TRIOHIOSOMA LUCOtiUM. 23 



Trichiosoma biverrucatum, Ste., 1. c., 11, 9. 



Tenthredo vitellinse, Don., Brit. Ins., iii, pi. Ixxxviii, f. 3. 



Trichiosoma lucorum, Thorns., Hym. Sc., i, 23, 2 ; Cam., Fauna, 

 46, 1 ; Andre, Species, i, 27 ; Cat., 2,* 1. 



Cimbex lucorum, Htg., Blattw., 68 ; Br. and Zad., Schr. Ges. 

 Konig., iii, 257; Voll., Tijd. Ent., xi, 

 197, pi. viiij Ent., No. 138, 8, 1875. 

 lateralis, Voll., Tijd. Ent., vi, 65, pi. iv. 



Bronzy-black; the thorax of a deeper black than the abdomen, 

 which has a metallic gloss; knees, tibiae, and tarsi yellow to yellowish- 

 testaceous; wings somewhat yellowish, a fuscous border round the 

 apical margin; costa and basal nervures testaceous, stigma bluish- 

 black ; the nervures beyond the transverse median nervure are black. 

 The hair is long and thick over all the body; on the head it is black; 

 on the thorax and abdomen greyish, sometimes changing to yellowish ; 

 the hair on the femora is also grey. The latter are blue ; the middle 

 of the antennae is sometimes dull testaceous. 



Length 610 lines. 



Ab. Apex of abdomen above, at the sides, and more 

 or less of the ventral surface, reddish. ? and # . 



The long grey hair, nearly uniformly spread over 

 the thorax and abdomen, readily distinguishes this 

 common species. 



The larva, when young, has a greyish-white body, 

 the head blackish or fuscous, and obscured with a white 

 exudation ; the body is dusted all over with a white 

 powder, which obscures the colour beneath. 



When full-fed, the head is light brownish-yellow, 

 the mouth parts brownish, eye-spots black. Across 

 the vertex is a large dark brownish mark, which 

 occupies the greater part of it and extends down the 

 face. The legs are white, claws black, claspers light 

 glassy-green ; the elliptical spiracles are dark brownish- 

 black. The body is bright, rarely bluish-green ; the 

 skin is wrinkled and beset with white tubercles over 

 the legs and along the back; in the former region 

 there is one large tubercle with a smaller one beneath ; 

 the anal segment is free from tubercles. There can 

 scarcely be said to be a dorsal stripe, but when the 

 food canal is filled, it is noticeable as a slightly darker 

 green line. 



It feeds on birch during July, August, and September. 



Gampoplex pubescens, Rtz., Cryptus cimbicis, Tschek, 



