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cidce. Attacus lima and Polypliemus^ notwithstanding the 

 difference in their hind wings, cannot be separated generically, 

 for their larvge [PL iv, figs. 14, 17] and cocoons are almost ex- 

 actly alike. These two will form one section of the genus, 

 while Oecropia and PrometJiea constitute another. Bombyx lo 

 is much nearer to Saturnia than is Proserpina^ inasmuch as 

 the joints of the antennae are each doubly bipectinated. In 

 Aglia tau each joint seems to have only one branch on each 

 side ; but there are, in fact, two branches which are so close 

 together as to appear like one. In our Proserpina I cannot 

 find that the apparently single branches are in reality bifid ; 

 nevertheless Proserpina comes nearer to Aglia than to Satur- 

 nia. Perhaps lo and Proserpina should be types of new 

 genera. Endromis versicolor^ in the perfect state, is evidently 

 very near to our Proserpina ; but is, with great propriety, made 

 the type of a distinct genus, on account of the form and habit 

 of the larva. It approximates very remotely to Borahyx mori^ 

 to use an Irishism. The Ccratocampiadoi cannot come among the 

 Notodontiadoi Xjx\t\\ovi^\ like some of the latter, e. g.^Pygcera^ 

 they are not true spinners), because the hind wings of the 

 former are reversed in repose, in which they exactly agree with 

 B. lo ; while the hind wings in the Nbtodontiadce ai'e never re- 

 versed. The cocoon of B. To is very slight, consisting only of 

 a little gummy matter, with which a few leaves are fastened 

 together and lined. B. Proserjnna is said by Abbot to trans- 

 form in the ground without making a cocoon ; both of them are 

 gregarious, at least while young. The Ceratocampiadoi are gre- 

 garious also, and transform in the earth without making cocoons. 

 In this respect, too, they agree with Pygcera and the larva of 

 Bryocampa senator ia. Beginning the Notodontiadoi with Py- 

 gcera^ I leave it with Limacodcs, which certainly ought to come 

 in this family, rather than among the Arctioi. The cocoons 

 are egg-shaped, and very hard, as those of Ceriira. Without 

 doubt, that very curious and beautiful moth, the B. torrefacta 

 of Smith-Abbot, should come among the Liparidoi. It is the 



