NORTH AMERICAN COLEOPTERA. 
207 
A. riifipeiiiiiN Lee. — Of the same general liahitus as gularis, but smaller, 
and the pubescence a little more pronounced. It differs in the following char- 
acters: Piceous, elytra ferruginous. Beak shorter and stouter, opaque; striolate 
with several rows of remote punctures, lateral elevated line more prominent, 
median not extending u])on the front. Anteunse pale rufous, club dusky, second 
joint of funicle elongate. Eyes convex, but not free behind. Prothorax scarcely 
one-half wider than long. Elytra semi-opaque, strife and punctures more strongly 
impressed ; interspaces slightly convex, finely rugose, each with several irregular 
rows of punctures ; scutellar space and along the suture darker; the pubescence 
on the under surface is white and as dense as in gularis ; the legs are a trifle 
stouter. Long. 2.2 —3 mm. ; .09 — .12 inch. 
This species varies somewhat in size and coloration, some speci- 
mens are entirely rufous; the pubescence, also, is more pronounced 
in some than in others. 
LeConte’s description: “thorax a little longer than wide,” does 
not correspond with any specimens before me, nor does the statement 
in his synoptic table of species — that the anterior thighs are uniden- 
tate. The smaller, outer cusp is well marked in all but a single 
specimen, in which it is nearly obsolete. 
Hab. — Pennsylvania (LeConte), Illinois, Texas, Florida. 
suturalis Group. 
The species belonging to this group have the anterior thighs uni- 
dentate. The ventral segments decreasing in length from the second, 
the third segment being always longer than the fourth, and this lon- 
ger than the fifth, at least in the male, except corvulus, where the 
fifth is scarcely shorter than the fourth segment. In general, the 
species are rather sparsely pubescent, except suhguttatus, all the 
femora armed with a single tooth (hind pair mutic in melancholwm), 
although the tooth of the posterior pair becomes nearly obsolete in 
specimens of siibguttatus and mondus. The tarsi are more slender 
than in the next group, and the first joint longer than the second; 
the elytra are without a denuded fascia ; lines and spots of pubes- 
cence do not occur, excejit in suhguUatus, more rarely in flavicortds. 
The species are closely related, and while it is not difficult to rec- 
ognize typical specimens, aberrant forms occur whose exact position 
it may not be always easy to determine. 
I have arranged the species as follows : 
Entirely rufo-testaceous or ferruginous, underside of thorax generally darker. 
Elytra finely striate, punctures small, interstices flat, wide; antennae slender. 
Elytral interspaces rugose, prothorax not constricted at apex ; larger species. 
Bolfei’i. 
Elytral interspaces smooth, prothorax strongly constricted behind the ante- 
rior margin riibellus. 
