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....... dL Waidie oe cebu capper enenk make Enews alutacea n. sp. 
The gular sutures are moderately widely separated, grad- 
ually and arcuately 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 the 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.; width0.85mm,. California (Sisson and Truckee),— Mr. Wick- 
TAM occ cece rcee sees cece vececccsccescccc recs socecceses SUDIUM ND. Sp. 
The male sexual characters are nearly as in the California 
species of Medon, the fifth segment being unmodified and the 
