228 Trans. Acad. Sci. of St. Louis. 



Form moderately convex, the hind body very broad, brownish-rufous 

 throughout, the legs and antennae concolorus, the head and abdomen 

 blackish; surface of the head above and beneath and of the pronotum 

 impunctate but densely and very strongly micro-reticulate, the stiff 

 short setae moderately close-set, of the elytra and abdomen rather 

 more shining, the former less strongly reticulate, somewhat rugulose 

 but not distinctly punctate, the setae very thick and moderately close- 

 set, the latter rather densely clothed with very fine short and decum- 

 bent hairs of the usual type; head rather longer than wide, the base 

 feebly lobed in the middle, the eyes small, not prominent, at fully three 

 times their length from the base measured longitudinally; antennae 

 short, moderately thick, about as long as the head, feebly incrassate, 

 the joints rather closely united; prothorax slightly longer than wide, 

 three-fourths as wide as the head, strongly rounded laterally at apical 

 third, the sides thence moderately converging and nearly straight to 

 the base and more strongly converging to the apex, the latter about half 

 as wide as the base; surface with a narrow and less opaque median 

 line; eljtra one -fifth wider than loDg, nearly one-half wider than the 

 head, three-fourths to four-fifths wider than the prothorax and fully a 

 third longer, the sides feebly diverging from the base and broadly, feebly 

 arcuate; abdomen short and broad, less than one-half longer than the 

 elytra, at base fully as wide as the latter, and, at the middle, a little 

 wider. Male with the fifth ventral unmodified, the sixth with a very 

 large simple parabolic sinus, about half as wide as the segment and 

 between two and three times as wide as deep. Length 5.0 mm. ; width 

 1.45 mm. Massachusetts (Dracut;, — Mr. Blanchard..formicarius Csy. 



Although the body has a very stout form, nearly as in 

 Pachystilicus, it probably has little or no phylogenetic rela- 

 tionship with that genus, as the head, labrum, palpi, sculpture 

 and vestiture are of wholly different types. There is but little 

 difference between the male and female, the former having 

 the head and prothorax very slightly narrower when compared 

 with the hind body. 



Stilicolina n. gen. 



In the peculiar opaque surface and very fine subgranulif orm 

 punctuation, this genus resembles Omostilicus and the remark- 

 ably fine and obsolete sculpture of Eustilicus, mentioned by 

 Sharp, is probably similar. This type of sculpture is wholly 

 dissimilar from that prevailing in Stilicus. In the very sharply 

 elevated and entire prosternal carina and structure of the 

 labrum, Stilicolina is wholly different from Omostilicus. We 



