ENEMIES OF APHIDES. 257 



The Head. 

 The head is of average proportions, with a prominent labrum, 

 of a black or dark colour as far as a line drawn across behind the 

 eyes. Behind this is a band of lighter colour, greenish grey to 

 yellow. The surface is clothed with fine hairs, and a number of 

 long, coarse black hairs, almost bristle-like in texture, are very 

 obvious. In common with the other genera of this family, the 

 ocelli are wanting ; but the perfect development of the eyes is a 

 characteristic feature. The eyes stand out on either side of the 

 head like two spheres attached to it by about two-fifths of their 

 surface only ; the facets are large and very clearly defined, and 

 regular to the edges of the organs, and on the posterior side, where 

 in many species the lenses fade and the pigment is deficient, both 

 are in P. arbustorum as sharp and perfect as elsewhere, except on 

 a small, clearly-defined, semi-circular space next the pronotum, 

 where they are altogether absent. 



The Rostrum. 

 This organ, which is four-jointed, differs little from that of 

 C. lanariiis, already described, but the basal joint is more volumi- 

 nous and of a more chitinous texture. 



The Thorax and Wings. 

 These structures also present much the same features as in the 

 Capsid already described. The Hemelytra are considerably longer 

 and narrower, and are clothed, as to the coriaceous part, with 

 short, fine black hairs, which frequently appear silvery in reflected 

 light. The membrane is dark, with a translucent spot behind the 

 cuneus. 



The Legs. 

 The most characteristic features of the species are to be found 

 in the femora and tibiae, the former of which are always outlined 

 and sometimes spotted with black or very dark brown. The 

 tibiae are pale, usually ochreous, and provided with a number of 

 fine black spines, each of which rises from a patch of brown upon 

 the integument ; the extremities of the tibiae and the whole of the 

 tarsi are also black. 



