67 



aYNANDROMORPHISM, OR THE UNION OP BOTH 

 SEXES IN LEPIDOPTERA. 



ANGERONA PRUNARIA. 



PlIAL GeOM. PRUNARIA (LoNNEUS). 

 HiPPARCHUS PRUNARIA (LeaCII. SaMDU CuRTIs). 

 AnQERONA PRUNARIA (DuPONCHEL). 



We have been induced to figure this interesting specimen 

 of a well-known European geometrine moth for the purpose of 

 exemplifying a phenomem, perhaps more frequently observed 

 among this tribe of insects than any other, viz., Avhat is called 

 Gynandromorphism, or the union of both sexes (at least in 

 external features) in the same individual. 



In this instance the whole right side is that of a male and 

 the left that of a female, insomuch that one would say some 

 person had been amusing themselves by attaching the wing's in 

 this manner ; but the impossibility of observing the suture at 

 the point of junction soon convinces us that there has been no 

 artifice in the case, arid that Nature alone has produced this 

 anomalous union. In truth such occurrences are not very rare, 

 and various lists of different kinds of Gynandromorphism have 

 been published by authors. 



The example here 

 figured is called semi- 

 lateral gynandro- 

 morphism, and is the 

 most common kind of 

 it. 



In Angerona Pru- 

 naria the abdomen was 

 dried up in consequence 

 of the specimen hav- 

 ing been long pre- 

 served, so that it Avas 



impossible to determine whether the peculiarity extended to 

 the internal organization. 



In a specimen of Melitea didymus, however, which admitted 

 of dissection, the male organs \vere found complete, and in their 

 usual condition, and there was an ovary placed on the left side, 

 having no connection with any other organ. 



Another kind of Gynandromorphism is called superimposed, 

 the s-exual characters not being disposed transversely, bub 

 according to the longitudinal axis of the body, whence two combi- 



