1 76 MEMOIRS ON THE COLEOPTERA 



developed and prominent, the anterior superciliary fovea large and 

 the second antennal joint shorter than the third, as usual in the 

 subfamily. The integuments are smooth and polished, the hind 

 thoracic angles have a very short carina and the posterior trans- 

 verse impression is arcuate and sulciform laterally, generally inter- 

 rupted medially, where there may be one or sometimes three iso- 

 lated punctures. The mentum tooth is very short and obtusely 

 triangular. The elytra are notably smooth and convex, the discal 

 striae biabbreviated and one to three or four in number; the lateral 

 stria is very coarse, impressed and with setigerous foveae but widely 

 and completely interrupted submedially. The striae are very 

 smooth and devoid of any kind of punctuation, except as noted in 

 the table below. The anterior tarsi are subject to sexual modi- 

 fications somewhat as in Bembidion. The species are numerous 

 and but few have been described hitherto; as represented in my 

 cabinet they may be known as follows : 



Elytra each with a single stria, outside of which there may be sometimes 

 a second, which however is always excessively fine and only trace- 

 able under special angle of illumination 2 



Elytra each with two striae, the second feebler than the first and biabbre- 

 viated, but always distinct, impressed and easily observed 14 



Elytra each with several striae, some or all of which may be occasionally 



punctate 20 



2 Color pale flavo-testaceous throughout, the body notably narrow and 



elongate as a rule, stouter in mellita 3 



Color darker, the body more abbreviated 6 



3 Sutural stria attaining the base 4 



Sutural stria not attaining the base by a considerable distance 5 



4 Body oblong-oval, broader than in the three following, strongly con- 

 vex, very shining, uniform pale honey-yellow in color; legs flavate; 

 head small, scarcely two-thirds as wide as the prothorax, the sulci 

 very short, feeble; eyes moderate, prominent; antennae three-fifths 

 as long as the elytra, very slender basally, gradually somewhat in- 

 crassate distally, the sixth joint twice as long as wide, the first three 

 polished and only sparsely setose; prothorax two-fifths wider than 

 long, very much wider at base than at the truncate apex; sides mod- 

 erately rounded and reflexed, widest just before the middle, having 

 three punctures before the basal beading; foveae shallow; elytra 

 three-fifths longer than wide, gradually sharply ogival in apical 

 two-fifths, fully two-fifths wider than the prothorax; humeri broadly 

 and gradually rounded to the thoracic base. Length 2.2-2.7 mm.; 

 width 0.9-1.1 mm. Mexico (Tepehuanes, Durango), Wickham. 



*mellita n. sp. 

 Body smaller and much narrower, pale testaceous, polished; head two- 



