940 DR. A. 6. BUTLER ON BUTTERFLIES [Dec. 4, 



to where 1 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 find 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." 



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

 distinctly different to the normal colour." 



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

 (R. C.) 



The only two females are of the usual (P. tliersander) 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 l . Why are all females of this abundant species so rare ? 



97. Papilio nireus. 



Papilio nireus, Linnaeus, Svst. Nat. ed. 10, i. p. 464 (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." (B. C.) 



98. Papilio demodocus. 



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

 (1798). 



$ , Roromo, Kikuyu forest, Dec. 22. 1899 ; c? c? , 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 flappiug 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 synestalmenus. 



Antic/onus si/nestalmeaus, Karsch, Berl. ent. Zeit. vol. xxxviii. 

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

 Nairobi plains, April 14, 1900. 



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

 P. euphranor. Why not ? 



