NBMATUS VESIOATOll. 183 



number of black spots and points, these segments being 

 deeper, often violet in tint. Oerci short, black. Head 

 shining brown, a darker transverse streak between 

 the eyes ; above these the head is darker along the 

 sides. At the last moult the larva becomes brownish- 

 yellow ; the single cocoon is spun in the earth or 

 attached to the leaf. 



Thomson says of his N. Westermanni that it lives in 

 bladder-like galls on willow leaves. 



Rare. Among osiers along the Severn, near Glou- 

 cester. 



Continental distribution : Sweden, Germany. 



90. NEMATUS VESIOATOR. 



Vol. I, PL V, fig. 8, Gall; Vol. II, PL III, fig. 7, ? ; 

 PL XXV, fig. 7, Saw. 



Nematus vesicator, Bremi, S. E. Z., 1849, p. 93 : Br. and Zad., 



Schr. Ges. Kdnig., xvi, pi. 6, f. 12 ; 

 1. c.. 327, 72 ; Cam., Fauna, 43, 53 ; 

 Andre, Species, i, 161 ; Cat., 18, 

 96. 



helicinis, Brischke, S. E. Z., 1850, 409; ? Thorns., 



Hym. Sc., i, 162, 95. 



lugunensis, Yoll., Tijd. Ent., xiv, 243, pi. Ixv, f. 1. 



crassipes, Thorns.; Hym. Sc., i, 162, 96. 



Black, shining, mesonotum punctured ; mouth, tegulse and pronotum 

 pallid- testaceous, orbits of eyes, sometimes the scutellum, the belly and 

 apex of abdomen more or less above, and legs, luteous. Antennae as 

 long as abdomen, black, reddish beneath, the third and fourth joints 

 equal. Calcaria short, thick, claws bifid. Wings hyaline, costa and 

 stigma pale luteous. 



The <J has the body darker coloured, and the stigma obscure 

 fuscous. 



Length 2 2 lines. 



The larva lives in large, oval, or oblong galls on 

 Salix helix, 8. purpurea, and 8. laurina. They are 

 closely pressed to the midrib, but do not, as a rule, 

 overlap the edge of the blade, but sometimes they are 

 placed so close to the foot-stalk as to project over it. 



