Dr. G. D. Hale Carpenter on Pseudacraea boisduvali. 647 
missed they are off like a shot and do not often give one 
a second chance.” The Rev. K. St. Aubyn Rogers, 
however, who has had experience of this species at Rabai, 
near Mombasa, is of a somewhat different opinion. In his 
“Bionomic Notes on British East African Butterflies ” 
(Trans. Ent. Soc., 1908, p. 526) he says, speaking of the 
difference in flight between the model and the mimic: “ Its 
flight is more lofty and sustained, and when alarmed it goes 
off at a great rate.” This is exactly my own experience, 
and is the usual case with a mimic of the Nymphaline 
group: they seem to feel that their appearance will not 
bear close examination, and if pursued with intent will 
trust rather to their flight than to their appearance. 
(Cf. the note on Precis rawana in my paper on the Psewla- 
craea eurytus hobley: group, pp. 610, 611). I have never 
been deceived by boisduvali, as I have by eurytus hobleyt. 
The Pseudacraea has a very much stouter appearance 
than its Acraeine model, which is a thin-bodied insect of 
comparatively feeble flight. When at rest on a flower- 
head the Pseudacraea is always on the alert and 1s difficult 
to catch, as it takes alarm before one gets within striking 
distance. The Acraea, however, if struck at, and missed, 
in most cases will return to the same spot. 
~ Rogers (I. c., p. 526) noticed that the integuments of 
the Pseudacraea are very tough, and I have noticed the 
same thing myself. Although the butterfly is not so 
resistant to a pinch on the thorax as is its model, yet it is 
certainly more resistant than Pseudacraea eurytus hobleyr, 
with which I have had a large experience. 
If one compares the series of 8 males and 12 females 
from Bugalla Island (Plate XX XVIII, figs. 2, 6, 7, 8, 9, 10) 
with specimens from other parts of Africa (Plate XX XVII, 
figs. 2, 4, 11, 13), the island forms appear to be intermediate 
between the Eastern and South-eastern forms on the one 
hand and the West Coast forms on the other hand, and 
in this they agree with specimens caught by 8S. A. Neave 
on the mainland of Uganda—a male and a female from 
the N. shore of the lake near Kampala, and a male and 
two females from the W. shore in Buddu. Let us consider 
the males first. 
The mimetic resemblance of the male Pseudacraea bois- 
duvali both East and West.—In the Hope Collection at 
Oxford is a long series of the Eastern form, as follows, 
following an order from N. to 8. :— 
