310 
GEO. H. HORN, M. D. 
A. eavatiiK Cbcv.— Elon<;ate, much narrowed posteriorly, cupreous or cu- 
preo-ff*ueous. sliiuing; elytra with pubescent spaces. .Auteuuie jeneous, attaiiiiuK 
the middle of the thorax, serrate from the fourth joint. Head deeply excavated, 
forming two tubercular elevations at lower inner border of eye, a deep transverse 
depression above the base of clypeus, surface coarsely not closely ))uuctaie' 
Thorax nearly a half wider than long, slightly wider at base than apex, sides 
feebly arcuate, margin sinuate, hind angles rectangular, with a slight tuberosity 
replacing the carina. disc convex, with a deep oval depression widest posteriorly, 
lateral depressions moderately deep, surface punctate and transversely strigose; 
scutellum transversely carinate; elytra parallel for a short distance behind the 
humeri, then slightly sinuate and gradually narrowed to apex, apices rounded and 
serrate, disc slightly depressed with a vague costa extending from the humerus 
two thirds to apex, less distinct in the female, basal dejtression moderate, surface 
not closely punctate, somewhat imbricate at the sides, a sparsely pubescent vitta 
from the humeral depression two-thirds to apex, a small spot posteriorly ; body 
l)eneath more brassy than above ; prosternum sparsely punctate, the lobe rounded, 
intercoxal process rather broad, obtusely pointed at apex, propleurse more closely 
punctate, strigose and sparsely pubescent ; metasternum sparsely punctate, the 
episternuin and outer half of coxal plate densely pubescent. Abdomen sparsely 
punctate.'somewhat strigose on the sides of the first two segments, third segment 
with a densely pubescent spot at side ; vertical portion of the segments densely 
pubescent, except the second ; pygidium coarsely punctate, the carina not pro- 
jecting. Length .36 — .,56 inch. ; 9 — 14.5 mm. 
Sexual characters . — The males may be known by their smaller size, 
more slender form, the abdomen less dilated beyond the sides of the 
elytra, the elytral costa better defined, and the tuberosity in the hind 
angles of the thorax less so. There are no ventral characters. The 
claws are cleft quite near the tip, forming an acute tooth in the front 
and middle claws, more broadly toothed on the posterior. The tibite 
are not mucronate. The female claws do not differ. 
Variations . — When carefully collected specimens are at hand the 
elytral vitta extends from the humerus two-thirds to apex, forming 
at its end a denser spot, on each side there is a short pubescent vitta 
opposite the end of the former and a short distance in the front of 
the apex a small pubescent spot. By abrasion the greater ]>art of 
the vitta is often lost, and there then remains a basal spot, the denser 
end of the vitta and the ante-apical spot. 
Hab — Southwestern Texas, extending well into Mexico. 
.A. coiieiiiiiii^ n. sp.— Form somewluit resembling ?uacer, but more obtuse 
posteriorly, thorax more or less cupreous, elytra bicolored, the outer side brassy 
green, the middle on each side of suture dull olive-bronze, almost black. An- 
tennae attaiuiug the middle of the thorax, piceous, slightly bronzed, serrate from 
the fourth joint, the serrate joints wider than long. Head not deeply concave, 
a vague median depression and a feeble transverse depression slightly above the 
middle of the front, surface not closely punctate, vaguely strigose, more evi- 
