XXI. CRABRO. 131 
The abdomen black, oblong, curved downward at the apex, 
the first segment narrowing considerably anteriorly ¢. 
The 9 differs only in wanting the yellow colour upon the 
cheeks; and the base of the coxe (their extreme apex is fus- 
cous), the trochanters and femora are black ; it has no yellow on 
the scutellum itself, but only a transverse line behind it, and the 
two or three basal joints of the tarsi are pale ; in all other respects 
it is like the ¢. 
g 9 In my own Cabinet and that 
of the Rev. G. T. Rudd. 
+4+ I captured both sexes at Birchwood this year in the 
beginning of August; the ¢ does not appear to have been 
before known, for that described as such by Van der Linden 
is different. 
Sp. 4. cerratus. N. Sp. 
niger, tibiarum scutello parvo ngro, margine albo ¢. 
length 3£—4 lines. 
Entirely black and shining, sparingly punctured and pubescent: 
the head with an impressed line in front of the anterior stemma 
extending to the sulcation of the face, and another behind it 
proceeding a little beyond the posterior ones; the stemmata 
placed in an equilateral triangle; the clypeus (which is entire) 
and inner orbits of the eyes covered with a silvery pubescence ; 
the first few joints of the flagellum of the antennz ciliated be- 
neath. 
The angles of the prothorax rounded : the metathorax gibbous 
without a distinct enclosure at its base, and having a central 
longitudinal consute incisure, and the lateral lobes irregularly 
slightly obliquely striated; the anterior tibize and first joint of 
the tarsi dilated externally, with a pale margin; the calcaria 
of the posterior legs sometimes fuscous; the wings hyaline, 
iridescent, with the apical half somewhat clouded. 
K 2 
