68 



In addition to the foregoing five species, all of which are un- 

 doubtedly specifically distinct, if we except C. strigosa, I have 

 before me two other unique specimens which cannot be referred 

 to any of the species herein described. That one of them is 

 specifically distinct, is more than probable from the fact that I 

 am acquainted with a willow-feeding larva belonging to this 

 genus, which is found in California and is different from any 

 species of which the transformations have been recorded, but 

 which appears to be very difficult to raise, and from which I have 

 hitherto been unable to rear the imago. One of these specimens 

 I describe below, under the name of C. thoracica ; while the other, 

 being less strongly marked, is retained for future determination. 

 I have also presumptive evidence, founded on dead larvae, taken 

 from aborted cocoons found in Oregon, of the occurrence of 

 another species, the transformations of which still await elucida- 

 tion. 



C. THORACICA, n. s. (?) 



$. — Entire insect dull red-brown, the primaries rather redder 

 than the secondaries, which are the same color as all the wings 

 beneath. Primaries with exceedingly faint traces of a broad 

 band. Head, thorax and abdomen rather grayer than primaries. 

 Thorax very stout and very hairy, being disproportionately 

 large ; abdomen very short and conical. 



Expanse of wings 0.90 inch ; Length of body 0.40 inch. 



Habitat: Congress Springs, San Mateo County, California. 

 (H. Edwards.) 



Differs widely from all our other species in the structure of 

 thorax and abdomen, and probably belongs to the larva alluded 

 to above. 



C. AMERICANA, Harris, Ins. Inj. Veg., p. 267, (1841). 



C. decipiens, Walker ; Phalmna castrensis, Smith-Abbot. 



Bombyx frutetorum, Boisduval, Ann., Soc. Ent. Belg., vol. 

 12, p. 82, (1868-9). 



Habitat, Eastern States from Maine, (Packard) to Texas. 

 (Belfrage). California (Boisduval). 



Boisduval says of this species that " it is common in Canada 

 and of infrequent occurrence in California." So far as I know it 

 has never occurred on this coast. 



C. DISSTRIA, Hubner. 



Malacosonia disstria, Hubner, Verg. (teste Grote). 



Phaloena neustria, Smith-Abbot ; C. sylvatica, Harris. 



Bombyx drnpaceartun, Boisduval, Ann. Soc. Ent. Belg., vol. 

 12 p. 72, (1868-9). 



Habitat. — Atlantic States from Maine southward (Packard). 

 California (Boisduval). 



Boisduval says of this species " common over a large portion 

 of the United States, much rarer in California." The occur- 



