568 Uli. A. G. BUTLER ON LEPIDOPTERA [June 19, 



54. ZlZERA KNYSNA. 



Lyccena knysna, Triinen, Trails. Ent. Soc. Loud. 3rd ser. vol. i. 

 p. 282 (1862). 



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



55. ZlZERA GAIKA. 



Lyccena gaUca, Triraen, Trans. Ent. Soc. Loud. 3rd ser. vol. i. 

 p. 403 (1862). 

 <5 2 , Njeinpo. 



56. Lyc.exestiles amarah. 



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

 pi. 11. figs. 5, 6. 



J $ > Larabwal, Laitsipia. 



57. Lyoenesthes kersteni. 



Lyccena Tcersteni, Gerstacker, Archiv fiir Naturg. 1871, p. 359. 

 n. 27 ; Van der Dec-kens Lep. Ost-Sibirieus, p. 373. n. 27, pi. xv. 

 fig. 5 (1873). 



One fragmentary male, from Mtoto \va Ande. 



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

 species as synonymous with L. larydas ; 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 eveu there 

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

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

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

 consequently with the outer margin almost straight instead of 

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

 represents a semicircle, Avhilst that of L. hersteni more nearly 

 approaches a triangle with truncated apex. 



58. Catochrysops osiris. 



Lyccena 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. Polyommatus bjeticus. 



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

 d $ , Ngatana in coitu ; Kavaluki Valley, Ukamba. 



60. Castalius gregorii, sp. n. (Plate XXXVI. fig. 3.) 



cJ . Allied to C. calice and C. en tosvx ; 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 : secoudaries 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 



