150 CRABRONIDE, 
incisure crossed near its middle by a transverse one, which 
curves upwards on each side, and encloses a semicircular space, 
quite smooth and shining, and joining that which separates the 
metathorax from the postdorsolum, the whole incisure consute ; 
the posterior portion of the metathorax smooth and shining in 
front, and slightly transversely striate laterally and behind ; 
the peristethium having on each side behind a minute tooth ; 
the collar with an interrupted yellow band, and the scutellum 
slightly yellow in front; the tegule piceous ; the wings slightly 
coloured, and nervures piceous; the legs with the femora black; 
the tibize yellow, with a black litura beneath the anterior and 
intermediate pairs, the posterior pair with a piceous spot at 
their apex within ; all the tarsi fuscous, paler at their base, the 
anterior pair very slightly ciliated on the exterior, and the 
intermediate and posterior tibie slightly spinose. 
The abdomen black, with five yellow bands variously inter- 
rupted, sometimes all merely subinterrupted; the anal segment 
yellow at its base on each side; the intermediate space between 
the anal carine punctured and black, its extreme tip ferru- 
ginous 9. 
The ¢ has the antenne simple, and differs in having their 
clavolet fimbriated beneath; the yellow of the collar and scu- 
tellum generally wanting; the wings with a dark spot within 
their marginal cell; the anterior trochanters yellow, their fe- 
mora testaceous beneath and in front, and having a small pro- 
duced tooth on their exterior towards the base; the intermediate 
femora testaceous behind and in front; in all else the legs re- 
semble the 9 ; the abdomen is oblong, with seldom more than 
a minute spot on each side of the first segment, a band, more 
or less interrupted, at the base of the second and third, a trans- 
verse line on each side of the fourth, a central ovate spot on the 
fifth, and a central transverse line on the sixth, but the markings 
of the first, fourth, and fifth segments are sometimes wanting. 
$ @ in my own Collection. 
{4} This species is not uncommon near London. 
