Casey — A Revision of the American Paederini. 163 



but strong, close-set, the interspaces more polished and less dull or 

 minutely reticulated than in lepidum; prothorax more finely and a 

 little less closely punctured, obtrapezoidal with the sides straight, 

 wider than long and distinctly narrower than the head, the angles 

 rounded; elytra quadrate, somewhat wider and distinctly longer than 

 the prothorax, subequal in width to the head ; under surface of the latter 

 convex, finely, rather sparsely punctate, the double gular suture toward 

 base only feebly impressed. Sinus of the sixth ventral a little larger 

 and relatively broader than in lepidum, broadly rounded. Length 4.4 

 mm. ; width 0.8 mm. California (Lake Tahoe) lacustre n. sp. 



6 — Head very large, much wider than the elytra, fully as long as wide, 



finely, strongly and closely punctate, the sides behind the eyes feebly 

 arcuate to the rounded basal angles, the width just before the latter 

 a little greater than across the very small and anterior eyes; prothorax 

 well developed, much narrower than the head, distinctly wider than 

 long, obtrapezoidal with the sides nearly straight, the angles rounded, 

 the punctures finer and much sparser than those of the head; elytra 

 notably small, not as long as wide, scarcely visibly wider and only very 

 little longer than the prothorax, about four-fifths as wide as the head, 

 distinctly wider at apex than at base ; under surface of the head shin- 

 ing, finely, more sparsely punctate; gular sutures very approximate, con- 

 verging to the base and well impressed. Notch of the sixth ventral of 

 the usual form in circular arc; fifth segment with some stiff black 

 bristles arranged transversely on the disk near the apex, the single 

 series rather widely interrupted at the middle, the apical margin trun- 

 cate, just visibly sinuate at the middle. Length 3.9 mm.; width 0.68 



mm. California (Sonoma and San Mateo Cos.) convergens Csy. 



Head large but smaller than in convergens and only slightly wider than the 

 elytra; body black or piceous-black throughout, the legs and antennae 

 rufous 7 



7 — Prothorax as in convergens, distinctly wider than long, obtrapezoidal in 



form with the sides straight and the angles only moderately rounded; 

 head rather wider than long, moderately inflated and broadly arcuate at 

 the sides behind the very small eyes, distinctly wider before the broadly 

 rounded basal angles than across the eyes; elytra not quite as long as 

 wide, a little wider at apex than at base, distinctly wider and longer 

 than the prothorax but obviously narrower than the head; under surface 

 of the latter finely, sparsely punctate, the gular sutures impressed, 

 converging very gradually and very approximate. Sexual characters of 

 the venter nearly as in convergens, the notch of the sixth segment cir- 

 cularly rounded, not quite half as wide as the segmental apex and about 

 three times as wide as deep. Length 4.2 mm.; width 0.72 mm. Van- 

 couver Island (Victoria), — Mr. Wickham iusulare n. sp. 



Prothorax much narrower, only just visibly wider than long, with the angles 

 broadly rounded and the sides but feebly converging from apex to 

 base, both the head and prothorax minutely and unusually strongly 

 reticulated and dull, the former finely and feebly but closely, the latter 

 more finely and less closely, punctate ; head narrower, as long as wide, 

 not inflated basally, the long sides behind the eyes parallel and almost 

 straight, the angles moderately broadly rounded; elytra about as long 



