XXI. CRABRO. 163 
Sp. 23. spinrrectus. N. Sp. 
niger, elongatus, thorace flavo-maculato, metathorace antice 
obliqué striato, peristethio denticulo armato $ 9. 
length 23—3 lines. 
Head black, smooth, and shining, with scattered minute punc- 
tures; the stemmata placed in an equilateral triangle in the 
centre of the vertex, on each side of the posterior ones a per- 
fectly smooth space, and between them a deep longitudinal im- 
pression which extends a short distance beyond, another in front 
of the anterior one extending to the face, which is smooth, 
shining, and canaliculated; the antenne black, with the scape 
yellow at the sides; the inner orbits of the eyes and the clypeus 
(which is slightly carinated in the centre) covered with a dense 
silvery pubescence; the mandibles black, with their apex rufes- 
cent. 
The thorax black, loosely punctrred, and somewhat shining ; 
at the base of the dorsolum two central, parallel, longitudinal im- 
pressions, which extend to the disk, and an obsolete, abbreviated, 
longitudinal carina on each side of them; the metathorax with 
a cruciform incisure, consute, widest at the base of the meta- 
thorax, the transverse one curving upwards and enclosing the 
anterior portion, which is obliquely striated, the strize sometimes 
obsolete; the posterior portion transversely striate, sometimes 
only at its apex, its base having a few punctures; the posterior 
portion of the peristethium having on each side a large acute 
tooth; the collar with an interrupted yellow band or small dot 
on each side; the tegule testaceous; the wings slightly irides- 
cent, a dark cloud beyond their middle, and the nervures piceous ; 
the legs black, with the anterior tibiee, in front, and the inter- 
mediate and posterior ones with a ring at their base, yellow, 
sometimes that of the intermediate wanting, and it also varies in 
having occasionally a yellow spot at the apex of the intermediate 
ones beneath, the tarsi piceous, with their basal joint, or merely 
mM 2 
