FREDERICK BLANCHARD 
25 
4. Throscus mendax Horn 
Oblong, feebly or not at all narrowed behind, rather shining, finely pubescent, 
the coarser hairs sometimes present but not conspicuous; reddish or darker 
brown, the elytra frequently darker than the head and thorax. Head finely, 
closely punctulate with not very evident, sparse, slightly coarser punctures, 
bicarinate, the carinae distant and slightly convergent in front and divergent 
on the clypeus. Antennae as usual, the club small, equal to joints two to eight, 
with a short, close, even, erect pubescence on the margins and upper side 
in the male, with a few longer hairs intermixed; irregularly pubescent in the 
female. Prothorax slightly dilated at base in the male, as wide as the elytra, 
the hind angles more or less evidently carinate, sometimes very feebly so, side 
margins reaching a httle beyond the middle. Anterior wddth about half that 
at base, which is about two-thirds greater than the length. Surface slightly 
convex, feebly bi-impressed at base, finely, sometimes rather sparsely punc- 
tate. Elytral striae fine, with fine, rather closely placed punctures; sutural 
interval finely, uniseriately punctate, the second and third confusedly punctate 
at base, becoming somewhat uniseriate behind; outer intervals becoming vari- 
olate punctate and coarser behind, on the ninth interval only evident pos- 
teriorly. Prosternum finely, sparsely punctate, striae slightly divergent in 
front; punctuation coarser at sides and outside the antennal grooves, also on 
the hind coxae and first and last ventrals. Male with elytra fringed at sides. 
Length 2 to 3 mm. 
The broader, more robust form, the close, fine pubescence re- 
sembling that of sericeus, and the variolate punctuation of the 
intervals distinguish this from any of the forms of chevrolati. 
Some females with the prosternal striae feebly abbreviated 
have been referred to this species; such specimens will be 
difficult to separate from large specimens of sericeus, if they 
be really distinct. 
Northern California, Oregon and Washington. 
5. Throscus sericeus LeConte 
Elongate oval, narrowed behind, pale reddish to dark castaneous, usually 
dull, sometimes feebly shining, with a very fine, prostrate pubescence, coarser 
hairs not obvious. Head convex, finely, closely punctate and bicarinate as 
usual. Antennae with club small, similar in form in the sexes, with short, even 
pubescence in the male. Prothorax evidently a little more dilated at base in 
the male, parallel, thence obliquely narrowed to apex; in the female the sides 
are broadly arcuate; side margin short, sometimes not quite reaching the 
middle; carinae of hind angles feebly evident; disk convex, broadly bi-im- 
pressed at base, finely, not closely punctate. Eljdra finely striate, striae finely 
punctate, intervals variolate punctate except the sutural and second, the 
punctures becoming larger behind. Prosternum with the striae distinctly 
more or less abbreviated in front, finely sparsely punctate, punctuation gener- 
ally as in rnandax. Length 1.75 to 3 mm, 
TRANS. AM. ENT. SOC., XLIU. 
