Casey — A Revision of the American Paederini. 213 
longitudinally divided anteriorly by a tumid ridge and that the sinus at 
the apex is rather smaller and about twice as wide as deep. Length 
3.7 mm.; width 0.55 mm. Colorado (Salida),— Mr. Wickham. 
procera 0. sp. 
Form nearly similar to the preceding, slender, polished, black, the legs 
black with the tarsi pale; head narrow, elongate, the sides parallel for 
rather more than half the longitudinal distance from the eyes to the 
middle of the base, then semicircularly rounded, not subtruncate 
medially; prothorax about equal in width to the head, elongate, the 
sides subparallel, broadly arcuate, very obtusely subangulate at apical 
fourth; elytra parallel, evidently elongate, nearly one-half wider and a 
fourth longer than the prothorax, impressed on the suture behind the 
scutellum; legs rather slender. Male having a deep and elongate- 
oval impression occupying medianthird of the fifth ventral and 
extending virtually to the base, the posterior margin with a transverse 
emargination, the sides of which are formed by rather short obtuse pro- 
longations of the sides of the impression, the emargination not quite 
one-third as deep as the length of the impression before it, the posterior 
margin of the impression very feebly lobed and pubescent at the middle 
but without an acute subelevated process; sixth segment with a large 
simple apical sinus about three times as wide as deep, the surface 
before it apparently somewhat impressed. Length 3.4 mm.; width 0.55 
mm. Nevada (Ren0)....cesccecessce secs cececeeses ANGUStICEPS N. Sp. 
5— Body elongate, parallel, somewhat stouter than angusticeps, shining, 
black, the legs and antennae red-brown throughout; head well 
developed, rather wider just before the basal angles than across the 
eyes, the latter at nearly three times their own length from the base, 
which is broadly, transversely truncate, the angles moderately broadly 
rounded; prothorax elongate-oval, scarcely three-fourths as wide as 
the head, rapidly narrowed anteriorly as usual; elytra notably elongate, 
parallel, nearly one-half wider and a third longer than the prothorax, 
the punctures fine and scarcely at all asperate; abdomen subparallel, 
much narrower than the elytra and not quite as wide as the head, 
Male unknown. Length 3.9 mm.; with 0.63 mm. California (Mendo- 
CIO CO.) sc eeeescescereseeccceeceecesseceoees. soos tr tncaticeps Csy. 
The description of brunnipes, given above, is from some 
pencil notes taken by the author some years ago from the 
original type. It is a smaller and more slender species than 
the eastern puritana, the latter differing also in having the 
spiniform process of the fifth ventral broader, more triangular 
and pubescent, though having the same subterminal single 
lateral setae, and the sinuation of the sixth segment is smaller 
and rather more broadly rounded. The spiniform process in 
brunnipes, as well as the posterior part of the concavity, is 
completely glabrous. The Californian rotundiceps Csy., is sim- 
