Trichapion sayi (Gyllenhal, 1833)
Family: Brentidae
Trichapion sayi image
Michael Shillingburg  
Description: Length, 1.88 to 2.44 mm.; width, 0.94 to 1.25 mm. Moderately robust. Black, elytra with more or less aeneous luster; pubescence white, fine, evident, coarser and more apparent on sides of prothorax, mesothorax, and metathorax. Male beak shorter than head and prothorax combined, one-third longer than prothorax, moderately, evenly curved; in lateral view stout and parallel at base, attenuate to apical third, thence parallel-sided to apex; in dorsal view stout and parallel at base, not expanded laterally at antennal insertion, attenuate to apical third, slightly expanded toward tip; punctured and pubescent in basal two-thirds, apical third glabrous, smooth, shining. Female beak generally longer than head and prothorax combined, ranges from one-half to two-thirds longer than prothorax, moderately strongly, evenly curved; in lateral view apical half nearly parallel-sided; in dorsal view stout and parallel at base, attenuate to apical third, distinctly expanded to tip; dull and alutaceous throughout, basal half punctured, more or less sparsely pubescent, apical third smoother, more shining. Antennae inserted at distance from eye less than width of frons, of male at basal fifth of beak, of female at basal seventh; first segment equals next two, second segment shorter than next two; club of male 0.18 by 0.09 mm.; of female 0.20 by 0.08 mm. Eyes prominent; frons much wider than dorsal tip of beak, with shallow median furrow and two lateral rows of punctures. Prothorax at base one-fourth wider than long, middle narrower than base, apex ranges from 0.67 to 0.70 as wide as base; sides beyond basal lateral expansion nearly parallel to middle, rounded to strongly constricted apex; in profile dorsal surface slightly arcuate; punctation moderately deep, 0.03 mm. in diameter, interspaces about one-half diameter of punctures; basal fovea moderately deep, short. Elytra at humeri two-fifths wider than prothorax at base, 2.8 times as long as prothorax, length to width ranges from 10 : 7 to 11 :8.5; intervals nearly flat, twice as wide as striae, rather smooth and polished, with two rows of fine punctures; striae moderately deep, fine. Scutellum triangular, 0.08 by 0.06 mm. Front femora about 3.5 times as long as wide. Claws with acute basal tooth.

Special male characters: Tibiae 2 and 3 armed with small, simple mucrones, tibia 1 slightly flattened for about one-third its length on anterior inner surface, area devoid of scales and at most slightly striate.

The National Science Foundation
This project made possible by National Science Foundation Award EF 1207371
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