ADDENDA ET CORRIGENDA. 



ALYPIA OCTOMACULATA, (Page 6.) 



On plate lo, fig. ii is reproduced from a drawing by C. V. Riley, 

 Esq., the larva of this species for comparison. I here give a few notes 

 on the larvae of this species and its allies, kindly sent me by Mr. Riley, 

 to more clearly point out their differences. 



" Alypia ociomaculata. Your description is correct. Each joint may 

 be said to be 8-banded, or to have eight black bands ; and not six as 

 Harris's words would indicate. The species is not abundant round 

 St. Louis. 



^^ Eudryas grata. I have nothing to add to what you have said, 

 except to lay stress on the fact that it is distinguished from Alypia by 

 having only six black bands to each joint, and no white lateral stripe. 

 It is two-brooded. There are short hairs from the black spots, though 

 it would not be amiss to describe it as " naked." A Tachtna fly (near 

 to, if not identical with Exorista leucanicz) is parasitic upon it. The 

 moth simulates a piece of bird dung when at rest. 



' ' Eudryas unio. Larva marked as Fitch says ; at least I so infer 

 from the fact that J. A. Lintner, of Albany, N, Y., wrote me that he 

 had found larvse of Grata abundantly on Epilobium coloratum, which 

 larvae turned out to be Unio. The finding of the larvae or pupae in 

 stems of Swamp Rose-mallow {Hibiscus militaris'), does not imply that 

 the former inhabited the stems ; for both the Gratas and Psychomorpha 

 appear to have an inveterate habit of boring into substances to pupate, 

 a habit not noticed in Alypia. 



* * Psychomorpha epimenis. Differs from Alypia and Eudryas in hav- 

 ing but four transverse black bands to each joint. 



' ' In Eudryas the ground color is really blueish ; in Alypia and 

 Psychomorpha it is white, the blueish appearance is an ocular delusion." 



