114 Prof. J. 0. Westwood on two Gynandromorjphoiis 



The specimens exhibiting this partial gynandromorphism 

 hitherto observed, belong, for the most part, to the Diurnal 

 Lepidoptera, in which the sexual variation in the markings 

 and coloration of the wings quickly catches the eye. 

 Doubtless, however, they are more numerous than has 

 hitherto been supposed. But they are of course liable to 

 be overlooked in the vast multitude of species of all orders 

 where the external sexual distinctions are not conspicuously 

 distinct. 



The individuals figured in the 35th plate of my Thesaurus 

 Entomologicus (in addition to Mr. George Semper's speci- 

 men of rapilio Pollux figured in the Wiener Ent. Mo- 

 natschr. Bd. vii. pi. xix., from India) are Pieris Pyrrha in 

 Mr. Hewitson's collection, in which the pair of wings on 

 the left side and the anterior right wing are male, whilst 

 the hind right wing exhibits a mixture of the female 

 brightly-coloured markings, especially towards the outer 

 angle. Several specimens of Euchloe Cardamines are 

 figured, in which patches of the male orange colour appear 

 on one of the wings, otherwise female ; specimens also of 

 Anthocharis Evippe, Goncpteryx Rhamni, Siderone Isi- 

 dore, HipparcMa Semele, 3Iorpho Snlkowskyi, Polyom- 

 matus Adonis, and Lasiocampa quercus are described and 

 figured together with a specimen of Calepteryx Virgo, in 

 which the right hand fore wing is irregularly marked with the 

 sexual colours. The specimen of Hipparcliia Semele, in 

 Mr. F. Bond's cabinet, in size and general appearance, as 

 well as in the structure of the fore legs, is a male insect, 

 but the left fore wing does not exhibit the peculiar rugose 

 portion of the disc (as seen in the male) to its full extent, 

 whilst the apical portion is marked as in the female. Mr. 

 Bond also possesses a male specimen of the same species 

 of butterfly having the apical half of all the wings marked 

 as in the female. 



In this species of Hipparchia the secondary sexual cha- 

 racter of the wings is not confined to the colour or markings, 

 but extends also to the clotliing of the wings, the greater 

 portion of the disc of the fore wing being covered with ordi- 

 nary shaped oval scales, which are affixed to the wing in little 

 cups placed transversely in rows at equal distances apart ; 

 but in the rugose portion of the fore wings (characteristic 

 of the male) the membrane of the wing is covered quite 

 irregularly with a vast number of the small cups, the 

 characteristic male scales, or plumules (as they are termed 

 by microscopists), occurring in these parts in vast numbers. 



