294 
GEO. H. HORN, M. D. 
present species the median line of the abdomen is very smooth, almost 
without punctures. In fact, the entire abdomen is less sculptured 
than usual. When once a male is obtained there will be no great 
difficulty in separating the female from otiosiis. 
It is evident that LeConte had before him a male of this species 
which he mistook for the male of laeu.st7'i.s, but I failed to find the 
specimen at present associated with that species, and discovered that 
it had been removed and placed with the present species either by 
himself, or later by Crotch. 
Hub . — Massachusetts (Blanchard); also near Philadelphia. 
A. criiiicoriiis n. sp.--Forra slender, as in otiosus, color olive-bronze with 
a slight bluish tinge at the sides, slightly shining. Antennse slender, bluish, 
passing the hind angles of the thorax, joints all longer than wide, serrate from 
the fourth joint, fimbriate on the posterior side with comparatively long, sparsely 
placed hairs; front rather fiat, a slight occipital depression, subopaque, sparsely 
punctate, occiput faintly strigose. Thorax wider than long, slightly narrowed 
at base, sides arcuate, margin slightly sinuous, hind angles not at all or very 
feebly carinate, disc moderately convex, a deep oblique lateral and two me<lian 
depressions as in otiosus; surface indistinctly transver.sely strigose on the disc 
with intervening punctures, at .sides in front punctate; scutellum transversely 
carinate ; elytra sinuate behind the hunjeri, slightly broadened behind the mid- 
dle, apices very obtuse, serrulate, disc with a vague costa, the intervening space 
slightly flattened, sutural edge elevated behind the middle, basal depressions 
moderate, surface closely imbricately sculptured, rougher near the base; body 
beneath more shining than above, blue; prosternal lobe obtuse, vaguely emar- 
giuate, the intercoxal pro<'ess gradually narrowed, acute at tip, propleurfe opaque, 
.scabrous; metasternum more roughly scabrous. Abdomen sparsely, finely punc- 
tate at middle, more coarsely at the sides ; pygidium coarsely punctate, not at all 
carinate; tarsi slender, claws similar 0 !i all the feet. Length .17 inch. ; 4.25 mm. 
Male . — Front snbopaque, alutaceous, sparsely ]mnctate ; pro.ster- 
num rather flat, opaque, sparsely punctate, not pubescent ; first two 
ventral segments rather flat, not grooved nor pubescent ; inner apical 
angle of the tibite spiniform and slightly incurved. 
While closely related to otiosus, the male gives evidence that the 
species is quite distinct. Females have not, with certainty, been 
separated, consequently it is not po.ssible to assert that the pilosity 
of the anteniue is peculiar to the male.* The anteniue are certainly 
longer and more slender than any species in the vicinity of otiosus. 
Hub . — Massachusetts (Blanchard), Pennsylvania (Liebeck), Illi- 
nois (Strumberg), Virginia (Ulke). 
■■■ Since the above was written females have been obtained having the antennae 
similarly pilose. 
