Casey — A Revision of the American Paederini. 229 



know at present but one species which may be described as 

 follows from the male : — 



Elongate, rather slender, parallel, only moderately convex, dark red-brown 

 in color throughout the body and antennae, the legs slightly paler; lus- 

 tre dull, the elytra feebly shining; head rather longer than wide, the 

 posterior half almost evenly semicircular in form, the eyes rather small, 

 only slightly prominent and at about three times their length from the 

 base measured longitudinally; antennae scarcely one-half longer than 

 the head, somewhat thick, distinctly incrassate distally; punctures 

 feebly granuliform and close-set above, obsolete and very sparse on the 

 flat under surface; prothorax very densely punctured like the head but 

 rather more finely and strongly, the median impunctate line very fine 

 and scarcely entire, scarcely visibly longer than wide, three-fourths as 

 wide as the head, oblong in form, the sides obtusely angulate androunded 

 at apical fourth, thence just visibly converging and straight to the 

 broadly rounded basal angles and rapidly converging and feebly sinu- 

 ate anteriorly to the narrow neck, which is less than half as wide as 

 the broad truncate basal margin; elytra quadrate, parallel, fully as long 

 as wide, rather wider than the head and about a third wider and longer 

 than the prothorax, the punctures strongly and granularly asperate but 

 less dense than those of the prothorax; abdomen parallel with the sides 

 feebly arcuate, distinctly narrower than the elytra, very minutely, 

 densely, subasperately punctulate. Male with the fifth ventral almost 

 completely unmodified, the sixth with a very large and deep emargina- 

 tion, two-fifths as wide as the segment and somewhat wider than deep, 

 the notch transversely and feebly rounded at the bottom, with its sides 

 becoming almost parallel posteriorly. Length 5.7 mm. ; width 0.95 mm. 

 District of Columbia '. tristis Melsh. 



This species does not seem to be at all abundant and most 

 of the known examples were taken by Mr. Ulke. 



Omostiliciis n. gen. 



This genus is also represented at present by a single species, 

 the largest of the subtribe known to me. It departs strik- 

 ingly from StilicoUna in its much larger head, very small eyes, 

 form of the gular sutures, for the greater part non-carinate 

 prosternum and structure of the labrum, but resembles it very 

 much in sculpture, coloration and sexual characters. In both 

 these genera the anterior tarsi are virtually undilated, even in 

 the male, and are clothed beneath more or less sparsely with 

 short stiff brown hairs, contrasting greatly with the dense 



