160 



have been of the mind that there were two species of these ; 

 also of the true Pygcera, one ministra, the other scarcely 

 distinguishable from it at first. When next in the Museum, 

 I will again look at his drawings. I hope to have a specimen 

 of Acontia Solaris for you when I send next. The resemblance 

 between this and Eudryas is only an analogy. I mean an- 

 alogy in the sense in which Swainson and MacLeay use it. 



I think I told you that the specimens of Argynnis you 

 sent me are .the true Cybele. Aphrodite is smaller than the 

 smallest Cybele I ever saw. Do you ever get Troilus near 

 you ? I have but very poor specimens. I have as yet but bad 

 specimens of P. Grlaucus, but hope for more this winter from 

 Wilmington, Del. Wilcox told me it was found at New York. 

 Do you take Tliecla Damon Cr. = Smilacis Boisd. ? I have 

 only one which you gave me. I saw it plenty near Cumber- 

 land Gap, Tennessee, but could not then catch any. 



DOUBLEDAY TO HARRIS. 



EPPING, Feb. 27, 1841. 



In a box I received the other day from my friend Calverly are 

 two specimens of a Colias like to, but distinct from Philodice. I 

 have Pliilodice in all its varieties (Query ; are not some of these 

 species, with Boisduval ?), but none came near to this. It is 

 smaller and has no black border to the under wings, only a faint 

 black tinge along two nervures. Its whole aspect is different. 

 One is an albino, white where it should be yellow, but has a 

 faint yellow tinge towards the inner margin of the anterior 

 wings. I have two or three specimens of this variety of PJiilo- 

 dice, but all differ much from these two. Both are ? . The 

 black, discoidal spot on the anterior wings is very distinctly 

 pupilled with white above. It will not agree with any described 

 by Boisduval, in the Suites a Buffon. I have a suspicion that 



