Casey — A Revision of the American Paederini. 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 which are 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. 

 Arizona ferrugineus n. 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 luridns n. 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 (Canon 

 City), — Mr. Wickham ochrinus n. 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 



