NORTH AMKKICAN COLEOPTEKA. 
30J) 
While I have united the two forms with some reluctance I will 
admit that I have been unable to find any structural character sepa- 
rating them. The extremes are quite distinct in color, but the inter- 
mediates form a complete union. 
Hah . — Massachusetts to Kansas, Florida and Texas. 
C'oiiosii Lee. — Elongate, somewhat depre.s.sed, slightly concave on the 
dorsal line when viewed laterally, color golden-green, moderately shining, sides 
of thorax and elytral vitte piibescent. Antennse rather short, not attaining the 
middle of the thorax, feneous, serrate from the fourth joint. Head broadly 
concave, more deeply impressed along the middle, a tubercle each side of middle 
of front, a rather deep transverse groove above the base of clypeus, between the 
antennal fovea, surface very coarsely punctate, occiput slightly strigose. Thorax 
one-third wider than long, slightly narrowed at base, sides feebly arcuate, mar- 
gin sinuous, hind angles rectangular, with a slight obtuse elevation in the male 
and a feeble carina in the female; disc moderately convex, with a broad and 
rather deep groove extending from base to apex, sides obliquely depressed, sur- 
face punctate and rather coarsely strigose, except on a space each side of median 
groove, broadly clothed with yellowish white pubescence at sides: scutellum not 
transversely carinate: elytra slightly sinuate behind the humeri, feebly broad- 
ened behind the middle, apices obtusely rounded, serrulate, disc comewhat flat- 
tened. with a very well defined costa extending from the humeri very nearly to 
apex, in latter region slightly sinuous ; surface pubescent, but forming a distinct 
vitta within each costa, extending from the feeble basal depression to apex and 
near the latter region twice interrupted, punctuation dense and fine between the 
cost*, coarser exterior to them ; body beneath more shining than above; proster- 
uum sparsely punctate in both sexes, the lobe emarginate, iutercoxal process 
broad, obtusely pointed at apex, propleui-* densely punctate, somewhat strigose. 
distinctly pubescent; metasternum at middle sparsely punctate, at sides more 
densely and finely and with the episterna and outer half of coxal plate pubes- 
cent. Abdomen very sparsely punctate at middle, first and second segments with 
a densely punctured and pubescent stripe at a distance from the lateral margin, 
the next three segments with a pubescent triangular spot at sides, the lateral 
marginal line on the first two segments indistinct and sinuous, the vertical por- 
tions of the segments densely pubescent; pygidium with a feeble carina, which 
does not project ; claws cleft, forming a broad tooth in both sexes. Length .38 — 
.44 inch. ; 10- 11 mm. 
Sexual characters . — The sexes are differentiated with some difficulty. 
I observe that the male has the dorsum less depressed and the carina 
of the hind angles merely a feeble elevation. 
Very few specimens have been seen, and no variations observed. 
This species and cavatus are of an entirely different facies from the 
remainder of our species, being of the type more commonly observed 
in Mexico. It has been supjiosed to be identical with perkicklns 
Gory, an opinion which Crotch thought not well founded. 
Occurs in Arizona and southern New Mexico (Snow). 
