216 
ANGERONA PRUNARIA. 
PLATE XXVII. Fig. 1. 
Phal. Geom. prunaria, Linn. — Ilipparchus prunaria, Leach^ 
Samou.^ Curtis. — Angcrona prunaria, Duponchcl, 
"We have been induced to figure this interesting 
specimen of a Avell known European geometrine 
moth (occurring also in this country), for the pur- 
pose of exempHfying a plienomcnon 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 
