Casey — A Revision of the American Paederini. 177 



rounded, the base truncate, becoming feebly sinuate in median third, 

 the eyes at between three and four times their length from the base; 

 antennae rather slender, filiform, with the joints elongate, about three- 

 fourths longer than the head ; prothorax strongly obtrapezoidal, slightly 

 wider than long, only just visibly narrower than the head, the sides 

 broadly and evenly arcuate, the angles obtuse but not much rounded; 

 elytra very slightly longer than wide, just visibly narrower than the 

 prothorax but rather distinctly longer, the sides subparallel and broadly, 

 feebly arcuate, broadly rounding into the base; abdomen widest at the 

 middle where it is as wide as the head and slightly wider than the elytra, 

 the sides broadly and evenly arcuate. Length 4.3 mm. ; width 0.68 mm. 

 New Mexico aintacea n. sp. 



The gular sutures are moderately widely separated, grad- 

 ually and urcuately converging posteriorly and most narrowly 

 separated basally; they are notably and very broadly im- 

 pressed. The single type is a female and has lost all its legs. 



Oxymedon n. gen. 



In general facies the single known representative of this 

 genus departs widely from Medonodonta, differing in form, 

 convexity and sculpture to a notable degree, as well as in the 

 much more approximate and scarcely at all impressed gular 

 sutures. It may be described as follows : — 



Body rather stout, parallel and convex, strongly shining, the punctures of 

 the head not very coarse but strong and well separated, those of the pro- 

 thorax scarcely smaller but notably feebler and rather less close -set, 

 those of the elytra somewhat coarse and very strong, nearly like those 

 of the head but sparser; color bright and uniform pale testaceous 

 throughout, the head sometimes feebly picescent; head almost as long as 

 wide, parallel and nearly straight at the sides, the angles broadly 

 rounded, the eyes at a little less than three times their own length from 

 the base, the latter becoming gradually transversely truncate toward 

 the middle ; antennae moderately slender and notably elongate, as long 

 as tHfe head and prothorax together, scarcely perceptibly and very grad- 

 ually enlarged distally ; prothorax slightly narrower than the head, as 

 long as wide, the sides subparallel or just visibly convergent from apex 

 to base and broadly arcuate, the angles all broadly rounded; elytra 

 quadrate, parallel, and feebly arcuate at the sides, a fifth wider and one- 

 third longer than the prothorax, rather wider than the head; abdomen 

 parallel with the sides straight, not quite as wide as the head. Length 

 4.8 mm.; width 0.85 mm. California (Sisson andTruckee), — Mr, Wick- 

 ham rabram n. sp. 



The male sexual characters are nearly as in the California 

 species of Medon^ the fifth segment being unmodified and the 



