92 PROCEEDINGS OF THE CALIFORNIA 
pale fawn drab, with the waved band indistinct. The thorax is also much 
paler, and the median patch of this portion much narrower and less defined. 
Mr. Strecker’s figure of the 9 in Lepid. Rhop. et Heter. refers to this 
variety. 
Smerinthus modestus. Harris. 
Another very remarkable instance of departure from the specific type is 
found in our examples of this species, all of which are very large in size, the 
smallest I have seen being upwards of five inches in the expanse of wing, the 
specimens from the Atlantic States rarely measuring as much as four inches. 
There is also a remarkable difference in color, the western specimens being 
much paler, the basal space within the median band being, for the most part, 
of a delicate silver gray, which color is also extended to the thorax and abdo- 
men. The white discal streak is also more strongly defined, and the suffused 
reddish patch of the lower wings usually much larger. Knowing nothing of 
the caterpillar, I am unable to say if any difference exists between it and its 
eastern relative, but it is possible that in this instance we have to deal with a 
new species. I prefer, however, at present to regard it only as a variety, sug- 
gesting for it the name of 
Smerinthus occidentalis, var. Hy. Edw. 
Fort Yuma, Ariz. San Diego. Sacramento, Cal. Carson City, Nevada. 
Dalles, Oregon. 
Coll. H. E. 
Tribe SPHINGINI. 
Macrosila carolina. Clem. 
As far as I am able to discover, this species was unknown in California 
until the introduction of tobacco planting, a few years ago. It is now very 
common in some portions of the State, particularly in the San Joaquin and 
Santa Clara valleys, and promises to be as great a pest to the growers of 
tobacco as it has proved in other parts of the continent. 
Macrosila celeus. Hbn. 
Rather rare at present, though it has been taken near San Diego, and in 
Mendocino and Napa counties. The caterpillar feeds upon the potato, and it 
is probable that, like the preceding species, this may be an introduction from 
the Atlantic coast. 
Macrosila cingulata. Fab. 
I have seen only two Pacific coast specimens of this insect, one from San 
Diego, the other from Santa Barbara. It is very abundant in the Hawaiian 
Islands, where the caterpillar feeds on the sweet potato (batatas edulis). 
