207 



parasites bred by Mr. Smith, and besides tliem a larger number 

 taken by myself out of the cocoons kindly forwarded by Mr. Smith 

 and all types of Dr. Packard, there can be no doubt that I have 

 before me the right Cr. Samiae. 



All the specimens prove Mr. Eiley's supposition correct, and that 

 inadvertently the terms "coxae" and "trochanters" were misap- 

 plied. Farther, that the females seen by me have a conspicuous 

 apical white spot. The Museum had sent, according to the wishes 

 of Mr. Cresson, March 9, 1868, a lot of Ichneumonidae, and among 

 them a large number of the specimens bred by Mr. Smith from 

 Cecropia, Polyphemus and Columhia, and as these w^re returned 

 named in Jan. 15, 1872, about the time of issue of Mr. Eiley's Ke- 

 port on those parasites, I studied them carefully. There are twenty- 

 six females and twenty-three males, all named Cr. nuncius by Mr. 

 Cresson, but on comparing them, I found all females but two, even 

 the label-bearing specimen, to be Cr. extremaiis, and of the males 

 eight Cr. extrematis, the others, including the label-bearing specimen, 

 to be Cr. nuncius, but these all without the white apical spot of the 

 abdomen, all being bred from Polypliemus. Of course there was 

 some doubt if I knew at all the real Cr. extrematis, but I had seen 

 a type sent by Mr. Smith, and named for him by Mr. Cresson in 

 1867, with the remark " Cr. extrematis Cresson is probably a variety 

 of Cr. 7iuncius Say," and the note " that there had been no males 

 of Cr. extrematis or females of C. nuncius in the collection sent 

 for determination." Between a dozen sj)eciniens communicated by 

 Mr. Smith to me, I find two males of Cr. extrematis, and two females 

 of Cr. mcncius, removing my last doubts, and proving that Mr. 

 Cresson had not been decided about the diflferences and limits of 

 the two species. 



There is also Cr. extrematis, identical with Cr. Samiae, joarasite 

 on Cecropia and Columhia, and Cr. nuncius parasite on Promethea 

 and Polypliemus, for the latter species the males without the apical 

 spot. 



Of Cr. Smifhii twenty-two specimens, male and female, are before 

 me, two of them from Pennsylvania, all others bred by Mr. Smith. 

 Of the specimens with certainty bred from Columhia, seven are 

 before me, males and females, among them the types with the orig- 

 inal labels of Dr. Packard. Fifteen specimens, including some of 



