10 
NORTH AMERICAN THROSCIDAE 
not different, it being by the description evidently based upon 
females of this species. 
Northern California; Nevada; Oregon; Washington; Van- 
couver, British Columbia. I have seen about fifty specimens in 
all. 
AULONOTHROSCUS Horn 
The character in the table of genera is about the only one ob- 
served. The side margin of the thorax is as a rule longer than 
is usually the case in our species of Throscus. Most of the species 
are more robust and more coarsely sculptured than in Throscus, 
and many have the antennal club of the male pectinate and that 
of the female feebly pectinate. A smaller number — viz. — punc- 
tatus, validus, laticeps and calocerus, have the metasternum with 
a very fine, long and soft pubescence, which is easily obscured by 
careless mounting. 
Table of Species 
1. Eyes entire; prostemal striae more or less abbreviated; head not cari- 
nate 2 
Eyes emarginate; prostemal striae entire; head bicarinate in front. ... 11 
2. Prostemal striae more strongly abbreviated 3 
Prostemal striae nearly entire 8 
3. Prostemal striae divergent anteriorly ; pubescence coarser 4 
Prostemal striae parallel; pubescence very fine 7 
4. Elytral striae with the punctures elongate; interstitial punctures finer 
than those of the pronotum 5 
Elytral striae with rounded pimctures 6 
5. Form very elongate; prostemal striae more divergent; antennal club 
similar in the sexes 1. parallelus 
Form shorter; antennal club in male much broader than in female. 
2. teretrius 
6. Punctures of elytral intervals not close, as large as those of the pronotum, 
male antennae broader 3. schwarzi 
7. Punctures fine, simple 4. punctatus 
Punctures variolate; pubescence finer 5. validus 
8. Antennae and eyes differing in the sexes 9 
Antennae and eyes alike in the sexes 10 
9. Hind angles of prothorax (cf ) dilated and explanate and with a short dis- 
tinct Carina; intervals of elytra less closely punctate; piceous brown, 
elytra reddish brown 6. laticeps 
Elytral intervals closely punctate; entirely dark brown. . . .7. calocerus 
10. Prothorax strongly impressed each side at base; punctuation coarse. 
8 . constrictor 
Prothorax feebly impressed at base; punctuation and elytral striae ex- 
tremely fine; size very small 9. detritus 
