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 tothe 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 0.8mm. 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 wellimpressed. 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 
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7 — Prothorax as in souelanans: 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 0.72mm. Van- 
couver Island (Victoria), Mr. Wickham............-. insulare 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 
