NEW AFRICAN geometrid-t;. 293 



Bitye, Ja River, Cameroons. Type in coll. L. B. Prout. A 

 second example, from Uganda, in coll. Brit. Mus. 



Perhaps related to Acidalia diffiisizona, Hampson, Proc. 

 Zool. Soc. Lend. 1910, 478 {Craspedia). 



Subfam. Larentiin^. 



Onychia olbia, sp. n. 



2 , 30-32 mm. Head and body (with palpus, antenna, &c.) 

 ochreous, more or less mixed with pink, and finely irrorated with 

 darker scales. Palpus long. Antennal ciliation slightly longer than 

 in the typical members of the genus, but lacking the longer bristle 

 at end of each joint. Fore wing with costa slightly more arched 

 than is typical, termen slightly more oblique, rather straight ; bright 

 yellow ochre, somewhat mixed with browner scales, and traversed 

 by numerous wavy lines ; two in basal patch brown, accompanied by 

 one or two weaker ; three in intermediate area, more reddish and 

 very much fainter ; three (brown) in the proximal and three in the 

 distal part of the rather broad median band, the proximal three 

 slightly and the next two markedly angled below costa, the sixth 

 (margining the band distally) dentate inwards on sc^ bluntly bilobed 

 on either side of m^ and gently incurved anteriorly and posteriorly 

 to these lobes, accompanied distally throughout by a very fine white 

 line ; two in the outer intermediate area reddish, strongly lunulate- 

 dentate, the proximal one much interrupted ; median band much 

 clouded with pink, leaving costal, central and inner marginal patches 

 more or less of the ground colour ; terminal area darkened, being 

 composed of a blend of ochreous, fuscous and pink scales, a few vague 

 whitish spots on veins indicating the position of the subterminal 

 line ; discal spot blackish, elongate, closely following the third median 

 line; terminal line olive-brown, interrupted at the vein-ends; proximal 

 half of fringe concolorous with terminal area, distal half whitish 

 mixed with pink, the halves separated by a thick olive-brown line. 

 Hind wing silky whitish, with a very few brown scales, some slight 

 pinkish marks on inner margin, and a fine, sinuous, brown post- 

 median line from inner margin at three-fourths, fading out beyond 

 E^; cell-spot weak, small; terminal line as in fore wing; fringe 

 pinkish. Under side of fore wing dirty whitish, irrorated with 

 brown ; base, costal and distal margins darker, apical area more 

 broadly so ; a brown spot on costa before one-foui'th (midway between 

 basal and median bands of upper side) ; cell-spot strong, elongate, 

 followed by three brown lines, the first two nearly straight, the third 

 darker, angled on r^ Under side of hind wing more uniformly 

 mottled with the ochreous, olive-bi'own and pink scales, palest 

 between postmedian line and terminal area ; cell-spot and postmedian 

 line much darker and stronger than above, the latter reaching across 

 wing ; fringe concolorous with terminal area. 



Near Johannesburg (Edmund A. Bacot). Type and a pre- 

 cisely similar but somewhat worn female in coll. L. B. Prout, 

 kindly presented by Mr. A. Bacot. 



Probably nearest to Omjckia arenaria, "Warr., Nov. Zool. ix. 



