434 Dr. A. G. Butler on new African Pierinse 



the upper surface, it is altogether less brilliantly coloured 

 below. 



Belenois crawshayi, Butl. 



We now possess wet, intermediate, and dry phases of 

 both sexes of this species ; B. diminuta was based upon 

 the female of the dry phase. 



In the collection made by Dr. Gregory in British East 

 Africa is a species related to the preceding which I con- 

 founded with the Eastern form of B. zochalia : a careful 

 study of the two has now convinced me that this was an 

 error, the form of the wings being constantly very different, 

 and the costal margin of the primaries and the abdominal 

 margin of the secondaries being noticeably shorter. 



Belenois formosa, sp. n. 



$ Belenois zochalia (part), Butler, P.Z.S., 1894, p. 579, 

 pi. xxxvii, fig. 3. 



$ . Primaries white above, the basal area nacreous ; secondaries 

 white or pale sulphur yellow ; markings as in B. zochalia. 



At first I was inclined to regard this as the dry phase 

 of the East- African representative of B. zochalia, but the 

 coloration and vivid marking of the male are so distinctly 

 characteristic of a wet-season phase, that I was compelled 

 to abandon this idea as soon as it occurred to me. Un- 

 doubtedly the pattern of the females of both forms is very 

 similar, but nevertheless I feel sure that two species exist ; 

 we have five males and three females of B. formosa. 



Of typical B. zochalia from South Africa we have wet, 

 intermediate, and dry forms of both sexes; they differ 

 chiefly in the definition of the black markings on the 

 under surface. 



Belenois sever ina, Cramer. 



Of B. severina we have an immense series commencing 

 with the wet-season B. infida (P.Z.S., 1894, pi. xxxvii, 

 figs. 1, 2), passing through two fairly defined intergrades, 

 of which one is typical B. severina, to the extreme dry 

 form, which nearly resembles B. creona on the under 

 surface. B. loguensis of Felder is a Northern race of the 

 species showing less variation, the wet phase being not 

 much unlike the first intermediate phase of B. severina, 

 but the dry phase more nearly approaches B. creowa. 





