Orthocentrus brevicornis, Humala, 2019

Orthocentrus brevicornis sp. nov.

( Figs 4 D View FIGURE 4 , 10 D View FIGURE 10 , 14 A View FIGURE 14 , 17 A View FIGURE 17 , 25 View FIGURE 25 )

Material examined. Holotype ♀: México, Hidalgo, Huasca de Ocampo , rancho Sta.Elena, MT3, 25.XI–26.XII.2005, leg. A. Contreras et al. ( UNAM).

Description. Female. Fore wing length 4.0 mm.

Face medially 1.3 × as wide as high; smooth and polished, with shallow, sparse punctures, eyes not setose, dorsal ridge of face inbetween antennal sockets without a prominence; orbits divergent ventrally; face profile slightly rounded, edge of clypeus rounded, slightly impressed, antennal sockets not on a distinct high shelf (Hw/Fp = 9.4); subocular sulcus distinct, sharp, strongly bent towards occiput; maxillary palp reaching slightly beyond fore coxa. In dorsal view, head posteriorly moderately concave, temples distinct, protruding posterior to eye, about 1/3 of eye width, hind ocellus separated from eye by 0.9 × ocellar diameter, anterior ocellus separated from eye by 2.0 × ocellar diameter, ocellar-ocular grooves present. Minimum distance between antennal sockets slightly less than diameter of socket; antenna comparatively short, with 23 flagellomeres, which gradually slightly shortening towards apex of antenna; basal flagellomere about 2.0 × as long as apically wide and basal flagellomere about half of the length of scape; scape with internal surface slightly convex.

Mesosoma polished except for inconspicuous punctation on anterior of mesoscutum and pronotum with short weak striae postero-ventrally; sometimes with vague, coriaceous microsculpture on propodeum; mesoscutum anteriorly with distinct notauli; in profile, scutellum moderately high, metapleuron slightly convex; propodeum with posterior transverse carina complete, raised as distinct projections at level of lateral longitudinal carinae; median longitudinal carinae complete, lateral longitudinal carinae complete, spiracles medium-sized.

Legs moderately broad; coxae and femora polished, femora with inconspicuous alutaceous-coriaceous sculpture, tibiae and tarsi coriaceous-granulate; hind coxa 1.1 × as long as first tergite, hind femur 3.2 × as long as high, hind tibia 3.9 × as long as apically wide; tibiae with spine-like setae.

Wings not particularly narrow; fore wing without areolet, vein Rs slightly upcurved basally; hind wing with nervellus intercepted at lower third.

First tergite elongate, 1.4 × as long as apically wide, in dorsal view, slightly widened at spiracles; coriaceous, with indistinct median longitudinal carinae, with transverse impressions originating at about middle of tergite, sloping posteriorly, not meeting centrally. Second tergite 0.9 × as long as apically wide; coriaceous, with irregular longitudinal striae in basal third, with diagonal-transverse impressions originating at about middle of tergite, sloping posteriorly, not meeting centrally; basal thyridia nearly rectangular, contrastingly coloured, second thyridia not developed. Remainder of metasoma impunctate except third tergite smoothly coriaceous in basal third, with irregular striae, without thyridia. Ovipositor not visible; ovipositor sheath pointed, with sparse, long setae.

Body largely setose except eyes, pronotum, mesopleuron and metapleuron, setae scattered on metasoma and posterior coxae.

Dark to blackish brown except face medially—brown; clypeus, base of antenna ventrally yellow, inner orbits to ocelli level, malar space, mouthparts, tegula, subalar prominence, fore and mid coxae, trochanters, trochantelli and sternites yellowish creamy; propleuron, pronotum dorsoposteriorly, mesepimeron dorsally, apical margins of first second and third tergites and fore and mid legs largely yellow to light brown; hind legs rufous, with blurred marks on hind coxa dorsoapically, hind femur apically, and hind tarsus brown; subbasal ring of hind tibia—yellowish. Metasoma from third tergite brown.

Male. Unknown.

Biology. Hosts unknown.

Distribution. Mexico ( Hidalgo).

Etymology. Named after the comparatively short antennae.

Comments. Compared with the other species that have a complete posterior transverse carina, short notauli, and open areolet, subocular sulcus strongly bent towards the occiput, unlike in O. coronadoae , O. rufipleuris , O. similis and O. varicolor . Similar to O.latus , O. luteoclypeus and O. maculae but differs in the hind coxa mostly rufous and other details of the colour pattern.