24 
NORTH AMERICAN THROSCIDAE 
3. Throscus chevrolati Bonvouloir 
Elongate oval, narrowed behind, reddish brown to dark brow^n, the head 
frequently paler in color, pubescent with fine and coarse hair. Head with 
fine, sometimes almost obsolete, distant carinae, slightly divergent above and 
also on the clypeus below; very finely, not closely punctate. Eyes small, 
with dividing impression deep, not evidently differing in the sexes. Antennae 
not greatly differing in the sexes, club with short, even pubescence in the male, 
more irregularly pubescent in the female, about as long as joints two to eight, 
ninth joint not longer than wide, tenth broader transversely than long, eleventh 
somewhat acuminate at apex and about as broad as long, sometimes a little 
longer than wide. Prothorax two-thirds wider than long, sides more parallel 
at base in the male, thence obliquely narrowed to apex, margin usually short, 
but variable; surface finely, regularly punctate, with a fine carina at hind 
angles more or less evident. Elytra finely striate, striae not closely punctate, 
intervals wdth the usual punctures, sides less obliquely and more arcuately 
narrowed behind than in carinicollis. Prosternum with striae entire, diver- 
gent in front; finely, sparsely punctate anteriorly; sides of prothorax beneath, 
metasternum and abdomen punctured nearly as in the preceding species but 
more finely; punctures at sides of first ventral scarcely coarser. Length 1.75 
to 2.75 mm. 
After several attempts to satisfactorily separate parvulus and 
sejunctus, I am obliged to unite both with the present species. 
The uniseriate punctures of the elytral intervals, said to be char- 
acteristic of the forms above named, do not seem to hold good, 
the arrangement of the punctures being practically alike in all, 
but punctures and striae are much finer in western specimens 
than is usually seen in eastern ones; yet I have seen a very few 
small specimens from the East (Illinois — Mr. Leng; Michigan 
and Florida — Nat. Mus. Coll.) that cannot be distinguished from 
typical parvulus from Texas, Vermont, Arizona, and California. 
The relatively coarser punctuation of the prothorax and ante- 
rior prosternum ascribed to sejunctus, seems merely characteristic 
of larger specimens, usually females. 
[Horn says of this species — “widely distributed from the New 
England States to Louisiana and Iowa.” Mr. Blanchard fails to 
record in his manuscript any of the numerous eastern localities 
for this species, naming only those that follow, which obviously 
apply to the western forms parvulus and sejunctus. H. C. F.] 
California (Fresno, Los Angeles); Arizona (Ft. Yuma, Pinal 
Mountains, Chiricahua Mountains); Utah (Utah Lake, Provo); 
Oklahoma (Atoka); Texas (Brownsville, El Paso); Michigan 
(Detroit, a small cf — Nat. Mus. Coll.) and North Illinois (a 
small 9 — Leng Coll.). 
