PlATK XXVIII. 



(To be bound facing Plate XXVIII.) 



Genitalia op Celastrina argiolus. 



Fig. 1. — Genitalia of Celastrina argiolus. var. sikkima x 45. 

 Fig. 2.— ,, ,, ,, ,, (from Aldbury) x 40. 



Fig. 3. — ,, ,, ,, ,, var. pseudargiolus x45. 



[Note that fig. 2 is less magnified than the others.] 



These photographs illustrate well the variation in the ancillary appendages of 

 C. argiolus, too well, perhaps, in one way, that they may convey the impression 

 that C. argiolus (English), has clasps considerably different from the American 

 and Asiatic forms. This is not so. In each race there is considerable variation in 

 the conspicuousness of the four or five teeth on the terminal piece of the clasp. 

 Partly because they really vary in their prominence, partly because, in mounting 

 them, one sometimes really gets a good profile view of them, in other specimens 

 they are taken face view, and their outline is. indistinct on the surface of their 

 own colour. In all cases, however, there are the four or five teeth, and, in each 

 race, considerable range in their development. On the whole, the Asiatic races 

 have them le?s prominent, and in individuals sometimes almost evanescent, whilst, 

 in European forms, they are more pronounced, the one selected for illustration 

 (English) being especially favourable for showing them. 



Fig. 1 is mounted in the way best suited to the appendages of Celastrina, viz., 

 the chitinous ring cut through dorsally and the parts spread out, the middle line 

 of the figure being the ventral line, the extreme ends, being the dorsum of each 

 side, widely represented. (The aedoeagus is separated and is outside the figure.) 

 This method of mounting is good in Celastrina, because tha dorsal processes are 

 well-developed on either side, but reduced in the middle line to a cbitinous band 

 of no structural specialisation. In nearly all other Lyceenids the actual dorsal line 

 is occupied by special structures. Figs. 2 and 3 have been similarly divided, but 

 not satisfactorily spread. They are selected as giving different aspects of the 

 structures, and so possibly a better idea of them to any one not familiar with them. 

 In fig. 2 the eedoeagus is shewn. 



