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ANGERONA PRUNARIA. 

 PLATE XXVII. Fig. 1. 



Phal. Geom. prunaria, Linn. — Hipparchus prunaria, Leach, 

 Samou.f Curtis. — Angerona prunaria, Duponcliel. 



We have been induced to figure this interesting 

 specimen of a well known European geometrine 

 moth (occurring also in this country), for the pur- 

 pose of exemplifying a phenomenon perhaps more 

 frequently observed among this tribe of insects than 

 any other, namely, what is called Gynandromor- 

 phism, or the union of both sexes (at least in exter- 

 nal 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 wings 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, and that Nature alone has produced this ano- 

 malous 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 

 gynandromorphism , and is the most common kind 



