Memoirs on the coleoptera

142
MEMOIRS ON THE COLEOPTERA
form lines which is most distinct, the outer being as nearly as
possible obsolete; subcostatus was defined wholly from the hind
body, as the anterior parts were missing in the original type, which
was found by the Mexican Boundary Commission.
In rusticus of the above table, the small sparse elytral punctures
have just a suspicion of lineal arrangement on some parts of the
surface. In one example of brevimargo there occurs a singular
deformity, the right hind leg being but slightly longer than the inter-
mediate, while the left hind leg is very much longer as is normally
the case throughout the genus. To the left of the middle of the
hind margin of the fourth ventral in the type of subcruentus, there
is a fine porrect tooth projecting from the margin and bristling
with erect setae. The hind coxae in this type are unusually narrowly
separated, scarcely more than half as widely as the middle coxae,
while in the second specimen, which is also a male and having less
elongate, rather less convex and less strongly margined elytra,
the hind coxae are notably more widely separated, only a very little
less so than the intermediate; this is one of the most pronounced
structural inconsistencies that I have observed, and, if constant,
would imply two remarkably distinct species in spite of the general
similarity of facies of the only two specimens now at hand.
Group II Type blapsoides Sol.
This group is more properly Mexican and in those regions abounds
in species and subspecies; it is however represented in this country
by several aberrant species, forming two distinct sections, the first
of which as arranged below by its general appearance and, especially,
its coarsely and transversely rugose pronotal sides, recalls the
marginatus group very forcibly; it is however well distinguished
by the very convex and more cylindrical elytra.
Prothorax angulate at the sides medially
2
Prothorax regularly and rather strongly rounded at the sides 3
2 Body rather narrow and subparallel, deep black throughout and
strongly alutaceous; head moderately impressed transversely,
strongly, rather sparsely but not very closely punctate, the interspaces
with other punctures which are very minute; antennae well
developed, rather longer than the prothorax, bristling with stiff
spinules, gradually moderately enlarged and compressed through
joints eight to ten; prothorax two-fifths wider than long, fully fourfifths
as wide as the elytra, the apex but slightly narrower than the