no. i. BOMBYCINE MOTHS OF NORTH AMERICA— PACKARD. 225 



it varies; in one 9 the scallops are largo, and the sinus between them is deeper and narrower 

 than in the other species, while in the two other examples ( <? and ? ) the line is only slightly 

 scalloped; thu3 in the third subcostal cell, whore in one ? there are two large scallops, with 

 a deep narrow triangular inward-pointing sinus between them, in another 9 (from Olympia, 

 Oreg.) the line is not scalloped at all, unless we except a very slight indentation. 



The submarginal row of intracellular spots are of the same general shape as in the other 

 species, being however pale brown madder, while the two marginal lines are all dark brown, 

 as in S. cecropia. 



Under side of wings as above, but a little paler, the white bands whiter, more pronounced, 

 and the discal spots edged more markedly with black. There is more white in the area beyond 

 the extradiscal line in both wings. The subapical ocellus and white subapical zigzag line and 

 black costal spot are as above. 



Expanse of wings, one o* , 103 mm.; length of wing, 50 mm. 

 Expanse of wings, 9 , 100-130 mm.; length of wing, 48-60 mm. 



This species shows a greater tendency to variation than any of the other species. This 

 is shown in the absence of, or when present the shape of the discal spots, the color of the ocel- 

 lus, the extradiscal line, and the variation in the submarginal dark scalloped line. 



In Mr. Joutel's collection is one without any discal spot in the fore wings. In one 9 the 

 subapical ocellus is light reddish madder, concolorous with the shade beyond the extradiscal 

 line. 



The Oregon example has a beautiful roseate tint not seen in the California example; it 

 is a little darker and the discal spots wider. The outer shade of the extradiscal line is of a rich 

 roseate purple madder. These differences in color I should ascribe to the cooler more rainy 

 region it inhabits, compared with the drier territory of California. 



Whatever may be said as to the origin of the other species, there seems good reason to 

 suppose that the Pacific coast species (califomica) was the last to diverge from the generic 

 stock, as it is the most divergent of the four species. 



[S. rubra was sent to the Department of Agriculture from Chesley, Idaho, by Mrs. D. A. 

 Bishop in 1900; the specimen was determined by Dr. L. O. Howard.] 



Eggs. — A batch of eggs was received from Mr. J. T. Grundel, Alma, Santa Clara, Cal. 

 They were received and some had hatched out July 1, and the following description was drawn 

 up July 2, 1S97: 



Larva. — Stage 1 : Length 5 mm. Body and head entirely jet-black, with no markings 

 whatever. The hairs arising from tubercles are brown or horn color. 



The dorsal tubercles of the three thoracic and eighth and ninth abdominal segments are 

 considerably larger than those of abdominal segments 1-7. The hairs are as long and some of 

 them a little longer than the tubercles themselves. Spiracles whitish, distinct, but minute. 

 The tubercles are longer and slenderer than in S. cecropia, and the hairs are shorter hi pro- 

 portion to the length of the tubercles. 



On July 12 the larva had doubled in length, measuring 10 mm., but it had not yet cast 

 its first skin. It had slightly changed hi color. On abdominal segments 1 to 6 the base of the 

 tubercles of the dorsal alid lateral rows is beeswax yellow. This period is represented by Mr. 

 Joutel's figure. 



July 15, either in the evening or before 9 a. m. of the 16th, the caterpillar had molted. 

 The following description was made at 10 a. m. of the 16th: 



Stage II: Length 11-12 mm. Head black, labrum yellow, body now all straw-yellow; 

 all the tubercles and spines black. On the hinder edge of the prothoracic segment is a trans- 

 verse black line, interrupted on the median line of the body. Mesothoracic (second) segment 

 spotless except a lateral dot; third thoracic segment with a wide triangular black dorso-niedian 

 spot on the front and hind edge, and abdominal segments 1-10 with two similar low wide 

 triangular distinct black dorsal spots; and two subdorsal and two lateral spots; of the lateral 

 spots one is above (in front) and one below (behind) the spiracle, this lower one being the longest 

 83570°— 14 15 



