808 
GEO. H. HORN, I\r. T). 
sides arcuate, lateral margin sinuate, hind angles not at all, or only %’ery obtusely 
carinate ; disc convex, with a vague median depression divided at middle, usually 
on each side a fovea, lateral depression well marked; surface transversely stri- 
gose, but not coarsely, with finer punctures in the intervals; scutellum trans- 
versely carinate; elytra sinuate behind the humeri, slightly broadened behind 
the middle, apices suhacutely rounded, serrulate, disc flattened at middle, some- 
times with a vague costa, basal fovea moderate, suture elevated behind the mid- 
dle, surface densely imhri cate-granulate ; body beneath more shining than above ; 
prostenial lobe snhtruucate, vaguely emarginate, intercoxal j)rocess broad, nearly 
])arallel, acute at tip, vaguely impressed longitudinally, propleurse densely punc- 
tate and rather densely clothed with whitish pubescence, sides of metasternum, 
metapleuraj and outer side of coxal plates densely punctate and with whitish 
pubescence. Abdomen moderately closely punctate, at sides of first ventral 
strigose, last segment oval at tip, vertical portion of the ventral segments densely 
clothed with whitish pubescence, except sometimes on the second segment; py- 
gidium coarsely punctate, the median carina prolonged at apex ; claws variable 
on the feet. Length .32 — .40 inch.; 8 — 10 mm. 
Male. — Front less irregular, the median impression well defined, 
but with feeble traces of oblique depressions; anterior and middle 
tibite feebly mucronate, posterior tibiae simple ; claws of anterior and 
middle tarsi cleft very near the apex, nearly bifid, posterior claws 
acutely cleft, but less close to apex ; first ventral segment convex at 
middle, the second with a deep, smooth, abruptly formed groove ex- 
tending from the finst suture more than half to the second. 
Female. — Front more irregular, the median groove less sharply 
defined, the oblique depressions more evident ; tibiae not mucronate ; 
claws similar on all the feet, cleft behind the apex, forming an acute 
tooth. Ventral segments convex at middle, not grooved. 
Variaiiona. — Two well marked varieties may be indicated based 
on color, between which there are, however, distinct intermediates. 
Var. acutipennis Mann. — Color deep blue, becoming blue-black in 
one direction, or slightly olivaceous in the other. 
This form is usual in the more southern regions, although my 
darkest specimen is from Massachusetts, as well as that intermediate 
between the blue form and the next variety. 
Var. . — Color olivaceous, the thorax somewhat brassy. 
This variety seems confined to the more northern regions of the 
country ; in fact, all I have seen are from Massachusetts. 
Habits. — j\Ir. Blanchard states that he has taken the acutipennis 
form on the foliage of Oak shrubs, the other on foliage of Poplar 
si)routs. These observations do not give any positive indication of 
the wood into which they bore. 
