82 SPHECIDA. 
clypeus, which has the form of a truncated triangle, the apex 
extending high in the face, the anterior margin rounded ; 
labrum concealed when the mandibles are closed, but some- 
what turbinate, and having a central longitudinal carina; the 
mandibles large, arcuate and bidentate, each tooth having at 
its base, within, a small process, the apical tooth acuminate, 
and the inner one triangular, sometimes obtuse at its ex- 
tremity. THorax ovate; the collar transverse, attenuated 
and depressed, and constricted in front into a sort of neck ; 
the dorsolum having an epaulet, generally pubescent, passing 
over the tegule; the scutellum transverse; the metathorax 
slightly inclined, truncate posteriorly ; the superior mings mith 
one marginal cell long and narrow, rounded at its apex, and 
three submarginal cells—the first as long as the two following 
—the second quadrate, receiving the first recurrent nervure 
towards its end—the third forming a truncated triangle, nith its 
posterior margin slightly rounded, and recewing the second re- 
current nervure m its middle—a fourth cell sometimes com- 
menced ; the legs moderately long and stout, and generally 
having the anterior tarsi ciliated, and the intermediate and 
posterior tzbze with a double row of spines. The aspomEen 
ovato-conical, distinctly and abruptly petiolated, the petiole 
formed of the anterior half of the first segment; the hypo- 
pygium flattened at its extremity, and obtuse, and produced 
beyond the podex. . 
Type, S. flavipennis. 
t4+ The name is derived from o¢yé, a wasp; it is very 
old, and long remained a grand heterogeneous repository, 
until by degrees several genera were separated from it; but 
it now comprises, thanks to Jurine, only such as possess the 
above characters, which form those of his second family of 
the genus Sphez. 
