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 apes, between the bifurcation 
of the 1st nerve, a somewhat trapezoidal white patch ; at the inner posterior 
angle a black spot. Cxmeus 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 dififerent individuals ; on the anterior margin, a little below 
the apex of the cuneus, a small, blackish, somewhat obhque patch ; cell nerves 
pale yellow, lesser cell nerve and margins black ; large cell more or less black 
at the base. 
Sternum — Prosf ermtHi—xyphus, pale yellowish or greenish-yellow ; sides at the base 
broadly black, above which, and near the base of the coxdo, a longitudinal 
brown-black line. Mesosternum almost entirely black. Metasternum on the 
Bides black. Legs pale yellow or greeuiah-yellow. Coaice, 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 ; 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 ; on the outside, a narrow, somewhat interrupted black line 
extends from the base to the third band; all the tibia? 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 iu 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 
Porest. The ticket attached to the former says, " On an oak-tree in 
November." At Eannoch, by Dr. Buchanan White, in the autumn. 
NoTB. — It is difiicult to describe the form assumed by the dark 
markings on the membrane in this and some of the other species, 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. 
