66 



hairs in the black margin of the stripe. Each segment on its an- 

 terior edge has a lateral bunch of white hairs directed downwards, 

 and above the feet there is a continuous line of depressed white 

 hairs. Beneath, the body is smoky. Abdominal legs smoky, 

 testaceous at tips. Length, 1.25 to 1.50 inches. 



Varies in the brilliancy of the dorsal stripe and the intensity 

 of the color in the lateral black stripe. Beneath the black stripe 

 there is in strongly marked individuals (usually small S?) a. faint, 

 pale whitish ochre, broken, slender stripe, and the fold above the 

 feet is of the same color. 



The larvae from which the foregoing description was drawn 

 were late specimens, mostly ichneumonized. They were found 

 May 27, at which time many cocoons were found empty. The 

 cocoon is whiter than that of C. califo7"iiica. 



Imago (?. Entire insect dark cream color with a faint tinge 

 of reddish brown ; the front of the head, and thorax beneath, 

 round the head, of a deeper shade. 



Anterior wings with a faint, narrow, transverse band, seldom 

 completely defined, but most clearly seen on the costal margin, 

 and consisting of two dark lines, the inner one straight, the outer 

 one diverging from the inner as it approaches the costa, where it 

 is bent sharply inward towards the base of the wing. Space be- 

 tween the lines scarcely darker than the rest of the wing, and 

 about half the width of the terminal space; fringes with faint 

 traces of dark scales at the end of the nervules. Secondaries im- 

 maculate. 



Beneath, same as above in color, but the primaries have a 

 more decided reddish tinge, and the basal half of the wings, as 

 far as the outer line above, is uniform reddish brown. 



$ . Reddish brown above and beneath ; primaries above 

 sprinkled with pale scales. Band of primaries more distinct, 

 rather broader, and rather darker than the rest of the wing. 

 Fringes paler. 



Expanse of ivings, $ i. 00 to 1. 10 inches. ? 1.40 inches; /^«^//^ 

 of body 6 0.50. ? 0.55 inch. 



Habitat. Mountainous districts round the bay of San 

 Francisco. 



This species is abundant on the black oak {QuerciLS Sonojuen- 

 sis), the larva being full fed about the middle of May. Mr. H. 

 Edwards has raised the species frequently, and it appears to be 

 more constant in its coloration than C. californica, which varies 

 quite as much as C. neustria, and to be at the same time confined 

 to the mountainous regions where Q. Sonoviensis is common. It 

 has never been found, so far as I know, close to San Francisco, 

 although Quercus agrifolia, the food plant of C. californica, is 

 common in that vicinity, from which we may conclude that its 

 range of food is limited, more so indeed than that of the latter 

 species. 



