940 BR. A. 6. BUTLER OK BUTTERFLIES [Dec. 4, 



to where I took this specimen I saw a second flapping along over 

 the open in desperate haste, as if anxious to make the forest." 



3 . " This lovely insect can be captured practically in any 

 numbers on the Ruarka River these days. It is not uncommon 

 to fiud a dozen or more congregated on the mud feasting voraciously 

 on the moisture, and here they may often be trodden underfoot 

 before they will take wing." 



3 . " A curiously pale example, the shade of green being 

 distinctly different to the normal colour." 



2 . " Containing a few boiled-sago coloured spherical ova." 

 (B. C.) 



The only two females are of the usual (P. thersander) type : why 

 Prof. Aurivillius should think it possible that these may be 

 abnormal I fail to understand ; I think the green female resembling 

 the male (which is of great rarity) should rather be regarded as an 

 aberration. 1 . Why are all females of this abundant species so rare ? 



97. Papilio nireus. 



Papilio nireus, Linnaeus, Syst. Nat. ed. 10, i. p. 404 (1758). 



Nairobi forest, 5400 feet, March 18 ; Ruarka River, 5500 feet, 

 April 22, 1900. 



" Common in the forest, but it is not easy to secure perfect 

 specimens." (M. O.) 



98. Papilio demodocus. 



Papilio demodocus, Esper, Ausl. Schm. p. 205, pi. li. fig. 1 

 (1798). 



2 , Roromo, Kikuyu forest, Dec. 22, 1899 ; 6 6 , Nairobi forest, 

 April 5, 1900. 



Of the female Mr. Crawshay writes : — "This insect appears to be 

 identical in species with one which I have found to be both common 

 and easy of capture elsewhere, since it is of lazy flapping flight and 

 frequently stops to hover nervously over a flower or a wet piece 

 of ground. 



" Here, however, neither characteristic obtains, as it is of rather 

 rapid straight flight, rarely stopping to hover or rest, and 

 (frequenting forest such as this) proved really very difficult to take. 

 Daily I see perhaps a dozen or so, but this is the first which has 

 found its way into my net." 



Hesperiidje. 



99. Sarangesa synestalhenus. 



Antigonus synestalmenus, Karsch, Berl. ent. Zeit. vol. xxxviii. 

 p. 263, pi. vi. fig. 8(1893). 

 Nairobi plains, April 14, 1900. 



1 The male "P. thersander" to which Prof. Aurivillius refers may have been 

 P. euphranor. Why not ? 



