H04 
GEO. H. HORN, M. D. 
s])ots (altliongh these are uot very distinct) and the comparatively 
smooth abdomen without conspicuous jnibescence. 
Hah . — Western Nevada (Morrison). 
A. iii v('i vditri^ n. sp. — Form rather more slender than politus ; color 
bright coppery, with the thorax slightly brassy, varying to olivaceo cupreous. 
Antenna? ieneous, attaining the middle of the thorax, serrate from the fourth 
joint. Head feebly convex, a slight median impressed line from the occiput to 
the middle of the front, the latter densely punctate, occiput slightly strigose. 
Thorax one-third wider than long, sides regularly arcuate, lateral margin slightly 
sinuate, hind angles with a strong, arcuate carina, disc convex, with a vague 
median depression composed of an anterior and a posterior depression, lateral 
dej)ression feel>le; surface transversely strigose, with punctures between the 
strigse; in some specimens the striga? are very feehle; scutellum transversely 
carinate; elytra sinuate behind the humeri, slightly broadened behind the mid- 
dle, apices separately rounded, finely serrulate, disc slightly flattened at middle 
with an extremely vague costa; surface with imbricate sculpture, less close and 
more shining than in politus, with three indistinct pubescent spots, often merely 
indicated by a slightly denser punctuation, these spots placed as in nevadensis ; 
prosternum densely punctured, the lobe acutely emarginate at middle, the inter- 
coxal proce.ss i)arallel, acute at tip, propleurse densely punctured with consiiicuous 
whitish pubescence; metasternum at sides densely |ninctate and transversely 
sti’igose, pubescent as in the propleurpe. Abdomen sparsely punctate at middle, 
more densely at the sides and finely strigose, especially on the first two segments, 
vertical portions of the segments densely white jiubescent; pygidium coarsely 
punctured with a strong median carina, projecting at apex. Length .25 — .37 
inch. ; 6.5 — 9.5 mm. 
Male . — Front slightly flatter; tibise not distinctly inncronate; 
claws cleft one-third from apex, forming an achte tooth ; first ventral 
segment flattened at middle, the second with a slightly depressed, 
smooth space at anterior half of middle. 
Female . — Front slightly convex ; tibite not inncronate; claws cleft 
at middle, forming an acute tooth. Ventral segments convex at 
middle, the first much smoother than on the male. 
VariatioiU . — The color variation has been referred to. In many 
specimens there is on each side of the median line, nearer the front, 
a fovea which is as often absent. In very carefully collected speci- 
mens the sides of the thorax above have a white efflorescence, and 
the body beneath, at sides, seems very densely pubescent, owing to 
the efflore.scence between the hairs. This is, however, so easily lost, 
one might readily suppose two specimens to be distinct species which 
had been unecpially handled in collecting. 
The three jnibescent spots on the elytra are, at best, very feeble, 
and some care must be used in their observation. 
Habits . — Nothing is known to me. 
