GENUS CIMBEX. 5 



They are usually dusted over with a white exudation 

 and feed on willows, birch or alder. 



Synopsis of Species. 



1 (2) Blotch large ; labrum small ; clypeus incised, larger than labrum. 



Cimbex . 



2 (1) Blotch abaent; labrum large; clypeus smaller than it. 



3 (4) Posterior coxae widely separated; antennas with five joints before 



the club; posterior femora toothed; labrum and clypeus 

 black. Trichiosoma. 



4 (3) Posterior coxae continuous ; antennae with four joints before the 



club ; posterior femora simple ; labrum and clypeus white. 



Clavellaria. 



Genus CIMBEX. 



Crabro, Geoff., Hist. Ins., ii, 261 (1762) ; Fourc., E. P., ii, 361, 



nee Fab., Auct. 

 Cimbex, Oliv., Enc. Meth. Ins., iv, 22 (1789). 



Blotch large, wide. Clypeus with a very small emargination ; labium 

 small. Antennae 6-jointed. Posterior coxae widely separated, and with- 

 out teeth ; anterior more oval, closely continuous. 



The antennae are, I consider, six-jointed. The basal 

 two joints are small, the third is nearly as long as the 

 succeeding together, the fourth and fifth subequal. The 

 club is without any trace of segmentation, or there may 

 be one or even two strictures. Whether these actually 

 represent joints I am not at all clear. In one or two 

 specimens I have, the club has every appearance of 

 being comprised of three joints ; but, on the other hand 

 (and I think more often than not), the club is usually 

 quite homogeneous. If the club is to be regarded as 

 comprised of three joints that would make the antennas 

 eight- jointed. 



The lateral sutures on the vertex are broad and 

 deep, and they extend round behind the ocelli, where, 

 however, the suture is not so deep, especially in the 

 middle. A short, broad, longitudinal suture runs from 

 it to the ocellus, which is situated in a deep pit. A 

 suture runs from the lateral ocelli to the antennas. 

 The front is thick and projects considerably from the 



