240 PSYCHODIDiE. 



being from Kurseong, 5. vii. 08 (Dr. Ann and ah). The species is 

 quite common along the Himalayas from their base (Siliguri) to 

 an altitude of at least 9000 ft., and occurs from early in May to 

 October. 



The Indian Museum possesses a good series bearing the 

 following data :— Darjiling, 7000 ft., 2. x. 08 and 2(5-28. v. 10, 

 common (Brunetti) ; 6-11. viii. 09 (Jenlins^ Paiva) ; Kurseong, 

 5000 ft., iii., vi., vii., ix. (Annondale, Lynch, Gravely) ; Siliguri, 

 base of Darjiling Hills, 18-20. vii. 07 (Hodyart) • Simla, v., on 

 windows (Annandale) ; Phagu, 9000 ft., 11. v. 09 {Annandah) ; 

 Naini Tal, 6000 ft., 2. vi. 09 (Hodgart). 



Types in the Indian Museum ; cotypes, J and ^ , in my 

 collection. 



This is the only species in the family known to me in which 

 such a striking sexual difference is found. Taken in consideration 

 with the appendiculation of the 4th longitudinal vein near its 

 base, a separate subgenus might be formed for it, but slight 

 appendices occur occasionally in other species when the basal 

 section of a vein forms a sharp angle ; in Pericoma maryinhwtata, 

 for example, it is I think constant at the basal angle of the 

 3rd vein. 



171. Pericoma margininotata. Brim. 



Pericoma margininotata, Bruniitti, Eec. Ind. Miis. ii, p. 381 (1908) ; 



id., o^;.«Y.iv, p. 304(1911). 

 Var. Pericoma bella, Brunetti, q/^. cit. ii, p. 383 (1908). 



S $ . Ground-colour of thorax blackish brown, of abdomen 

 blockish, both covered with thick, long, pale yellowish grey, bristly 

 hairs, plentifully intermixed on the thorax with black hairs, and 

 likewise, to a less degree, on the base of the abdomen. The hairs 

 on the thoracic dorsum show a tendency to be arranged in fan- 

 shaped sets. On the abdomen they are arranged in a thick row 

 of long ones on the posterior border of every segment, with a 

 shorter, erect row in front of them. Pleurae light to dark 

 mahogany brown, bare, or nearly so. 



Head : eyes bronze, with large facets. The antennae have two 

 large basal joints covered with short white scales and surrounded 

 by a cluster of longer ones ; the second scapal joint subglobular, 

 a little more than half as long as the first, which is cylindrical, 

 twice as long as wide ; flagellum of fourteen small globular or 

 subconical joints of equal size, last one conical, each with a circlet 

 of a few long black hairs, and more numerous short white ones. 

 Sometimes the last joint is constricted, giving the appearance of 

 a 15-jointed flagellum. Abdomen : genitalia of male with superior 

 appendages consisting of a short, stout, cylindrical basal joint, 

 and a distal one whic-h is shaped like a scorpion's sting, consisting 

 of a basal bulb, and a slightly coiled, tube-like prolongation of 

 about the same length. Inferior appendages arising from a broad, 

 rather short basal plate, than which they are considerably larger ; 



