSUC 13731 , 137980 ) ; 2.x.1995, 13, 3♀ ( OSUC 134677 , 134725 , 134680 , 134785 ) ; 3.x.1995, 13, 2♀ ( OSUC 131708 , 131732 , 131765 ) ; 5.x.1995, 33, 2♀ ( OSUC 110130 , 110138 , 110152 , 110134 , 110154 ) . Goiás, Niquelândia , 14 ° 01.3 ̍ S, 48 ° 18.4 ̍ W, 4– 5.x.1995, N.F. Johnson, malaise trap, 13 ( OSUC 114 ) . Goiás, Campinaçu, Serra da Mesa survey, 13 ° 52.0 ̍ S, 48 ° 23.2 ̍ W, 23–25.ii.1996, A. Sharkov, F. Ejchel, creek yellow pan traps, 13 ( OSUC 131144 ) . Goiás, Campinaçu, Serra da Mesa survey, 13 ° 52.0 ̍ S, 48 ° 23.2 ̍ W, 23–25.ii.1996, A. Sharkov, F. Ejchel, creek yellow pan traps, 2♀ ( OSUC 131350 , 131296 ) . São Paulo: Salesópolis, Estação Biológica Boracéia , Trilha dos Pilões , 23 ° 39 ̍ 07 ̎ S, 45 ° 53 ̍ 48.5 ̎ W, 19–22.x.2002, bandejas amarelas, A.P. Aguiar, J.S. Freitas, 1♀ ( OSUC 119925 ) . PANAMA: Colón, Quebrada López, nr. Sabanita , 120 m, 9 ° 19 ̍ 19 ̎ N, 79 ° 47 ̍ 54 ̎ W, 16.i.2001, L. Masner, yellow pan trap, 13 ( OSUC 77438 ) . Veraguas, 1.3 km S Santa Fe´, 300 m, creek bed, 8 ° 30 ̍ 00 ̎ N, 81 ° 04 ̍ 21 ̎ W, 31.xii.2000 – 3.i.2001, L. Masner, yellow pan trap, 13 ( OSUC 77439 ) . Río Sajalices , 8 ° 41 ̍ 20 ̎ N, 79 ° 51 ̍ 17 ̎ W, 22.i.2001, L. Masner, yellow pan trap, 13 ( OSUC 77440 ) .

COMMENTS: The only species of Curicta recorded from central Brazil by Keffer (1996) is C. granulosa De Carlo ; this must be a prime suspect to be a host of Thoron rivalis .

Thoron spinifer , new species

Figures 13, 14

DESCRIPTION: Length 2.1 mm. Apex of A1 well below top of vertex; male A11 2.4–2.6 times as long as wide; ocelli large, lateral ocellus separated from inner orbit by onehalf diameter of posterior ocellus; central portion of mesoscutum and scutellum at most with minute setigerous punctures; notaulus moderately long, but only reaching anterior margin of tegula, simple, without crenulae; mesoscutum with both long bristles and shorter underlying pilosity; metapleuron sparsely setose anteriorly, posterior portion of metapleuron and lateral face of propodeum nearly glabrous; marginalis not thickened, as wide as submarginal or basal portion of stigmal vein; postmarginal vein clearly developed, longer than stigmal vein; dorsellum with long, slender, spinelike needle medially (fig. 13); dorsal surface of propodeum not excavate; all coxae yellow; hindfemur partly to entirely dark brown; costae on T2 short, reaching only to middle of tergite (fig. 14); T2 as long as T3; T3 wider than long.

Female unknown.

DIAGNOSIS: Distinguished from other species of Thoron by the long and acute dorsellar spine and the short costae on T2.

ETYMOLOGY: From the Latin, spinifer , bearing a spine, referring to the elongate metanotal armature.

MATERIAL EXAMINED: Holotype male: ECUA­ DOR: Napo, Puerto Misahuallı´ , 250 m, 18– 22.ii.1983, M. Sharkey, OSUC 77477 ( CNC type no. 22866).

COMMENTS: The presence of the elongate metanotal spine in the male leads us to predict that female, when discovered, is unlikely to have T1 expanded into a basal horn or hump.

Figures

Figs. 2–8. 2, Thoron metallicus Haliday, lateral habitus; 3, T. metallicus, dorsal habitus; 4, T. metallicus, head of male with expanded genae; 5, T. metallicus, head of male with receding genae; 6, T. rivalis, n.sp., antennal clava; 7, T. garciai, n.sp., antennal clava; 8, T. longicornis Masner and Huggert, head and antenna, lateral view (from Masner and Huggert, 1979).

Figs. 9–14. 9, Thoron lautus (Masner), head, dorsal view; 10, T. metallicus Haliday, head, frontal view; 11, T. metallicus, female, lateral view of mesosoma and base of metasoma; 12, T. rivalis, n.sp., lateral habitus; 13, T. spinifer, n.sp., dorsellum, lateral view; 14, T. spinifer, T2, dorsolateral view. Scale bar in millimeters.