1910] . Barnes and McDunnough—S phingide of North America 195 
prominent in this species, but may, however, often be used as a 
means of separation. 
(25) H. vancouverensis Hy. Edw. 
(a) form albescens Tepp. Utah, Colo., Wash., B. C., Man. 
The specimens in Dr. Barnes’ Coll. do not seem to verify Bruce’s 
statement that vancowverensis and albescens are two seasonal 
forms. We have specimens of vancouverensis dated May 8 
(Colo.), May 10 (Wash.), June 16 (Colo.), June 9 (Mani- 
toba), July 8, 24, (Colo.), and albescens dated May 1 and 5 
(Colo., B. C.), June 24 (Colo.), and July 26 (Colo.). 
(26) H. libocedrus Hy. Edw. 
(a) libocedrus libocedrus Hy. Edw. Ariz. 
(b) libocedrus insolita Lint. Tex. 
Rothschild & Jordan separate these two geographical races by 
the color of the abdominal side spots, in libocedrus they are white, 
whilst in insolita they have a yellowish tinge. Lintner in his 
original description of insolita states, however, that “elongated 
patches (bands) of clear white scales extend over nearly half of 
each of the segments on its anterior half.’’ Of the two specimens 
we have seen from Texas, both 2’s, one has the spots of a dis- 
tinct yellowish tinge, in the other they are almost pure white, 
so we are inclined to think that Rothschild & Jordan’s diagnosis 
will hardly hold. The material of libocedrus, however, at our dis- 
posal is too much worn on the abdomen to allow of our forming 
a definite opinion in this respect. 
(27) H. perelegans Hy. Edw. 
(a) form asellus R. & J. Colo., Ariz. 
(b) “ perelegans Edw. Cale ba Cs 
Apart from the difference in genitalia it is almost impossible 
to separate asellus from a small gray form of chersis. The form 
of the harpe is, however, so markedly different in both species 
that even a superficial examination of the genitalia serves to 
separate them. Whether asellus is a form of perelegans or may 
prove to be a good species we do not feel competent to decide. 
As far as our own experience goes, the two forms occur in differ- 
ent territory, which would at least point to a geographical sub- 
