38 



says, invariably goes together with the greater pointedness of the wing point. 

 In this connection we are reminded of the difference correctly pointed out 

 by Wallace, although he interpreted it quite fantastically, in the form of the 

 primaries between individuals of the same species inhabiting Java and Celebes. 

 Moreover in various butterflies, such as in the Lycaenidae Lycaena Ouadriplaga 

 Sn. and Allotinus Horsfieldi Moore, the shape is more rounded in the 9 

 than in the c3", which also points to a different stage in the process of form 

 development, but does not therefore mean a specific difference. The species, 

 as is also shown by the variation of colour especially in the 9, is clearly in a 

 state of differentiation, which is further advanced in some individuals than in 

 others. Moreover in the matter of the greater or less width of the greyish-black 

 costal margin of the 9, the presence or absence of a black spot above the cross vein 

 on the upperside of the primaries, and the lighter colour of the underside, there 

 are undoubtedly differences in the individuals, but they are by no means so 

 regularly connected with eachother as to justify a separation into two species. 

 I, therefore, requested Mr. van Eecke, conservator in the National Museum 

 of Natural History in Leiden, who has made a special study of the subject, 

 to examine the genitals of these species, and he found that the structure of the 

 genitals of all my lo c? is the same, but that differences occur in the details, 

 which points to the same conclusion. The 9 specimens of this species are not 

 suitable for an examination of this kind. 



HoRSFiELD, Cal. Lep. E. I. C, p. 77, No. 12 (1882). Lycaena Pavana. 

 Marshall & de Niceville, Butt, of Ind., Ill, /. 145, 



//. 26, jig. 182 (1890) Nacaduba 



Snellen, Tijdschr. v. Eiit., XXXIX, /. 93 (1898) . . Lycaena Subperusia. 

 SwiNHOE. Lep. Ind., VIII, /. 78, //. 657, fig. 3, 



2>a, 3'^. y (1910 — II) Nacaduba Pavana. 



W. J. Batavia (3 — 14); Buitenzorg (285); Depok (95); mount Gedeh ; 

 mount Salak (780) ; vicinity of the Wijnkoopsbay or Pelabouan Ratou and Tjiletou 

 or the Sandbay on the south coast (± 1 50). 



C. J.? 



E. J. Mount Semarou (800). 



21. Atratus Horsf. (PI. XXI, a, b). 



In this species, to which the above remarks also apply I should include 

 the L. Perusl\ of Felder, which Snellen considers as a separate species, for 

 neither from his description, nor by comparison of the specimens in my col- 



