Trichadenotecnum acutum Yoshizawa & Aldrete & Mockford 2008, SP. NOV.

TRICHADENOTECNUM ACUTUM SP. NOV.

Material examined: Holotype. Male. Mexico: 40 mi S Oaxaca City, 19.viii.1968, ELM (ISU). Paratypes. 2 males, same data as holotype (ISU).

Etymology: The specific epithet is taken from the Latin acutus (= sharp), indicating the narrow and pointed clunial arm of this species.

Description: Male. Head. White in ground colour; vertical and orbital markings brown; coronal suture black; frontal suture bordered with narrow pale brown band; frons with pair of pale brown bands at middle and with pair of brown spots laterally; gena white; eye black, IO/D = 1.1; ocelli white, ocellar field black; antennal socket bordered with narrow brown band; postclypeus with c. 10 rows of pale brown spots dorsally, fused with each other ventrally to form a large blackish brown marking, lateral margin of postclypeus brown, ventro-lateral corner without marking; anteclypeus brown. Antenna pale brown, pedicel and scape darker. Mouth parts pale brown; 4th segment of maxillary palpus brown.

Thorax. Prothorax brown. Mesonotum pale brown; anterior surface of scutum pale brown; anterior margin of lateral lobe of scutum black; scutellum brown, anterior margin darker; postnotum white. Metanotum brown, with white spot on posterior region of lateral lobe of scutum; anterior margin of scutellum darker. Mesopleuron white except dorsal third brown. Metapleuron brown except membranous region white.

Legs. Coxae and tarsi of all legs and hind femur brown; fore and middle femora pale brown with white part medially; tibiae pale with brown part near distal end.

Forewing (Fig. 17K). Spots in cell a 1 apparent, distal spot large. Opposing spots in cell r distinct but anterior spot less so. Proximal band narrow, broadly interrupted just beyond fork of M + Cu. Distal band narrow and faint. Spot on roof of cell m 3 distinct. Submarginal spots apparent; spot in cell r 5 larger; spots in cells r 1 and m 3 indistinct. Marginal clouds faint. Hindwing. Hyaline, cell CuP with group of faint brown spots in distal half; veins brown.

Abdomen. White, each segment with irregular brown band. Terminalia. Clunial arm (Fig. 34A) well sclerotized, apical part long and slender, forming free needle-like process, antero-ventrally with strongly sclerotized lobe covered with denticles. Eighth venter (Fig. 34C) with transversal sclerite, anterior margin rounded, posteriorly fused with hypandrium at middle. Epiproct lobe (Fig. 34B) wider than long, broadened dorsally, dorsal margin with conical process medially, posterior surface almost flattened. Paraproct (Fig. 34A): ventro-lateral band small, rectangular; distal process short. Hypandrium (Fig. 34C): left and right processes well developed, rising from postero-lateral corners, slightly curved, apices directed posteriorly; median tongue constricted medially, posterior margin with rounded notch medially, ventral surface smooth with few wrinkles, dorsal keel shallowly rounded. Phallosome (Fig. 34D): pseudoparameres widely separated, broad and short, wider than long, rounded apically. Phallobase narrowing to pointed anterior end.

Length. B 2.1–2.3; FW 3.0–3.1; HW 2.3–2.4.

Female. Unknown.

Distribution: Mexico.