266 [May, 



few pale spots, which are more or less confluent in the centre ; anterior margin 

 with long black spots of irregular length ; at the apex, between the bifurcation 

 of the 1st nerve, a somewhat trapezoidal white patch ; at the inner posterior 

 angle a black spot. Cuneus pale greyish-yellow, base narrowly pale, disc more 

 or less covered with small, brownish, confluent patches, which, as they reach 

 the apex, become black ; extreme apex pale. Membrane white, disc with 

 numerous minute, irregular, blackish spots and lines, more or less confluent, 

 varying in form in difi'erent individuals ; on the anterior margin, a little below 

 the apex of the cuneus, a small, blackish, somewhat oblique patch ; cell nerves 

 pale yellow, lesser cell nerve and margins black j large cell more or less black 

 at the base. 

 Sternum — Prosternum — xyphus, pale yellowish or greenish-yellow ; sides at the base 

 broadly black, above which, and near the base of the coxae, a longitudinal 

 brown-black line. Mesostemum almost entirely black. Metasternum on the 

 sides black. Legs pale yellow or greenish-yellow. Cowce, 3rd pair, at the base 

 on the outside, with a brownish spot. Thighs, 1st and 2nd pairs longitudinally 

 spotted with black, thickest at the apex, almost forming two lines extending 

 throughout their entire length ; 2nd pair, at the apex on the under-side, with 

 two oblique, transverse, pale bands j 3rd black at the apex, and spotted with 

 black along the upper and under-sides ; before the apex an oblique pale band. 

 Tihice, 1st pair with three broad black rings, — one a little way from the base, 

 another at the apex, and one nearly midway between the other two ; on the 

 outside, a very narrow black line extends from the base to the second black 

 band ; on the inside, at the base, a blackish spot ; 2nd pair with three broad 

 black rings, — the first about its own breadth from the base, third the same 

 distance from the apex, the second nearly midway between the other two ; 3rd 

 pair with three broad black bands, — the first at the base, twice as broad as 

 either of the other two, the second a little beyond the centre, and the third a 

 little before the apex, which last is narrowly black; the first band only half 

 encircles the limb j on the outside, a narrow, somewhat interrupted black line 

 extends from the base to the third band; all the tibiae with longish, fine, 

 somewhat spinose, pale brown hairs. Tarsi, 1st joint brown, 2nd yellow, 3rd 

 black. Claws piceous. 



Abdomen greyish or greenish-yellow ; margins of the segments, on the sides, more 

 or less broadly black. Length 3i lines. 



Hitherto very scarce with us, and, even now, only taken singly on 

 the trunks of poplars, generally in company with P. distinctus. It lies 

 close in the cracks of the bark, and in nearly every case is found with 

 the head downwards. It has occurred at Lewisham, Blackheath, and 

 Darenth, in August and September. The Eev. T. A. Marshall has 

 taken two examples, — one at Cheltenham, and the other in the New 

 Forest. The ticket attached to the former says, " On an oak-tree in 

 November." At Eannoch, by Dr. Buchanan White, in the autumn. 



Note. — It is difficult to describe the form assumed by the dark 

 markings on the membrane in this and some of the other sj)ecies, as 

 they are so various ; and the best idea which occurs to us, to render it 

 intelligible, is that of colour being spread upon a greasy surface. 



