Memoirs on the coleoptera

122 MEMOIRS ON THE COLEOPTERA
ulate; surface alutaceous, evenly and strongly convex, the lines rather
narrow and convex, the intervals broad, scarcely at all convex,
rather strongly creased, subrugose and with numerous rather coarse,
sparse and very irregular punctures; side margin in the form of an
elevated, obtusely rounded, prominent ridge extending almost to
the apex; epipleura feebly inflexed, deep as 6
usual, more polished,
feebly rugulose and finely, sparsely punctate; abdomen with the
punctures sparse but larger than usual, the hind tibiae very feebly,
evenly bowed. Length (9) 27.0 mm.; width 12.2 mm. Colorado
(La Junta) aucta n. sp.
Form rather slender, black; head distinctly, obliquely bi-impressed
and also impressed on the median line basally, only feebly alutaceous,
finely, sparsely punctate, the minute hairs evident; prothorax fully
three-fourths wider than long, nearly as in data but with the sides more
gradually and broadly reflexed, coarsely, closely punctured and trans-
versely, moderately rugose, the edge with some small punctures only;
apex evenly sinuate and as wide as the base, widest at the middle;
apical angles very obtuse, scarcely at all everted; elytra evidently
more than twice as long as wide, evenly elongate-oval, gradually
obtusely acuminate behind, widest at the middle, the sides of the
base obliquely prominent; surface evenly, not very strongly convex,
only slightly alutaceous, the lines moderate, convex, the intervals
about twice as wide and equally convex, nearly smooth, the broadly
impressed lines confusedly, closely and rugosely punctured; side
margin obtusely elevated, joining the second line near the apex;
epipleura with a lower marginal convex ridge extending almost to
the base, this character being more developed than usual; abdomen
minutely, remotely punctate; legs rather stouter than usual, the
hind tibiae feebly bowed medially, strongly, closely punctatoasperate.
Length (cf) 25.0 mm.; width 10.0 mm. New Mexico
(Grant Co.) alaticollis n. sp.
Difformis is placed as a subspecies of data on the opinion of
G. H. Horn and because the published characters give evidence of
no striking differential character, but its locality is rather uncertain.
The genus Tisamenes, of southern Mexico, seems to be allied
rather closely to Gonasida, having a nearly similar form of body,
legs and prothorax, but differs in its striking and peculiar vestiture,
short antennae, stiff inferior hairs of the tarsi and in elytral structure,
to such an extent that there can be but little doubt of the mutual
distinctness of the two genera. Asida ingens Champ., will form
still another genus, probably not closely allied to either Gonasida
or Tisamenes.
Bothrasida n. gen.
This genus and the following, though having the rough elytral
sculpture more characteristic as a rule of the Pelecyphorus series,