NORTH AMKRrCAN COLKOPTKKA. 
291 
disc moderately convex, without trace of costa; surface densely granulate, but 
less opaque than in ruficolUs ; body beneath piceous with teneous lustre; proster- 
nal lobe slightly eniarginate, the intercoxal process gradually narrowed, the tips 
acute; pro- and nietapleurae closely punctate, not pubescent; abdomen moder- 
ately closely punctate, more finely along the middle, niore coarsely and roughly 
at the side of the first segment ; pygidium coarsely punctate, carinate, the carina 
ju'ojecting at tip; claws similar on all the feet in both sexes, the lower portion 
of the cleft more nearly contiguous in the female. Length .25 — .28 inch.; 6.25 
— 7 mm. 
Male. — Pmsteriumi coarsely, not closely punctate, without jtubes- 
cence ; first ventral segment slightly depressed along the middle, 
second with a deep, smooth groove extending more than half its 
length. 
Feiaale. — Prosternum less punctate, smoother ; first two ventral 
segments simple. 
Four specimens have afforded the above description. Another 
specimen in Mr. Ulke’s collection is of somewhat larger size, and 
with more even thorax, seems to belong here, although the discovery 
of the male may prove it distinct. 
This species greatly resembles ruficolUs, but may be distinguished 
by the less deeply impressed head and the presence of either a slight 
evidence, or a distinct carina, in the hind angles of the thorax. The 
sexual characters of the two are practically identical ; several other 
species have also some resemblance, but these have no pygidial spine. 
HabiU — The wood in which the larva lives is not known, but the 
imago has been taken on foliage of Poplar sprouts (Blanch. Ent. 
Am. V, p. o2, under the name auxins). 
Hab. — Massachusetts (Blanchard), New Jersey (Liebeck), New 
Mexico (Ulke), Illinois (Dury), Missouri (Say). 
.4. otioKiis Say. — Form slender, sometimes linear in the male, stouter in the 
female, usually dull greenish, sometimes slightly cupreous. Antennae usually 
bluish, extending nearly to the hind angles of the thorax, a little shorter in the 
female, joints all longer than wide, serrate from the fourth joint; head viewed 
from above slightly convex, with a very slight occipital impression, front rather 
flat, coarsely and closely punctate, occiput faintly strigose. Thorax a little wider 
than long, slightly narrowed at base in the male, sides feebly arcuate, but more 
distinctly in the female, lateral edge straight , or feebly sinuous hind an- 
gles obtusely or indistinctly carinate , or usually with a well defined carina 9 , 
disc convex, an oblique lateral depression and on the median line two depres- 
sions, the posterior the larger; surface transversely strigose, with fine punctures 
between; scutellum transversely carinate; elytra slightly sinuate behind the 
middle, entii-ely concealing the abdomen from above, apices separately rounded, 
finely serrulate, elytra with a vague costa from the humeri behind the middle, 
between which the elytra are slightly flattened, and behind the middle the su- 
