116 SUB-GENUS PHYLLCECCJS. 



the oak, which become swollen at one end into a 

 spindle-shaped enlargement ; and this swelling either 

 becomes dried and withered, or may remain green ; 

 exteriorly the part inhabited by the larva becomes 

 covered with little knob-like elevations. The larva spins 

 a thin, semi-transparent cocoon, and quits the branch 

 by a hole in the basal part of the swelling. Giraud 

 records Ephialtes inanis, Grav., as a parasite. It is not 

 an uncommon species in the South of England in early 

 summer in gardens. Billups has reared it from the 

 stem of a willow, the branch not being in any way 

 enlarged. 



The Tenthredo cynosbati, Lin., is not this species, but 

 a c? Pimpla of the examinator- group, probably P. strigi- 

 pleuris, Thorns., cf. Holier, Entom. Tidskrift iv, p. 

 91, 1883. 



Continental distribution: France, Holland, Germany, 

 Italy. 



Sub-genus PHYLLCECUS. 



Antennae twenty-five to twenty-eight jointed, thick, sub- 

 filiform, thin at base, becoming gradually thicker 

 towards the apex; the third joint a little longer 

 than fourth. The basal two joints of maxillary 

 palpus nearly equal, fourth but a very little longer 

 than sixth. Prothorax not transverse. Hind tibice 

 with one spine. 



1 (2) Pronotum yellow, the sides of abdomen with six or seven broad 



yellow bands, the fourth segment banded with yellow. 

 with two yellow marks on vertex, coxse and femora yellow. 



Linearis. 



2 (1) Pronotum entirely black, sides of abdomen with three small 



yellow marks, the fourth segment not yellow. $ vertex 

 without yellow, coxae and femora black. Satyrus. 



