A MONOGRAPH 



OF THE 



BRITISH 



PHYTOPHAGOUS HYMENOPTERA. 



VOL. II. 



Tribe (sub-family] NEMATIJSTA. 



In this tribe the antennae are 9-jointed, the third and fourth joints 

 subequal, the third rarely longer than fourth, usually slender and 

 longish, often thicker, shorter, and more compressed with the males. 

 Generally there is only one radial cellule, but there are two in 

 Dineura and Hemichroa ; there are either three or four cubital cellules, 

 of which the second and third receive each a recurrent nervure in 

 Cladius, and the first both in one section of Nematus (= Pristo- 

 phora), or the second both with the most of the species, the second also 

 receiving both in Camponiscus. The lanceolate cellule is contracted 

 in Cladius and Camponiscus, petiolate in the other genera. In the 

 hind wings there are always two median cellules, and the accessory 

 nervure is appendiculated a little beyond the middle. The transverse 

 basal nervure is always received at a distance from the cubital. The 

 body is elongated as a rule, the abdomen becoming narrowed towards 

 the apex ; its cerci are usually long. The spurs seldom reach to the 

 middle of the metatarsus. 



The larvse have never more than twenty legs. In 

 form and habits they differ much. The cocoon is either 

 single or double ; the pupa offers no striking pecu- 

 liarity. 



VOL. n. 1 



1O 



