XXI, CRABRO. 15s 
minute spot on each side of the fourth, a spot or two in the 
centre of the sixth, yellow ; and the anus flavo-ferruginous. 
$ ¢ in my own and other Cabinets. 
+4+ This species is not common. It has been found in 
the Isle of Wight by F. Walker, Esq., at Ripley in Surrey 
by Mr. Stephens, in Lancashire by Mr. Davis, and it has 
occurred in Kent; but I have never found it in the im- 
mediate vicinity of London. 
Sp. 15. Levucostoma. Lin. 
niger, antennarum scapo tantim a latere flavo signato, meta- 
thorace levi. 
length 4—5 lines. 
Fab. Sys. Ent. 376.13 ; Spec. 1.472. 17; Mant. 1.297. 27; Ent. Syst. 
2. 301.27; Oliv. Ency. Méth. 6. 518. 35; V.d. Lind. pt. 2. 61.24. 
Sphex leucostoma, Lin. F. 8. 1663; Syst. Nat. 1. 946. 36; Villers, 3. 
237. 43. 
Pemphredon leucostoma. Fab. Piez. 314. 1. 
Crossocerus leucostomu. St. Farg. 3. 777. 13. 
Crabro bidens. Ualiday, Ent. Mag. 1. 516. ¢. 
Head black, shining, subpubescent; the vertex with several 
irregular depressions, and a few scattered minute punctures ; 
the stemmata placed in a triangle in its centre, in front of the 
anterior one a deep longitudinal impression extending to the 
face, which is canaliculated, smooth, and shining ; the antenne 
black, the side of the scape with a yellow streak; the inner 
orbits of the eyes and clypeus densely covered with a silvery 
pubescence ; the mandibles black, their apex piceous. 
The thorax black, subpubescent, smooth, and shining; the 
dorsolum and scutellum with a very few minute scattered punc- 
tures, the former with two central parallel impressed lines running 
to the disk ; the metathorax with a central deep longitudinal 
incisure, a subcordiform, smooth, and shining space at its base, 
not always distinctly enclosed, beyond which it is minutely 
