Cremastocheilus academicus

One of about forty-five species of myrmecophilous Cremastocheilus.

Key to Trinodia species
Median ridge of clypeus broad. Posterolateral angle of pronotum acute, strongly turned outward. Tarsi robust, 5-segmented.

Distribution
Mexico (Rio Linares)

Habitat
20 mil West Linares, Mexico. November 16, 1948.

Biology
Ant host unknown.

Description
Holotype (male). - Approximate length 9.5, width 4, height 3 mm. Black, opaque, pilosity brownish, short everywhere; most microsculptural units with a minute seta. Habitus elongate-deplanate, like other Trinodia species. Cephalic contours, fig.7. Clypeus with broad median ridge, clypeopleural crest broad; clypeopleuron broad, surface scabrous; clypeofrontal transition gradual; densely, finely punctate; punctures not distinctly annulate-striolate, their diameters ca. 0.3 of those of the pronotal disc; pilosity of head diminutive, except laterally on clypeopleural crest, where setae are abundant, with lengths mostly several times the diameter of the frontal punctures. Maximum width of head 2.2 mm. Pronotal contours, (see image); vertigial constriction not accented by declivous anteromedian part of pronotum; pronotal disc without midline impression; lateral cushion distinct, but feebly convex; posterior-internal depression distinct, but shallow; posterolateral protrusion sharp, its underside with small trichome (partly worn away); anterolateral groove with trichomes (partly worn away) between superior and inferior points; internal part of superior point protuberant. Pronotal disc annulate-striolate; striolae circular to slightly elongate-elliptic, many of them with a longer seta; striolae crowded laterally, almost sparse along apex and base; their densities ca. 25/0.25 sq.mm; lateral cushions with smaller, scattered, subannulate punctures, mostly separated by 2-4 times their diameters, many with a seta ca. twice as long as the punctural diameter; surface of posterolateral smooth, shiny. Median length of pronotum 2.0, maximum width 3.1 mm. Scutellum with 12 arcuate striolae. Elytral contours; elytral disc with sinuous and elongate-annulate striolae, many of them encompassing one or more minute punctures bearing a fine seta; some scattered speckles of whitish velutinous matter present; lateral and distal declivities of elytron with abundant fine punctures, nearly all bearing seta. Sutural length of elytra 4.2, maximum (longitudinal) length 5.7, maximum width combined 4.1 mm. Mentum; surface of backward extension virtually smooth, perimarginal wall well-developed. Antennal scapus dilated as usual, subtrangular, posterolateral angle rounded. Preposternal apophysis short. Lateral parts of pectus abundantly multistriolate (proepisternum) to arcuate-striolate (rest, inculding hind coxa). Metasternal disc with abundant fine punctures, nearly all bearing a minute seta. Abdomen medially impressed, with abundant, scattered, arcuate-striolate (laterally) to simple punctures (medially), nearly all bearing a minute seta. Ppygidium strongly convex, with abundant, scattered, simple punctures, nearly all bearing a minute seta; derm of pygidial apex shiny. Propygidial spiracles feebly protuberant. Fore tibia with 2 external denticles, spiniform apical-internal protrusion, and obtuse inferior-terminal angle; terminal spur long, tapering, just reaching tarsal segment 3.