A MONOGRAPH 



OF THE 



BEITISH 



PHYTOPHAGOUS HYMENOPTERA, 



VOL. III. 



TENTHREDINID^E. 



Tribe CIMBICINA. 



Antennae 6 8-jointed, short, the third joint much longer than the 

 rest, the last, the last two, or the last three forming a well-defined club, 

 which is clearly separated from the preceding joints. Wings with two 

 radial and three cubital cellules ; the first cubital receives both or only 

 one of the recurrent nervures (Amasis). Transverse basal nervure 

 received considerably before the stigma; the transverse median is 

 usually received very near to, or is quite joined to it. Posterior wings 

 with two median cellules. The accessory nervure is continued to the 

 edge of the wings, and is united to the anal by a short transverse ner- 

 vure. Head broad and swollen behind, much narrower in front, so 

 that the eyes are generally placed more in front than at the sides ; the 

 eyes are small and oval as a rule. Pronotum with a semicircular 

 emargination on its hind border. Episternum of mesothorax large, and 

 separated from the mesosternum by a deep groove, which is directed 

 rather to the front than very obliquely downwards. Prosternum large. 

 Abdomen broad, rounded behind, its sides acute, the back arched, the 

 ventral surface flat, or semi- concave. Mandibles large, deeply 2- or 

 3-dentate. Saw scarcely, if at all, projecting, broad, the apex curved, 

 round, and the sides bear little dentated bead-like projectings. Patellee 

 well developed ; spurs often membranous at apex. 



The clypeus is either moderately large and the 

 labium small, as in Cimbex, or it may be small and the 

 latter larger and moveable, as in Clavellaria. The 

 mandibles are large, especially in the males of Trichio- 



VOL. in. 1 



