564 PROCEEDINGS OF THE AMERICAN ACADEMY. 



posterior tubercle (medio-dorsal) is small, low, button-like, not con- 

 spicuous ; on neither of the tubercles are there any setae. 



The body is now greenish yellow, with the sutures bathed with yellow. 

 The lateral ridge is also yellowish, and along this ridge is a series of 

 small blackish spots, one to each thoracic and abdominal segment, there 

 being one on the side of the suranal plate. The head, all the legs, both 

 thoracic and abdominal legs, and the under side of the body are pea- 

 green. 



Such differences between the last and the preceding stages as are seen 

 in this caterpillar are very unusual. It is evident that the tubercles and 

 bristles were undergoing reduction in the 4th stage, but one was hardly 

 prepared for the loss, without apparent vestiges, in the last ecdysis, of 

 all except the dorsal ones on two of the segments. The cause, if it 

 could ever be explained, would be most interesting. 



This case reminds us of a member of the same family, Rothschildia 

 bells, but in that form all the tubercles are atrophied, and the change 

 from the penultimate to the last is otherwise probably slight. A more 

 striking resemblance is that to the larva of Cercophana frauenfeldl of 

 Chili, of which there is a colored drawing in the British Museum. In 

 this case the 3d thoracic segment is prolonged into a long curved fleshy 

 horn which projects over the head when the latter is retracted. It has 

 no tubercles, and a yellowish stripe extends from the tip of the horn 

 along the side of the body to the end of the acutely prolonged suranal 

 plate. 



Its resemblance to the last (4th) stage of Aglia tau should also be 

 noticed, though the latter at its final moult discards every trace of the 

 armature of its earlier stages. This larva has what Poulton believes to 

 be a terrifying spot on the side of the 1st abdominal segment. The 

 question arises whether the spot on the front of the thoracic tubercles 

 of Rhodia fugax is of this psychological nature, and also whether the 

 dark patch on the front of the body under the horn of Cercophana is 

 deterrent to other animals. All three of these larvae have a conspicuous 

 yellowish or (on Aglia) reddish lateral stripe. 



Sound produced by the larva. - — Mr. Joutel informs me that this larva 

 in its last stage " makes a squeaking noise by moving its head up and 

 down on the prothorax." 



Caligula japonica. 



A large number of the eggs of this species were received through the 

 kindness of Prof. C. Sasaki of the Agricultural College, Imperial Uni- 



