Monograph of the genus Catochrysops Boisduval. 289 



Neochrysops leucon Mabille. Plates XV, figs. 1, la; 

 XXVI, fig. 1. 



Lyeaena leucon Mabille, Pet. Nouv. Ent., 2, p. 289 (1879, 

 January) ; id. idem Hist. Mad. Lep., i, p. 226, PI. 29, 

 figs. 5 to 6« (1885-7). 



Castalius azureus Butler, Ann. and Mag. N.H., iv, p. 230 

 (1879, September). 



Cupido leucon Auri villi us, Rhop. Aethiop., p. 377 (1898). 



c?. Upperside, both wings brilliant metallic pale silvery blue, 

 with narrow, black margins. Primaries with a black spot closing 

 the cell and a broadish black apex. Secondaries with a smallish 

 black subanal spot and a fairly stout tail. Underside, both wings 

 pure white with large deep black spots. Primaries with a spot 

 closing the cell ; the postmedia.n series consisting of three very 

 oblique spots with a fourth below them, vertically below which 

 shifted well inwards is a fifth, rather longer spot, a series of six 

 narrow subterminal dashes and a series of six half-round smallish 

 terminal spots. Secondaries, with three large subbasal spots below 

 each other, an inner marginal narrow one nearer the base, a rectan- 

 gular one closmg the cell; postmedian series irregular; cell spots 

 large, two below the costa, the second shifted outwards, the third 

 and fourth shifted far out, the fourth being wedge-shaped, fifth 

 spot shifted well inwards, sixth long inwards again, seventh well 

 outwards; subterminal and terminal series as in the primaries, 

 with the addition of a subanal and anal spot with metallic scales 

 and a little yellow above the subanal spot. 



$. Upperside. Primaries brown, the basal three-quarters to the 

 upper margin of the cell white. Secondaries white, costa to vein 8 

 brownish, a subterminal row of internervular broAvn dashes followed 

 by a terminal row of blackish spots, a subanal spot with yellow 

 internal edging. Underside like the male except that in the 

 primaries there is no postmedian series of spots, and the spots are 

 not elongated in the secondaries. 



Expanse, (J 20; $ 22-23 mm. 



Hab. Madagascar. 



Types in Mabille's collection; Butler's type azureus in 

 the "Brit. Mus. 



Genitalia with the harpagines of the longish arm-like shape wide 

 at the base and tapering rapidly narrow, but widening slightly 

 again beyond the middle, at a quarter from the apex narrowing and 

 excised into a sickle -like tip; the sickle being armed with dentations 

 on the exterior ; the bristles are long and strong ; the aedoeagus is 



