NORTH AMERICAN COEEOPTERA. 
295 
A. iiiasciiliiiU!^ 11 . sp. — Form rather slender, but more robust than otiosvs, 
color dull green or slightly brassy, feebly shining. Antennre greenish, serrate 
from the fourth joint, these longer than wide, tip reaching the hind angles of 
the thorax; head slightly convex, a very feeble occipital impression, more dis- 
tinct in the female, front densely punctate, occiput slightly strigose. Thorax 
wider than long, slightty narrowed at base, sides in front arcuate, a slight sinua- 
tion posteriorly, lateral margin sinuate, hind angles with a sharply defined carina 
in both sexes, disc convex ; an oblique, but not deep impression at the sides, two 
depressions on the median line as in otiosus, but much less distinct; surface not 
coarsely transversely strigose, with fine punctures on the intervals; scutellum 
transversely carinate ; elytra slightly sinuate behind the humeri, then somewhat 
dilated, concealing the abdomen, apices rather obtusely rounded, finely serrulate, 
disc with a vague costa on each side, the intervening space rather flat, sutural 
margin elevated behind the middle, basal depressions shallow, surface closely 
imbricately sculptured; body beneath more .shining than above ; prosternal lobe 
obtuse, broadly and rather deeply emarginate, the intercoxal process gradually 
narrowed, acute »t tip, propleurse closely punctate ; metasternum at sides densely 
submuricately sculptured. Abdomen closely punctate, and on the first two seg- 
ments denser and submuricate ; pygidium sparsely punctate, indistinctly carinate ; 
hind tarsi slender, as long as the tibiae, the first joint as long as the four fol- 
lowing ; claws similar on all the feet in both sexes. Length .24 inch. ; 6 mm. 
Male. — Front flatter, more opaque and more densely punctured, 
usually greenish ; prosternum with a space in front densely covered 
with short erect pubescence, the intercoxal jirocess smoother, with a 
median longitudinal elevation. First two ventral segments flattened, 
or vaguely concave along the median line, not pubescent. Inner 
apical angle of the front and middle tibiae spiniform and incurved, 
posterior tibiae simple. 
Female. — Front more convex, more coarsely and less densely jiunc- 
tate, usually brassy ; prosternum not hairy, the intercoxal process 
flat. Abdomen not impressed, and less roughly sculptured. 
Of the habits of this species I have no information. The four 
specimens examined show no variation beyond that given in the 
detailed description. 
It is highly probable that this species is mixed with otiosus in those 
collections possessing it. In fact, so great is the superficial resem- 
blance that with ordinary compaiTson they could not be separated. 
The males are, however, easily separated by the pubescent area at 
the front of the prosternum. The median subcariniform elevation 
of the intercoxal process bifurcates about the middle of the sternum 
like a broad letter Y, and in the bifurcation behind the emargina- 
tion of the lobe the jnibescent area is placed. The females, if I have 
correctly separated them, are not so easily distinguished from the 
larger females of otiosus, Imt I observe that in both sexes the elytra 
