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 Lec. 
20 — Sinus at the tip of the sixth ventral in the male larger, about a fifth as 
wide as the segmental APeX..c.secccccescccensenesesecessseseveevesal 
Sinus extremely Minute... .... sce cccevercceccccceresseccseesccces sees sean 
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 eyes, 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). 
neglectum 0. 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; femaleasinneglectum. Length (contracted) 6.5 mm.; 
width 1.0mm. Michigan (Marquette).................innocens 0. 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 
