Casey — A Revision of the American Paederint. 193 
prothorax, rather slender but distinctly incrassate distally, the basal 
joint unusually elongate, nearly as long as the next three which dimin- 
ish gradually in length; prothorax four-fifths as wide as the head, 
slightly longer than wide, the sides feebly converging from the obtuse 
and slightly rounded angles at apical fifth to the less obtuse and slightly 
rounded basal angles and straight, the punctures sparse and rather 
feeble but much larger than those of the head; elytra slightly longer 
than wide, distinctly wider than the head, a third wider and one-fourth 
longer than the prothorax, the sides very feebly diverging from the base, 
the punctures very fine and not close-set; abdomen but slightly nar- 
rower than the elytra, but little wider posteriorly than at base; gular 
sutures well separated, the intervening space with a small feeble 
impressed fovea just behind the mental support. Male with a deep 
elongate-oval excavation occupying median fourth of the fifth ventral, 
and having sharply defined side margins, extending to basal third or 
fourth, the excavation gradually narrowing and becoming obsolete near 
the base; bottom of the excavation flat and polished; posterior margin 
with a deep subquadrate notch, the sides of whichare formed by obtuse 
prolongations of the sides of the excavation; sixth segment having a 
very deep and extremely narrow apical notch, acute at the bottom and 
three or four times as deep as wide. Length 3.3 mm.; width 0.7 mm, 
ATIBOND. 6 oces cccncs sescccscevcscces cocccs cess cove hOFTUSINONS D. Sp. 
Form and coloration nearly similar to the preceding, the body narrower and 
the head and prothorax relatively smaller; head notably longer than 
wide, the eyes smaller than in ferrugineus but otherwise similar, the 
antennae more strongly incrassate distally; prothorax distinctly elon- 
gate, with the sides parallel, the anterior angles behind apical fifth and 
rather broadly rounded; elytra a third wider and longer than the pro- 
thorax, longer than wide; gular sutures well separated, the intermediate 
surface simple but more strongly micro-reticulate. Length 3.0 mm.; 
width 0.62 mm. Southern California...................-JUridus 0. sp. 
Form and coloration similar in general to the two preceding but with the 
prothorax relatively more developed and but just visibly narrower than 
the head, parallel at the sides, with the anterior and basal angles well 
rounded, the former at about apical fifth; sides of the head behind the 
well developed eyes more rapidly converging and broadly arcuate, the 
truncate base much narrower than the width across the eyes; antennae 
only very feebly incrassate; elytra but little longer than wide, slightly 
wider than than the head, a fourth wider and one-fifth longer than the 
prothorax. Length 3.4 mm.; width 0.65 mm. Colorado (Cafion 
City), — Mr. Wickham.........sescesceseecceeceeeeees OCHFiNUS D. SP. 
3 — Body parallel, rather darker testaceous, the abdomen somewhat dusky; 
lustre rather shining; head well developed, scarcely at all longer than 
wide, fully as wide as the elytra, the sides behind the somewhat 
smaller eyes parallel for a short distance, then broadly rounding to the 
truncate base; prothorax small, much narrower that the head, slightly 
elongate, the sides rather strongly converging from the well rounded 
angles at apical fifth to the rounded basal angles and straight; elytra 
obviously wider than the prothorax but only just visibly longer; abdo- 
men at base as wide as the elytra, becoming wider behind. Male having 
