Lc'pidcrptera froiih the While Nih. 161 



Swinh., IVoiii T. daira, Klug. SiJccimens of T. ycrhtrrii, 

 however, collected at Lahej, Arabia, by Captain Nurse and 

 determined by Colonel Swinhoe, who presented them to 

 the Hope Collection, correspond closely with T. daira as 

 figured by Klug. .The locality given by Klug for T. daira 

 being " Arabia felix," it seems improbable that T. ycrlmrii 

 can be more than a synonym for T. daira, though Mr. 

 G. A. K.Marshall and Professor Aurivillius agree with Dr. 

 Butler in keeping them distinct. T. cvagtnx, Klug, which 

 is no doubt identical with T. saxcus, Swinh., is regarded 

 by Butler as the dry-season form of T. ycrburii. Whether 

 T. ijlyccra, Butl., be considered as a species, or as a mere 

 local race of T. antigone, there is no donbt that it is barely, 

 or perhaps not at all, separable from T. cvagorc. Hence, 

 if T. cvagorc bo the dry-season form of the Arabian T. 

 ycrhcrii (i.e. T. daira), T. glyccra should be the dry-season 

 phase of the form of T. daira occurring in tlie same locality 

 with itself, viz. on the White Nile. When, however, 

 Captain Dunn's collection arrived from the Bahr-cl-Zeraf 

 branch of that river, it was found to contain T. glyccra 

 in different seasonal phases, all of which were quite distinct 

 from the specimens of T. 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. Loafs 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. cvagorc, which, if the foregoing be correct, cannot be con- 

 sidered as the dry-season form of " T. yerhurii " or 2\ daira. 

 The only piece of evidence that seems to make against this 

 view is the supposed breeding of T. yerhurii and T. ccagorc 

 by Captain Nurse from similar larvaB. Since writing the 

 note in Trans. Ent. Soc. Lond., 1002, p. 195, I have been 

 strongly disposed to think that the inference drawn from 

 Captain Nurse's account needed confirmation, and I was 

 accordingly <;[uite prepared to agree Avith Colonel Yerbury 

 when I found him urging in Miss Sharpe's very useful 

 "Monograph of the Genus Teracolus" (i). 137) that "too 

 much stress should not be laid on the facti that Captain 

 Nurse bred a specimen of T. cvagorc from a caterpillar 

 taken with the larvse of T. yerhurii. . . . T. cvagorc and 

 2\ yerhurii may be seasonal forms [of each other], but 



* Proc. Zool. Soc, 1901, pp. 25, 20. 



