1910] Barnes and McDunnough—Sphingide of North America 203 
yellow along inner margin. Beneath as above, slightly paler, base and costa of 
fore wing and costa of hind wing largely pale yellow; anal patch of secondaries 
broadly black along inner margin. Expanse 1/4 in. = 38 mm. 
Habitat: Denver, Colo., described from 14 specimens. Types, 
Coll. Barnes. 
All the forms of thetis differ from the eastern races in having 
the anal tuft entirely black. 
Diffinis thetis Bdv. is found typical in certain regions of Cal- 
ifornia along the coast. It lacks all trace of red on wings, having 
the margins and patches deep chocolate brown. The form cyn- 
oglossum Edw. is similar to thetis but can at once be separated by 
the entirely black hind tibia, lacking the yellow hair of thetis. 
Holland’s description of thetis (Moth Book, p. 64) is obviously 
incorrect; he seems to have confused this form with our ariadne. 
We consider rubens Hy. Edw. perfectly worthy of being retained 
as a form name; in fact it seems the most widely spread of the 
western forms, judging by the material at our disposal. It is 
readily separated from the two preceding by the red apical spot 
and more or less pronounced red shading at base of primaries 
and on anal patch of secondaries. The typical locality is Oregon 
and we have specimens from Victoria, B. C., which agree exactly 
with the type specimen. A long series from Utah differ from our 
British Columbia specimens in larger size, smoother squamation, 
and brighter red, while other specimens from Arizona are still 
larger, attaining a size of 50 mm. wing expanse. We hardly 
consider these forms, however, worthy of a separate name. 
(70) H. senta Stkr. Colo., Utah. 
syn. brucei Frch. 
This species is most easily recognized by the entirely yellow 
abdomen on underside and black anal tuft. For the synonomy 
we would refer to our remarks under the preceding species. 
Subfamily PHILAMPELINE. 
Tribe PHILAMPELIC®. 
Genus Pholus Hbn. 
(71) P. anchemolus Cram. Tex. 
