12 
NORTH AMERICAN THROSCIDAE 
2. Aulonothroscus teretrius new species 
Elongate, parallel, convex, piceous brown, the prothorax deeply bi-impressed 
at base; pubescence very fine, the coarser hairs short. Head and thorax uni- 
formly punctate, the latter more coarsely and closely. Thorax as wide as the 
elytra, about one and one-half times as wide at base as long, sides arcuate 
from base to apex, a little more obliquely in the male. Elytra parallel, slightly 
obliquely impressed behind the humeri, striate with moderately close, sub- 
elongate punctures larger than those of the intervals, the latter a httle finer 
than those of the pronotum and with about the usual arrangement, two to 
five with irregular double punctuation at base, which becomes single behind 
the middle, the outer intervals and the sutural with single series. Prosternum 
sparsely punctate, a little more closely anteriorly, striae gradually a little 
divergent anteriorly, reaching the anterior third or fourth; punctures of the 
flanks of the prothorax and those of the abdomen about alike in size, a few 
coarser ones at the sides of the metasternum, becoming smaller and sparser at 
middle; mesosternal suture not evident. Length -2.9 to 3.5 mm. 
The male has the club wider and pubescent, the female also 
has the club joints slightly produced laterally. The larger speci- 
mens at first sight might be confounded with parallelus, but they 
are evidently more robust and the prosternal striae are less diver- 
gent. The male antennal club is broader than in that species. 
One male has remains of long pubescence on the metasternum, 
but the others are in too poor condition to show it. 
I have seen three males, Detroit (Hubbard and Schwarz — 
Nat. Mus. Coll.); one male, two females. Black Mountains, 
North Carolina (Van Dyke and Beutenmiiller) and three females 
without locality in the Cambridge Museum originally from Zim- 
merman. Type in Nat. Museum Collection. Type No. 7766. 
3. Aiilonothroscus schwarzi new species 
Elongate and parallel like teretrius, finely, thinly pubescent, the coarser hairs 
fine and not conspicuous, sparsely punctate. Head moderate, convex, not 
closely punctate; eyes small, alike in the sexes, minutely nicked at the inser- 
tion of the antennae. Antennae with joints laterally produced in both sexes, 
much more so in the male. Thorax convex and strongly bi-impressed at base, 
scarcely more dilated at sides behind in the male, in both sexes sides parallel 
at base, thence strongly arcuate to anterior angles, uniformly, not closely 
punctate, a subobsolete carina visible at hind angles in some specimens. 
Elytra elongate parallel, finely striate, first and second a httle more finely, 
with moderately close, rounded punctures, not at all elongate, finer in the 
sutural and subsutural striae; intervals not closely punctate, on two to five 
almost regularly biseriately so towards the base, becoming uniseriate behind; 
sutural and six to seven uniseriate, eight to nine biseriate, the latter finer 
but distinct. In one small male the punctures are ahnost entirely uniseriate. 
Prostemum sparsely punctate, punctures larger and more numerous ante- 
