304 



Insect Pests. 



Eetz.; Xcmatu^ septentrional i^, Olivier; Xcmatns latimn:, Yillaret 

 CVa'.s//'s scptcntriinicdix, Leach ; t'/v,'x«.s /a^/'Ti/.v, Stephens. 



LiFE-HlSTOEV AIvD HABITS. 



The sawfly appears in May and June, usually at the beginning 

 of the latter month. 



It varies in length from a little less to sliglitly more than i inch. 

 In colour it is black, shiny and covered with dense pubescence ; the 



FIG. iOiA.— THE NUT ,^A\VFLV {Cro'sl!^ si'pteutfi^nKih'.^. Linn.). A, adult: B. hirvio. 



abdomen has the two basal and two or three apical segments black, 

 the rest brick-dust red. The legs are peculiar, the posterior pair 

 being long, tlie apex of tlie tibi;e being dilated, flattened and hollowed 

 on the inner side, metatarsus also dilated and flattened on the upper 

 side (which is curved), and tlie metatarsus is much longer than all 

 the other segments put together ; the second segment is as long as 

 the two succeeding. In colour' the legs are black, the cox;e and 

 trochanters white, also the base of the hind femora, anterior tibi;v and 

 tarsi, and half the po,sterior tiliia' mainly white; the apex of the 

 anterior femora lirown beneath, anterior tibi;e and tarsi reddish at 

 the ajie.x, base of mid tarsi reddisli. 



The male differs from tlie female in ha\ing the femora reil, the 

 apex of the posterior femora lilack above ; mouth and teguLv reddish. 

 The femora are often jet black. Wings hyaline, but coloured on part 



