568 DB. A. G. BUTLER ON LEPIBOPTEBA [June 19, 



54. ZlZEEA KNYSNA. 



Lyctena knysna, Trimen, Trans. Eut. Soc. Lond. 3rd ser. vol. i. 

 p. 282 (1862). 



cJ $ , Mtoto wa Ande ; shores of Lake Baringo ; Njempo. 



55. ZlZEBA GAIKA. 



Lyccena galJca, Trimen, Trans. Ent. Soc. Lond. 3rd ser. vol. i. 

 p. 403 (1862). 



d 2 » Njempo. 



56. LtCjEnesthes amaeah. 



Polyommatus amarah, Guerin, Lefebvre's Voy. en Abyss, p. 384, 

 pi. 11. figs. 5, 6. 



d $ , Larabwal, Laitsipia. 



57. Ltc^nesthes keesteni. 



Lyccena l-ersteni, Gerstacker, Archiv fiir Naturg. 1871, p. 359. 

 n. 27 ; Van der Decken's Lep. Ost-Sibirieus, p. 373. n. 27, pi. xv. 

 fig. 5 (1873). 



One fragmentary male, from Mtoto wa Ande. 



I am at a loss to understand why Mr. Trimen regarded this 

 species as synonymous with L. laryclas ; the two forms appear to 

 me as distinct as any of the species in the genus and only show 

 a resemblance to each other on the upper surface ; but even there 

 the shade of deep blue in the males differs and the form is 

 strikingly different, the front wings of L. l-ersteni being elongate- 

 triangular, those of L. laryclas comparatively short in the costa and 

 consequently with the outer margin almost straight instead of 

 very oblique. Taking the entire outline of L. laryclas it roughly 

 represents a semicircle, whilst that of L. kersteni more nearly 

 approaches a triangle with truncated apex. 



58. Catocheysops osieis. 



Lycaina osiris, Hopffer, Ber. Verh. Ak. Berlin, 1885, p. 642. 

 n. 21 ; Peters's Eeise nach Mossambique, v. p. 409, pi. 26. 

 figs. 11, 12 (1862). 



No exact locality given ; probably Sabaki Valley. 



59. POI/TOMMATUS B^TICUS. 



Papilio bceticus, Linnaeus, Syst. Nat. i. 2, p. 789. n. 226 (1767). 

 c? $ , Ngatana in coitu • Kavaluki Valley, Ukamba. 



60. Castalitjs geegoeii, sp. n. (Plate XXXVI. fig. 3.) 



(S . Allied to C. calice and 0. cretosus ; above nearest to the 

 latter, the white area of the primaries still wider, the submarginal 

 spot crossed by the radials larger, but no white spots on the outer 

 border below it : secondaries above with the basal third greyish, 

 traversed by nearly straight blackish bars, partly visible through 

 the wing, and further obscured by long greyish hair ; outer border 



