PACKARD. — TRANSFORMATIONS OF SATURNIAN MOTHS. 557 



there are, according to Burmeister's figure and description, no tubercles 

 at all, while the body is blackish, with conspicuous transverse bands. 



R. orizaba, as a larva, iu form and markings most nearly approaches 

 that of R. aurota, while the most generalized species is R. speculifer^va. 

 whose larva there are the longest tubercles, most nearly approximating 

 those of Samia and Philosamia. 



Food plant. — Specimens raised from the egg by Mr. Joutel fed on 

 the white ash. Its native food plant is unknown to us. 



Rothschildia jacobeae. 



The materials on which our life-history of this species is based were 

 obtained by the American Museum of Natural History from Buenos 

 Ayres. It consisted of the eggs, inflated larvae in three stages, the 

 pupa, cocoon, with the J 1 and 9 , all in an excellent state of preserva- 

 tion, and I am indebted to Dr. II. C. Bumpus, the Director of the 

 Museum, and Mr. William Beutenmuller, the assistant in charge of the 

 Department of Entomology, for the loan of the specimens. 



Eggs. — Oval, flattened, chalky white ; surface shining, seen uuder 

 the lens to be very finely pitted ; greatest diameter about 2 mm. 



Larva. — Stage IF. The blown larva in the od stage had retained 

 on the last half of the body the skin of what we suppose to be of this 

 stage. It shows, what is not present in the next stage, two parallel rows 

 of 6 linear black spots passing across the segments. On the suranal 

 plate, on each side, is a low flattened green tubercle, bearing six dark 

 spine-like setae. There are faint traces of a reddish spot on the plate, 

 and on the side of each anal leg. All the tubercles black. The median 

 tubercle on the 8th. abdominal segment slightly bilateral, bearing four 

 setae on each side. Suranal plate with a yellow band ou the edge. 



Stage III. What is probably of this stage is a blown larva. Length 

 of body 34 mm.; width of head 2.7 mm. Head pale yellowish brown 

 (probably green in life), clypeal sutures black, and on each side is a 

 black line extending from the eyes up to the centre of the vertex on 

 each side. 



Body green ; cylindrical, with prominent tubercles as in the corre- 

 sponding stage of other Attacine larvae. Prothoracic plate; with four well- 

 developed green tubercles, which are low, rounded, about half as large 

 as those on the 2d thoracic segment, and each bearing six dark setae 

 Tubercles of the 2d and 3d thoracic segments each with fairly large erreen 

 warts or tuberculcts, each bearing a black seta longer than the main 



