434 Dr. A. G. Butler on new African Prerine 
the upper surface, it is altogether less brilliantly coloured 
below. 
Belenois crawshayt, 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. 
a Belenois zochalia (part), Butler, P.Z.S., 1894, p. 579, 
pl. xxxvui, fig. 3. 
2. 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. 
Belenors severina, Cramer. 
Of b. severina we have an immense series commencing 
with the wet-season Bb. infida (P.Z.S., 1894, pl. xxxvui, 
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. boguensis 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. ereona. 
