XV". Ox Gyxaxdromokphism ix the Lepjdoptera. By A. S. Packard, Jr., M.D. 



Read February 17, 1875. 



Jl he immediate object in the preparation of this paper is the description of an interest- 

 ing case of "hermaphroditism" brought to my notice by Prof S. A. Forbes, in charge of 

 the Museum of Normal University, Normal, Illinois, to whose kindness I am indebted for 

 the opportunity of examining this remarkable monstrosity which belongs to that Museum. 



Regarding the circumstances under which it occurred, Mr. Forbes writes me as follows : 

 "I have just heard from the collector of the cocoon from which was hatched our hermaphro- 

 dite C Promeihea ; and although the history of the specimen was not remarkable, I send 

 you the details. The chrysalis was taken from a bush near Evansville, Ind., on the 27th of 

 November of last year, kept, I do not know how long, in a ' glass case ' and afterwards 

 sent to me. Of the other chrysalides of the same lot eight hatched males and four females." 



Female Gynandromorjih of Callosamia Promethea. The antennae on the right side 

 are of the usual length and width (width .13 inch) ; the lower pectinations are a little 

 shorter than those on the upper side. The pectinations on the upper side, which are usually 

 honey-yellow, are nearly as dark as the normal dark ones. These, however, vary in the 

 same way in normal specimens. The left antenna is female, and the ^pectinations are of the 

 same length as in the normal females ; the branches arising from the base of each joint are 

 dark, while in the normal female they are pale yellow, like the pair arising from the distal 

 end of the joint. The front of the head is like the female, the eyes are quite unlike each 

 other, that on the right side being much fuller, more globular than the left eye. I can see 

 no appreciable difference in the eyes of normal 3 and ? examples. The two right wings 

 are male in coloration, but both are shorter and much broader even than in the normal 

 females, and of the same size and shape as the opposite pair. I give the following measure- 

 ments of these wings compared with the normal male and female : — 



The arrangement of the markings are like those of the male ; the basal two-thirds of 

 the wing is black brown, the scalloped line limiting the blackish portion externally is more 

 distinct than in the normal male, and the scallops are much deeper. Beyond this line, the 

 wing on the posterior third is suffused with blackish, and with tawny in front. The sub- 

 mai'ginal black line is much less deeply scalloped than in the normal male behind the fir,-t 



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