•296 
GEO. H. HORN, M. D. 
are much more obtuse at apex than in that species, and the sutural 
angle rather better defined. 
llab. — Canada, New York and Illinois. The two supposed females 
are from Mt. Tom and Tyngshoro, Mass., and were collected by Mr. 
Blanchard, wlio separated them as not being fully in accord with 
normal females of otiosvs. 
\. aroiiufiis Say. — Moderately elongate, not more robust than ruficoUis ; 
head and thorax brassy, cupreous, or slightly greenish ; elytra varying from 
dark olivaceous to bright brassy or cupreous. AnteniiiB ])iceous, slightly bronzed, 
passing the middle of the thorax, seri-ate from the fourth joint ; front moderately 
impressed from the occiput nearly to the base of the clypeus; surface coarsely, 
moderately closely i)unctate, somewhat strigose on the occiput. Thorax one- 
fourth wider than long, not narrowed at base: sides regularly arcuate, the mar- 
gin slightly sinuous, disc convex, the median line with an anterior and posterior 
depression, an oblique depression at the side nearly reaching the median line; 
surface transversely sti igose, with punctures in the depre.ssions and more numer- 
ous near the apex, hind angles with an arcuate carina, rather sharp or obtuse 
'J, ; elytra slightly sinuate behind the humeri and dilated behind the middle, 
nearly concealing the abdomen, apices separately rounded, finely serrulate, disc 
slightly flattened at middle, basal depressions moderately deep, sutural ridge 
elevated behind the middle; surface rather densely imbricate, but not opaque; 
body beneath usually cupreous ; prosternal lobe broadly emarginate, the inter- 
coxal jtrocess gradually narrowed, acute at tij), proplenrpe scabrous, slightly stri- 
gose; metaste.ru um coarsely pnnctate-strigose. Abdomen moderately finely 
punctate, imu-e coarsely at tbe sides of the first two segments; pygidium coarsely 
punctate, not carinate. Length .20 — .36 inch. ; 5 — 9 mm. 
Male. — Front flatter and more nsnally greenisli, the impression 
less defined; prosternum closely itunctate and slightly pubescent; 
metasternum longitudinally impressed ; first ventral segment slightly 
flattened, not hairy ; anterior and middle tibite with a slight mucro 
at the inner apex, the posterior simple. 
Female. — Head more convex, the frontal impression dee|)er and 
sometimes bifurcate near the clypeus, color copj^ery or brassy ; pro- 
sternum more shining, less closely punctate, not hairy ; metasternum 
feebly impre.ssed ; abdomen simple ; tibio3 not mucronate. 
Variations. — 'fhe variations of this species are so pronounced that, 
with a limited series, three species might be indicated, as has in fact 
been done. The.se are as follows : 
Var. torquatus Lee. — Head and thorax brassy, or slightly coppery 
or greenish, elytra dark olivaceous. 
This form is widely distributed : Massachusetts, ^Michigan, Mon- 
tana, Illinois, Kansas, Kentucky, Pennsylvania. Thei'e is often a 
great resemldance between some of the smaller females of this and 
