1!)<S AMERICAN COLEOPTERA 



reflexed and not translucent. Elytra rounded at tip, with the re- 

 curved portion of the sutural stria nearly parallel to the margin ; 

 marginal stria entire, less deep at middle, deepest towards the apex ; 

 dorsal punctures two, the first situated on the fourth stria near the 

 base, the second on the third stria near the apex. 



In the males the first two joints of the anterior tarsi are distinctly 

 dilated, with the inner apical angles prolonged. 



This group is nearly the equivalent of Tachyta Kirby, and seems 

 to lead towards Trechvs of the Pogonini. It differs notably from 

 the others of the genus by the arrangement of the dorsal punctures 

 of the elytra. The third joint of the antennae is distinctly longer 

 than the second, the two being subequal in most species of Tachys. 



Hut two species occur in our fauna. Both are black and resem- 

 ble each other quite closely. They may thus be separated : 



Elongate, depressed; thorax about one-half wider than long, not wider at base 

 than apex, hind angles not or but feebly earinate ; elytra subparallel. 

 Length .09 .12 inch nanus Gyll. 



Broader, slightly convex; thorax nearly twice as wide as long, wider at base 

 than apex; hind angles earinate; elytra more oval. Length .10-. 12 

 inch I al I i n. sp. 



2. T. nanus Gyll. (PI. VI, fig. 2). — Form elongate, more or less depressed. 

 Color black, sometimes tinged with brownish, shining. Surface more or less 

 finely alutaceous. Head as wide as the thorax at apex ; frontal grooves distinct, 

 extending backwards as far as the middle of the eye; eyes moderately large and 

 prominent; antennae less than one-half the length of the body, piceous. the 

 basal joints more or less rufous; palpi piceous. Prothorax subquadrate, about 

 one-half wider than long, as wide at base as apex ; apex very feebly emarginate ; 

 anterior transverse impression feeble or nearly obsolete; median line distinct, 

 abbreviated before and behind; posterior transverse impression distinct; basal 

 impressions moderately deep; base truncate; sides rounded in front, slightly 

 sinuate behind ; hind angles rectangular, not, or very feebly, earinate. Elytra 

 oblong-ovate, subparallel, slightly wider than the thorax, finely striate, with 

 usually the four or five inner striae distinct; striae impuuetate, all but the sutural 

 abbreviated behind; dorsal punctures small, the first on the fourth stria about 

 one-fifth from base, the second on the third stria about one-fifth from apex; 

 intervals flat or nearly so. Body beneath black or dark piceous. Legs piceous 

 or nearly black, the. tibia? and tarsi often somewhat tinged with rufous. Length 

 .09-.12 inch ; 2.25-3 mm. 



One of our best known and most abundant species. It is subject 

 to some variation. The striae of the elytra vary from moderately 

 distinct to nearly obsolete. The thorax is usually about one-halt' 

 wider than long, rarely somewhat wider, while the hind angles, 

 although usually not earinate, are occasionally feebly so. 



