328 HETEROMERA. 
femora, and the hind tibial spurs excepted, black; the hind tibie and the first joint of the hind tarsi each 
with four, the second joint of the hind tarsi with three, short, faint, oblique ridges. 
Length to end of the elytra 4, to tip of the pygidium 5, millim.; breadth 13 millim. 
Hab. Mexico, Guanajuato (Sallé). 
One example, probably of the male sex. Very like WM. tevana, of which I at first 
supposed it to be the male: the long maxillary palpi, smaller head, small eyes, and the 
narrower and relatively more elongate shape will, however, distinguish it from that 
species. The pubescence of the elytra, except along the suture anteriorly and along 
the basal margin, is uniformly black, that of the under surface being yellowish-cinereous. 
The larger size and more elongate shape, stouter limbs, &c., separate I. atripennis 
from IM. rubricollis. M. conformis, Smith, from Texas (Bull. Brooklyn Ent. Soc. vi. 
p- 4), is similarly coloured and has the carine of the hind legs as in this species ; but 
the description is inadequate for determination. 
31. Mordellistena incana, 
Moderately elongate, broad, cuneiform, bronze-black, the head and prothorax reddish-yellow, the prothorax 
broadly infuscate on the middle of the disc behind, the upper and under surfaces very densely and 
uniformly clothed with coarse yellowish-cinereous pubescence, the elytral punctuation very dense and fine. 
Head very broad, short; palpi obscure testaceous, the last joint of the maxillary pair very elongate, 
narrow, obliquely truncate at the apex; antennz black with the basal four joints testaceous, short, mode- 
rately stout, joints 3 and 4 about equal in length, 5 stouter but scarcely longer than 4, 5-10 not much 
longer than broad, 11 longer than 10; prothorax broad, transverse; elytra gradually narrowing from 
the base, moderately long; beneath, the head and prothorax excepted, black; pygidium short and stout, 
blunt at the tip, not twice the length of the hypopygium; legs comparatively stout, testaceous, the hind 
tibiee and tarsi a little darker, the hind femora piceous ; the hind tibiz with four, the first joint of the hind 
tarsi with four (the first abbreviated), and the second joint with two, short, parallel, oblique ridges. 
Length to end of the elytra 4, to tip of the pygidium 43, millim.; breadth 14 millim. 
Hab. Mexico, San Pedro in Coahuila (Dr. Palmer). 
One example. This species differs from all the allied Central-American forms by its 
very dense coarse pubescence, the pubescence being similar in colour on the light and 
dark portions of the body. The head and thorax are very broad; the pygidium is 
short, blunt at the tip; the fifth joint of the antenne is scarcely longer than the fourth ; 
the ridges on the hind tibize and tarsi are short, but very sharply defined. It has more 
the facies of a Mordella. 
82. Mordellistena nigriceps. (Tab. XIV. figg. 22, ¢; 22a, maxillary palpus; 
22 6, hind leg.) 
Moderately elongate, subcuneiform, the head black, the prothorax and elytra pale castaneous, each elytron 
with a blackish spot on the middle of the disc at one third from the apex; the pubescence yellowish- 
cinereous, dark brown on the elytral spots. Palpi testaceous, the last joint of the maxillary pair stout 
and securiform, its apical side rounded ; antenne testaceous, filiform, rather short, joints 3 and 4 about 
equal in length, 4 a little stouter than 3, 5-10 slightly thickened, subequal, nearly twice as long as broad, 
5 much longer than 4; prothorax transverse ; elytra very gradually narrowing from the base; beneath 
reddish-brown, the breast darker; pygidium elongate, slender, twice the length of the hypopygium ; legs 
