PERICOMA. 239 



joints, gradually shortening to the last one, which is styliforra. 

 In the female the flagellutn has fourteen ovate joints, each with 

 a rather thin verticel of hairs ; first joint only barely longer than 

 the second, without spines. In the male the lace and the anterior 

 part of the thorax bear nearly white bristles which become 

 almost scale-like. Abdomen : geuitalia of male somewhat different 

 from the usual generic type ; the basal joint of the upper pair of 

 claspers being large and broad, sickle-shaped, bearing about 

 twenty spatulate spinules on its distal two-thirds, whilst the 

 second or terminal joint takes the form of cylindrical chitinous 

 filaments coiled in a spiral. The genital apparatus in the female 

 consists of a single, horny, pointed, bare appendage of moderate 

 size, projecting rather prominently. Legs pale yellowish white, 

 femora distinctly curved, especially the fore and hind pairs, the 

 amount of curvature variable ; the femora with some close-lying 

 small scales. The femora and tibiae are covered with long, pale 

 yellowish grey, bristly hairs ; the tips of the tibiae having a circlet 

 of rather elongate, whitish scaly bristles, with some short black 

 bristles intermixed ; the tarsi are covered with black scales and 

 bristly black hairs. The base of the metatarsus, and of the 

 following joint, and the tip of the last joint are covered with 

 small, cream-white scales. Wings dark grey. The lower prong 

 of the 4th longitudinal vein springs at right angles from the 

 upper, and then forms a second right angle, bearing a distinct 

 appendix at that spot, directed backwards. The 4th longi- 

 tudinal vein forks a little before the fork of the 2nd, which 

 itself is placed just before the centre line of the w r ing. The 

 veins, which are very distinct, all bear the usual double row of 

 suberect hairs, directed forwards and backwards, and at the tip 

 of each vein is a small bunch of stronger bristly hairs; the inter- 

 vening space (especially on the hind border) being nearly clear, 

 thus giving the border of the wing the appearance of bearing 

 alternate black and white spots. The hairs are in the main black, 

 but those on the proximal half of the disc (except those in the 

 immediate vicinity of the third vein) are distinctly more erect 

 than the others, and are distinctly grey. In the centre of the wing 

 are short rows of quite white short bristly hairs placed at irregular 

 intervals along the veins, these hairs being intermixed with black 

 ones towards the base of the wing. A thick row of bushy, long, 

 black bristly hairs on nearly the whole length of the seventh 

 vein. Wing-border with a fringe of black hairs which is rather 

 short on the apical half, longer on the basal half of the costa, 

 and longest and thickest on the basal half of the posterior border; 

 it appears lighter or darker according to the direction of the light 

 falling on it. Towards the end of some of the veins are a few 

 silvery white, irregularly placed, elongated scales. 



Length l|-2 millim. 



Described originally from eight males and ten females (the 

 former as sinnicornis, the latter as appendiculata, with a surmise 

 that they represented the sexes of a single species) ; the specimens 



