Lepidoptera from the White Nile. 161 
Swinh., from 7. daira, Klug. Specimens of 7. yerburvi, 
however, collected at Lahej, Arabia, by Captain Nurse and 
determined by Colonel Swinhoe, who presented them to 
the Hope Collection, correspond closely with 7. daira as 
figured by Klug. The locality given by Klug for 7’. dara 
being “ Arabia felix,” it seems improbable that 7. yerburw 
can be more than a synonym for 7. daira, though Mr. 
G. A. K. Marshall and Professor Aurivillius agree with Dr. 
Butler in keeping them distinct. 7’. evagore, * Klug, which 
is no doubt identical with Z. sazews, Swinh., is regarded 
by Butler as the dry-season form of 7. yerburii. Whether 
T. glycera, Butl., be considered as a species, or as a mere 
local race of 7. antigone, there is no doubt that it is barely, 
or perhaps not at all, separable from 7’. evagore. Hence, 
if 7. evagore be the dry- season form of the Arabian 7’. 
yerburii (i.e. 7. daira), T. glycera should be the dry-season 
phase of the form of 7’. daira occurring in the same locality 
with itself, viz. on the White Nile. When, however, 
Captain Dunn’s collection arrived from the Bahr-el-Zeraf 
branch of that river, it was found to contain 7. glycera 
in different seasonal phases, all of which were quite distinct 
from the specimens of 7’. daira captured in the same 
district. In dealing with Captain Dunn’s collection Dr. 
Butler * makes no attempt to unite these two forms, and 
the examination of Mr, Loat’s specimens convinces me that 
he is right in keeping them distinct. But this seems to 
carry with it a similar conclusion with regard to the Arabian 
T. evagore, which, if the foregoing be correct, cannot be con- 
sidered as the dry-season form of “ 7’ yerburii” or 7. daira. 
The only piece of evidence that seems to make against this 
view is the supposed breeding of 7. yerburii and 7’. evagore 
by Captain Nurse from similar larvee. Since writing the 
note in Trans. Ent. Soc. Lond., 1902, p. 195, I have been 
strongly disposed to think that the inference drawn from 
Captain Nurse’s account needed confirmation, and I was 
accordingly quite prepared to agree with Colonel Yerbury 
when [I found him urging in “Miss Sharpe's very useful 
“Monograph of the Genus Zeracolus” (p. 137) that “too 
much stress should not be laid on the fact that Captain 
Nurse bred a specimen of 7. evagore from a caterpillar 
taken with the larvae of 7. yerburw. ... T. evagore and 
T. yerburit may be seasonal forms [of each other], but 
* Proc. Zool. Soc., 1901, pp. 25, 26. 
