Packard.] ^^^ [March 17, 



2. Appearance of a transverse row of dorsal granulations on the liinder 

 end of each segment in Stage IF, persisting tliroiigh larval life. 



3. The eight thoracic spines lose their bulbous tips, and become sim- 

 ply slightly forked in Stage III, and later. 



4. The two dorsal spines of uromeres 1-7 are in Stage II larger than the 

 others ; in Stage III they become ivory-white externally, and in Stage 

 IV larger and silvery white on the outside. 



5. In the last two stages the eight thoracic spines become very much 

 shorter in proportion to the size of the body and become less movable ; 

 as they decline in size and functional importance, the metallic, silvery, 

 dorsal spines on the abdominal segments become conspicuous and appa- 

 rently useful to the larva. 



One larva, 36-37 mm. in length, ceased feeding August 7, and began 

 to pupate, but I did not carry any into the pupa stage. 



What Dr. Jewett means by saying that "the larvae change only in size 

 during the last moult," we do not understand, as the increase, so far as 

 we have noticed, is gradual from Stage I to V, as in other larvae. The 

 brood which Dr. Jewett raised in Ohio, "began to quit feeding on the 

 2Uth of June, entering the ground within a few hours after ceasing to eat. 

 Then the}' pupated within an oval cell lined with a thin cocoon of silk, 

 the first casting its skin on the 24th. The pupa is at first bright green, 

 but changes to jet black in a few hours." 



"Imagines began to appear on July 3, and had nearly all emerged by 

 July 10. The insect is three-brooded here, hibernating in pupa. 

 Although the large majority of each brood ft)llows the cycle of develop- 

 ment as described, yet a few of each brood are much slower in making 

 their changes. Thus a few of the brood did not complete their growth 

 till the end of July, and three pupae, formed June 26, are still alive (Feb- 

 ruary 28), having hibernated. Other pupte of the same brood disclosed 

 their imagines at various periods during July and August. This accounts 

 for the fact that larvae in all stages of development may be found at any 

 time throughout the summer till frost kills their food-plants" (Jewett). 



Remarks on Sphingicampa Mcoler. — This is the most Sphinx-like of any 

 Ceratocampid or other Bombycid I know, resembling sphingid caterpil- 

 lars in the following characters : 



1. The shape of the head and its markings. 



2. The four thoracic horns (like those of Ceratomia) perhaps a case of 

 reversion in the latter. 



3. The caudal horn. 



4. The large, square, heavy anal legs. 



5. The skin granulated with small white tubercles. 



One can, when we take into account the larvse alone, well imagine 

 that the Sphinges are, as claimed by Mr. E. B. Poulton, descended from 

 the Ceratocampidae, though these may be only adaptative characters, and 

 not applicable to the imagines, which dillur in venation, in the tongue, 

 and in the proportions of the head pieces. 



