OF NORTH AMERICA. 101 



is drawn up from a mature Californian larva, and differs materially 

 from that just quoted : 



Length 2.00 inches. Head black, clypeus and palpi clear yellow. 



Body black above, mottled with smoky ; smoky below ; with a double 

 broken yellow lateral band, extending from segments four to eleven, 

 inclusive, the space between the two bands mottled and yellowish. 

 Body covered with tubercles, arranged as follows : segment i has six, 

 segments 2-3 have eight, segments 4-10 have twelve, segment 11 has 

 ten, segment 12 has six. Of these tubercles the four dorsal rows are 

 black, giving rise to fascicles of long, irregular, blackish brown hairs, 

 the two central rows being obsolete on segments i, 2, 3 and 12. All 

 the other tubercles are rusty red, and carry long silky rust-red hairs, 

 except those near the head, which are mingled with blackish, as are 

 also those on the anal segments. The hairs on segments 10 to 12 in- 

 clusive, are longer than those on the rest of the body. Stigmata yel- 

 lowish. Prolegs black, banded with yellowish. Abdominal legs flesh 

 colored. 



Larvae as above produce imagines in no wise distinguishable from 

 eastern specimens. It is given as the extreme of divergence in color, 

 as many Californian larvae approach more closely the diagnosis of Dr. 

 Harris. It would be interesting to determine whether these differences 

 in color are sexual, or due to the effect of different food. In the allied 

 genus Antarctia, Hiibner, the larvae of the two sexes are so dissimilar, 

 that they can be readily separated, although perhaps this is scarcely a 

 parallel case as the 5 ? imago are so different that they might be re- 

 ferred to two separate genera by persons ignorant of their transforma- 

 tions. A similar case of discrepancy in the color of the larva between 

 the eastern and western portions of the continent, is to be found in the 

 case of Pyrrharctia isabella. Pack. Eastern larvae are black, with a 

 chestnut red band in the middle of the body, yet I have raised imagines 

 distinguishable, so far as I can see, by no valid specific difference, from 

 larvae found in California of a uniform greyish brown. 



Dr. A. S. Packard, jun., to whom I forwarded Californian specimens, 

 informs me that L. Californica, Pack., is synonymous with L. acraea. 

 ? specimens received from Mazatlan, Mexico, appear to extend the 

 range of L. acraea to that region, as I am unable to seize upon any 

 distinctive difference, although there is a general appearance about the 

 Mexican specimens, which at first sight would seem to indicate a se- 

 parate form. I have also in my collection, specimens of another spe- 

 cies received from the high Sierras of southern California, with imma- 



