Casey — A Revision of the American Paederini. 89 



unimpressed. Length 7.5-9.0 mm.; width 1.15-1.25 mm. Massachu- 

 setts (Lowell), Rhode Island (Boston Neck — a slightly larger and more 

 vigorous variety), New York (near the city) and New Jersey. 



simile Lee. 



20 — Sinus at the tip of the sixth ventral in the male larger, about a fifth as 

 wide as the segmental apex 21 



Sinus extremely minute 22 



21 — Body larger and stouter, parallel, black and polished throughout, the 

 legs and antennae rufo-piceous; head rather well developed, the sides 

 parallel for half the distance behind the eyed, then broadly rounded 

 to the neck, becoming almost transverse just before attaining the 

 latter, the punctures rather coarse and sparse; antennae longer than in 

 the simile group, the obconic joints almost twice as long as wide; 

 prothorax oblong, parallel, only slightly elongate and but little wider 

 than the head, the angles well rounded, the punctures coarse, rather 

 sparse and confused; elytra slightly wider than the prothorax 

 and distinctly shorter, barely as long as wide, with the sides very 

 feebly diverging from base to apex in the male, subequal in length to 

 the prothorax, fully as long as wide and more parallel in the female, 

 the punctures coarse, uneven and sparse; abdomen as wide as the 

 elytra, minutely and relatively sparsely punctulate, polished. Male with 

 the fifth ventral unmodified, the sixth rectilinearly truncate at tip, with 

 the evenly rounded sinus wider than deep and a fifth as wide as the 

 apex, the surface not obviously impressed along the middle; female 

 with the sixth ventral broadly, obtusely rounded at tip. Length 

 (extended) 8.0 mm.; width 1.15 mm. Rhode Island (Boston Neck). 



neglectumn. sp. 



Body smaller and less stout, parallel, shining, black throughout, the legs 

 and antennae dusky testaceous; head as in neglectum, but more narrowly 

 ovoidal, the sides more gradually approaching the neck and not becom- 

 ing transverse, the punctures less coarse and still sparser and the 

 antennae somewhat shorter, the medial joints obviously less than twice 

 as long as wide; prothorax smaller, narrower and just visibly wider 

 than the head, the sides slightly converging from the less broadly 

 rounded anterior angles to the basal angles, the punctures equally 

 coarse and sparse; elytra obviously wider than the prothorax, sub- 

 parallel, a little longer than wide and about as long as the prothorax 

 in both sexes, the punctures coarse, uneven and only moderately 

 sparse; abdomen broad, fully as wide as the elytra, minutely and not 

 very closely punctulate. Male with the fifth ventral unmodified, the 

 sixth rectilinearly truncate at apex, with a rounded sinus, wider than 

 deep and about a fifth as wide as the apex, the surface narrowly and 

 distinctly impressed along the median line from before the middle to 

 the apical sinus; female as in neglectum. Length (contracted) 6.5 mm.; 

 width 1.0 mm. Michigan (Marquette) iiiiiocens n. sp. 



22 — Form relatively larger and more elongate, parallel, black and shining 

 throughout, the elytra sometimes piceous, the legs and antennae dusky 

 rufous; head and antennae nearly as in innocens but larger; prothorax 

 broad, only very slightly elongate, very much wider than the head, the 

 sides distinctly converging posteriorly from the arcuation at apical 



