188 CRABRONID&. 
from the anterior stemma to the face behind; between the pos- 
terior stemmata it is slightly elevated, in the centre of which 
there is a minute longitudinal impression, proceeding to near 
the occiput, the face canaliculated, smooth and shining ; the an- 
tennz black, the scape yellow, with a black stain above, and 
the pedicel yellow beneath, and slightly produced on the ex- 
terior; the first, second, third, and fourth joints of the clavolet 
produced beneath at the apex, and much curved, or rather 
emarginate, the teeth beneath of the first and second the most 
obtuse, its first joint shorter than its second, which is also 
slightly produced at its base above, the fourth joint very slightly 
shorter than the third, and its tooth the most acute of all; the 
whole clavolet fuscous beneath, and the apical joints also above, 
with the extreme one quite black ; the interior of the orbit of 
the eyes, the cheeks, and the whole clypeus, covered with a 
dense silvery down, the latter carinated in its centre, produced 
in front into an obtuse tooth, and the sides sinuate; the man- 
dibles black, their apex piceous. 
The thorax black, pubescent; the dorsolum with a central 
longitudinal carina, and, as well as the scutellum, longitudinally 
striate ; the metathorax with a central incisure, the margins of 
which are ridged, which ridges, about the middle, curve round 
on each side, each inclosing a lobe ; at the base of the meta- 
thorax, the inner space of which is slightly rugose, the incisure 
dilates, where the ridges turn off, into a deep fossulet, continu- 
ing to the apex, the sides of which, forming the posterior por- 
tion of the metathorax, are very coarsely transversely striate; the 
peristethium has at its apex, on each side, a transverse carina ; 
the collar with sometimes a transverse yellow interrupted band ; 
the tegulze testaceous, the wings coloured, darker towards their 
edges; the nervures piceous. The anterior femora ferruginous 
above and in front, black behind, yellow beneath, and, still deeper 
below, a black stripe; their tibize yellow above and in front ; 
towards the apex, in front, ferruginous, and black behind; 
the intermediate femora black, with a ferruginous streak above ; 
