398 PERCY SLADEN TRUST EXPEDITION. 



minutely irrorated with blackish and with a transverse blackish line across prothorax. 

 Abdomen grey-white mottled, with pale fuscous, incisions of segments indicated in pale 

 fuscous. 



Legs greyish, mottled with blackish. Mid-tibia dilated apically with a scale-tuft and 

 emitting a pair of black-banded spurs, of which the inner is the longer. Posterior tibia 

 with dorsal scale-tufts at ^ and apex, emitting two pairs of long spurs, banded with 

 blackish at j and f of their length, and of which the inner spurs are the longer, and 

 proximal pair longer than distal. Posterior tarsi more or less blackish dorsally towards 

 bases of joints. 



Pore wing cleft into six linear segments ; first cleft to about ^, second nearly to 

 base, third to about f , fourth to about \, fifth to about J. Grey-white, irrorated and 

 mottled with dark fuscous : first segment with costa narrowly blackish on basal third, 

 cut by five approximately equal and equidistant blackish-fuscous, white-margined bars, 

 of which the first is before cleft and second and fifth do not reach hinder margin of 

 segment ; second to fourth segments crossed beyond -| by a broad blackish bar, preceded 

 and followed by white ; on fifth segment this bar is rather narrower, more inwardly 

 oblique, and is shifted basewards to slightly within ^ ; on sixth segment this bar is 

 moved still nearer the base ; second to sixth segments beyond black bar f nscous-grey 

 minutely irrorated with blackish, with two white patches, first broad and displaced 

 baseward on third segment, second narrow, subterminal, extreme tips of segments 

 blackish ; on sixth segment first white patch is followed by a small area of blackish 

 suffusion. Cilia on termen (tips of segments) whitish with a blackish central bar ; 

 within clefts fuscous, blackish opposite black bars and inner white bar, conspicuously 

 white opposite outer white bar and both white margins of black bar. 



Hind wing cleft into six linear segments : fuscous grey irrorated with blackish, cut by 

 about four equidistant narrow white bars ; cilia pale fuscous, white opposite, narrowly 

 blackish on either side of, white bars. 



Type ( <^ ) in Brit. Mus. 



Seven specimens from Mahe (Cascade Estate, 800-1000 feet, and Morne Blanc, 1000 feet) 

 and Silhouette (Mount Pot-a-eau, 1500 feet, in August and September). 



Of described species, 0. seychellensis appears to come nearest to 0. butleri, Wlgn., but 

 is easUy difi"erentiated by having only five costal bars, whereas butleri is stated to have 

 six (Kongl. Vet.-Ak. Porhandl. 1875, p. 130). 



Family PTEROPHORID-aB. 



(2) Buckleria defectalis,lV\k. 

 Pterophorus defectalis, Walker, Cat. xxx. p. 943 (1864). 

 Trichoptilus defectalis, Fletcher, Trans. Linn. Soc, ser. 2, Zool. xiii. (1909) p. 143. 



Seychelles. — Fourteen specimens from Bird and Dennis Islands. Not previously 

 recorded from the Seychelles group, although this species may reasonably be expected 

 to occur in any low, sandy, littoral area in these islands. 



