FREDERICK BLANCHARD 
15 
6. Aulonothroscus laticeps new species 
Elongate, feebly narrowed behind, pale reddish brown above and below, 
the head above and the thorax except the hind angles, darker. Pubescence 
very fine, the usual coarser hairs rather short and fine. Head large, finely 
punctate, flattened and exactly vertical between the eyes when retracted, the 
latter, in the male, large, separated by little more than a diameter, orbits dis- 
tinctly though finely impressed on the inner side, a small but distinct emargina- 
tion at the insertion of the antennae. Prothorax nearly twice as wide at base as 
long, as wide at base as the elytra, and at apex about two-thirds as wide; disk 
convex, strongly bi-impressed at base, the hind angles broadly explanate, 
with a short very fine but distinct carina near the margin; sides at base par- 
allel, then strongly arcuate to a little before the middle where the margin 
ceases, thence slightly obliquely narrowed to the anterior angles, forming a 
marked sinuation before the middle; surface rather finely and closely, uni- 
formly punctate, more finely and sparsely towards the hind angles, narrowly 
impunctate inside the carina. Elytra elongate, slightly obliquely impressed 
and constricted behind the humeri, thence broadly arcuate and feebly nar- 
rowed to near the apex, where they are strongly arcuate to tips, finely striate, 
with small, subelongate, rather close punctures a little larger than those of 
the intervals, which are rather fine, irregular at basal half of the elytra on the 
second to fifth intervals, in single series beyond the middle and on the sutural 
and outer intervals. Prosternum flat, punctate, striae parallel and nearly 
entire, flanks and also the metasternum and abdomen rather finely, not very 
closely punctate. Metasternum in the male with a long, soft, erect pubescence. 
Length 3 mm. 
The only specimen seen is a male (Nat. Mus. Collection; Type 
No. 7768), collected by Hubbard and Schwarz at Detroit, Michi- 
gan. The antennae are hidden, but will no doubt resemble those 
of calocerus. It is nearest to calocerus but is distinct from the 
male of that species by the yet larger eyes, the more explanate 
hind angles of the prothorax and the less close punctuation of the 
elytral intervals. Calocerus also is entirely piceous brown, but 
darker specimens of laticeps may occur. The sinuation of the 
sides of the prothorax recalls the form seen in Pactopus male, 
though less strong, the thorax being shorter and wider at apex. 
7. Aulonothroscus calocerus Bonvouloir 
Very .similar in form to constrictor but larger and with a shorter thorax; 
pubescence coarse and conspicuous. Head large, finely, moderately punctate, 
the pronotum rather uniformly and a little more coarsely so. Eyes with a 
very small emargination at the insertion of the antennae; larger in the male; 
front convex. Antennae in the male with club strongly pectinate and with 
erect pubescence; first joint stouter and twice as long as the second, the latter 
short and thick, as long as wide and equal to the third and fourth, third to 
eighth very small and close, slightly transverse; the sixth, seventh and eighth 
TRANS. AM. ENT. SOC., XLIII. 
