Pristonesia Alencar & Azevedo, 2018

Azevedo, Celso O. & Colombo, Wesley D., 2022, Revision of Pristonesia (Hymenoptera, Bethylidae, Pristocerinae), an endemic Afrotropical genus, Zootaxa 5124 (3), pp. 321-340 : 322-323

Pristonesia Alencar & Azevedo, 2018

Diagnosis. Pristonesia is identifiable as a member of the Pristocerinae because the metanotum is developed medially and overlaps the mesoscutellum posteriorly. Among Pristocerinae , it is uniquely identified by having 1) median clypeal lobe large, and usually angulate; 2) hypopygium usually thick medially, 3) posterior hypopygeal margin from weakly emarginated to deeply excavated; 4) harpe with apical projections; 6) cuspis flattened and basally very wide; 7) apex of aedeagal dorsal valve with membranous bubble; 8) cat-whisker-shaped set of setae present on apex of aedeagus; 9) cupula reduced to dorsal-lateral area of the genital ring.

Description. MALE. Body elongate. Head. Antenna regularly long, never reaching metasoma; antennal rim regularly sized, about as long as wide and diverging anterad; pedicel always shorter than flagellomere I. Mandible just slightly wider apically than basally, teeth directed mesad. Clypeus with long median lobe, never less than 20% of total cephalic length, median carina complete and conspicuous, lateral lobe not delimited by any emargination, much shorter than median lobe. Palpal formula 6:3, palpi without long bristles, apical setae of each palpomere at most slightly longer than palpomeral length, three distal maxillary palpomeres shorter than precedent one. Eye prominent and large, occupying at least half length of head, with very few short setae, visible only under high magnification. Ocellar triangle not so prominent, ocelli protruding over vertex surface, at most 0.5 × as high as diameter of anterior ocellus. Occipital carina complete and conspicuous. Medioccipito-genal carina complete. Hypostomal carina strongly raised and complete.

Mesosoma . Pronotum usually carinate, surface mostly flat. Anteromesoscutum with notauli and parapsidal signums. Mesoscutum-scutellar suture contiguous medially. Mesoscutum-scutellar sulcus deep and wide. Metascutellum wider than long, setose, surface convex. Metapectal-propodeal complex with transverse anterior carina present, lateral carina usually absent, transverse posterior carina and posterior carina absent, propodeal spiracle crossing area of lateral carina of metapectal-propodeal complex. Propodeal declivity without median carina. Propodeal spiracle elliptical, crossing lateral carina of metapectal-propodeal complex anteriorly. Propleuron completely covered by pronotal flange when seen in dorsal view. Prepectus, anterior prepectal flange, posterior prepectal flange and epicnemial medial projection fully separated medially. Mesopleuron with oblique sulcus never conspicuous, sternaulus always indistinguishable. Forewing with poststigmal abscissa of R1 never longer than pterostigma; Rs&M inclined, its junction with Sc+R far from pterostigma about one third to half-length of pterostigma, 2r-rs&Rs vein much longer than pterostigma; flexion lines: medial flexion line bifurcating into anterior medial and posterior medial 1 flexions lines, r-m, m-cu always present. Hind wing with Sc+R vein at most as long as clavus; with two sets of basal and distal hamuli well separated, basal hamuli straight, distal hamuli hook-shaped. Claws with one or two teeth. Legs not spinose at all.

Metasoma. Metasomal segment I at least slightly longer than tergum II. Metasomal segments II and III lacking tergal process. Hypopygium with single plate, fully sclerotized and flat; anteromedial apodeme when present never long, anterolateral apodeme always present, median area of inner surface usually thick. Genitalia with simple harpe, although sometimes deeply excavated, inserted laterodorsally into gonostipes with distinct suture; gonostipes with basal area particularly developed mesad, covering part of base of aedeagus on ventral side; basivolsella fully fused to gonostipes, without vannus; digitus straight in its apical two thirds, not curved laterad apically, base varying from straight to strongly angled; cuspis uniramous, very wide basally, cross-section somewhat flattened; aedeagus with two valves, ventral valve always shorter and dorsal one, apical lobe of dorsal valve with apical membranous extension and conspicuous cat whisker-shaped set of setae on its lateral margin; apodeme with ergot and valvura; genital ring elliptical in anterior view, interrupted medially both on dorsal and ventral side, opening ventrad; cupula absent on ventral area of basal genitalia.

FEMALE: Unknown.