1897.] 119 



tow-coloured band from the radius to tlie postical nervure.and the like-coloured tuft 

 before the end of the axillar iiervure, mark the endings of ranks of the bristling 

 hair, which, as in P. cahiginosa (28), is distinctly parted from the exterior smoother 

 hair ; the hairs immediately exterior to the parting lie hardly so close together as in 

 that species, and hence produce a less distinctly defined, dark, transverse band ; the 

 small patch of the lighter colour at the base of the wing, extending outwards to 

 about the fold of deflection, and to the end of the basal cells, matches with the long 

 dorsal hair of the abdomen, includes the fringes of the alulae and the fringe of the 

 costal radicle or callus, while, beyond the fold, the costal fringe remains dark ; the 

 broad, dark haired interval between this patch and the light haired band is backed 

 by scales on the under-side in the male, but by flattened hairs in the female. 

 Indumentum of the head, palpi, scapes of the antennae, and the bases of the long 

 hairs surrounding, on the anterior portion of the notum, a rounded patch of elongate, 

 appressed, glossy white scales, blackish or rich sooty-brown in the male ; the re- 

 maining pubescence of the notum from many standpoints is of a light colour, 

 slightly browner than that of the dorsum in this sex ; but in the other sex all 

 matches in colour with the dorsal pubescence from the vertex of the head to the 

 metanotum. Hair of the flagellum of the antenna warm sepia-brown. Ventral 

 pubescence and indumentum of the legs sooty-brown or brownish-black ; the legs 

 ■without lighter markings, but the tibial and tarsal fringes glossed from some stand- 

 points with tow colour. 



Beneath the wings in the $ , for some distance from the wing-roots, all of the 

 nervures ai-e clad with linear-obovate or linear scales, and some are distributed along 

 the inner edge of the fringes at the commencement of both of the margins ; long, 

 acuminate, flattened hairs succeed the scales, and then follows hair of ordinary 

 texture, commencing nearly beneath the inner border of the light haired band. In 

 the ? the scales are more restricted in their outward range. Season, May, June, 

 and August. 



30. Pericoma betisenua, Etn. 

 P. revisenda, ante, 2nd ser., vol. iv, 129, and vol. v, pi. iii, P. 30 

 (detail). 



Pobrachial bifurcation distinctly interior to the shortest line drawn from the 

 axil of the radial fork to the end of the axillar nervure. General hue of the wings 

 Tarying, with change of illumination, from light greyish-brown to fawn colour; 

 costal fringe dense, and from some positions browner beyond the fold of deflection 

 than the disc, while the fringe of the costal root or callus becomes blackish towards 

 the roots of the hairs, the disc appearing so thinly hairy as to present the aspect of 

 an iridescent wing, with brown fringes and blackish markings, blue predominating in 

 the iridescence ; from other standpoints, the fringes partly or entirely match in 

 colour with the disc, or the bristling hair can be made to match with the lighter 

 hair of the thorax ; the parting between the bristling hair and the smoother hair is 

 less manifest than in P. caliginosa (28), and the pair of blackish spots at the parting 

 lie in the smoother hair. From certain positions the wing-margin is defined by a 

 thin dark line, set off by a light gloss on the short hairs at the base of the posterior 

 fringe. Pubescence of the head and thorax light fawn colour, or whitey-brownish- 

 grey ; that of the abdomen readily assumes the same tint, although changing as 



