178 THE GROUP OF RUMIOIS AND SCOTASPIS. 



are annulated with black. The sutures of middle lobe 

 of mesonotum are often yellow, the black on base of 

 abdomen may exist only on the basal segment ; the 

 sheath is long and densely pilose. 



The larvaB live in the more or less rolled-down 

 leaves of Salix viminalis, S. cinerea, 8. aurita, &c. 

 The edges are not much rolled down; they eat 

 first the epidermis, then holes in the surface, and 

 latterly may even eat along the edge of the leaf. In 

 colour they are green, lighter along the sides over the 

 legs, of a deeper and bluer tint along the back ; the 

 skin is wrinkled transversely, has lighter- coloured 

 spots, and is shortly-haired, the hair on the anal seg- 

 ments being longer. The head is shining, light brown- 

 ish, irregularly marked with deeper tints on the top ; 

 mouth brown. When young they are of a clearer 

 green, the head brown, darker on the top. The cocoon 

 is spun in the earth, 



Found in the autumn. Not common. Clydesdale, 

 Worcester, Gloucester. 



Sweden, Germany. 



XIX. THE GROUP OF RUMIOIS AND SCOTASPIS. 



Small species of not more than two and a half lines 

 in length, with black bodies ; the abdomen more or less 

 yellow, legs reddish-yellow, stigma yellow or whitish- 

 yellow, wings hyaline, or more rarely yellow ; antennce 

 generally entirely black. 



This group does not differ much from N. xanthogaster, 

 &c., the most conspicuous distinction being that the 

 back of the abdomen is, except very rarely, entirely or 

 almost entirely black. From N. leucostictus and N. 

 vacciniellus the species are only separable by the reddish- 

 yellow colour of the legs, and by the ventral surface 

 of the abdomen being yellow or reddish. 



