176 DR. A. D. IMMS ON 



the ventral process already referred to. The distal joints of both cerci are elongate and 

 cylindrical, and similar one to the other. 



Coloration. — Seen from the dorsal side, the head, together with its appendages, the 

 legs, the terminal and penultimate segments of the abdomen, and the cerci except at 

 their apices, vary in coloration from deep brown-black to black, with pruinose reflections. 

 The prothorax varies from chestnut-brown to black, but in most specimens it is usually 

 brown-black in colour. The remaining thoracic and abdominal segments are dark 

 pruinose-brown. . The claws of the feet are yellowish-white, but fuscous distally. The 

 articulations between the joints of the legs, of the tarsi except the first pair, of the 

 antenna?, and of the labial and maxillary palpi are cream-coloured. The ante-clypeus is 

 usually light brown and very conspicuous for that reason, and the apices of the cerci are 

 yellowish-white or cream-coloured. The intersegmental regions between the head 

 and the prothorax, and between the prothorax and the mesothorax are well defined, 

 membranous, and yellowish-white in colour. The pleurae of the metathorax and the 

 fist eight abdominal segments are similarly membranous, and form a whitish sinuous 

 line along each side of the body, but are less conspicuous than in the female. 



Ventrally the coloration is very much the same as it is dorsally. The cervical region 

 is a very conspicuous, yellowish-white, membranous area, and the region between the 

 prothorax and mesothorax is similarly membranous. 



The wings are fuscous, striped with a series of longitudinal hyaline areas (PL 37. fig. 1). 

 These areas have a definite arrangement with reference to the various longitudinal veins, 

 and are, furthermore, devoid of the longer setae which are distributed over the rest of the 

 wings. As already mentioned (p. 171) the newly formed wing, after the last ecdysis, is at 

 first hyaline, the darkening and full chitinisation taking place subsequently, leaving only 

 these longitudinal areas unaltered. The latter remain unmodified and undarkened through- 

 out life. In this connection it is worthy of note that Wood-Mason (1883, p. 633) suggested 

 that these areas represent the original hyaline colour of the wings ; and it gives me great 

 pleasure in being able to confirm his suggestion. The hyaline areas are disposed in the 

 following manner: — (a) An extremely narrow strip bordering both the anterior and 

 posterior radial lines (p. 171) ; {b) a prominent area situated midway between the two 

 branches m^ and m„ of the median vein ; (c) a short area lying between the two veins m 2 

 and m s , formed by the division of the lower branch of the upper stem of the median vein ; 

 (d) a very long and conspicuous area situated about midway between the two stems m 

 and m i of the median vein and extending outwards so as to almost reach the outer margin 

 of the wing ; (e) a very similar area situated between «i 4 and the cubital vein ; (f) one 

 or two very short lines lying within the fork formed by the bifurcation of the cubital 

 vein ; (g) a short area between the much thickened stem of the cubital vein and the 

 anal vein. In those cases where the lower stem m A of the median vein is bifurcated, an 

 additional hyaline area is present between the two branches of the fork. This, however, 

 is a rare variation. At the points where certain of the transverse veins cross the hyaline 

 areas (PI. 37. fig. 1) they become bordered with a minute hyaline strip, producing the 

 appearance of cross-pieces on the wing-membrane. 



