64 POMPILID®. 
+4+ This species approaches very closely to the preced- 
ing, but I consider it sufficiently distinguished from it in 
the thickness of the antennz; it has also more of the 
whitish down upon its body. I at first thought it what 
Vander Linden calls the P. pectinipes of Linné, but the cilia- 
tion of the anterior tarsi cannot certainly be called ‘‘ forte- 
ment pectinés,” as they are scarcely more so than in the pre- 
ceding species, and to which it is decidedly more closely 
allied than to the P. viaticus, with which he compares his 
P. pectinipes ; besides which it is very different from the 
specimens in the Linnean Cabinet; but the thickness of 
the antenne furnish so remarkable a character that it could 
not possibly have been overlooked. I took five specimens 
in 1832, at Hampstead, since when I have not captured it; 
but the Rev. F. W. Hope has taken it this year, at South- 
end, in Essex: and the Rev. C. Bird showed me a remark- 
able variety of it, captured at Burghfield, by S. W. Hasle- 
burst, Esq. of Trinity College, Cambridge, which has upon 
the left side the nervures of Aporus; but I have already 
shown above, under P. niger and viaticus, that this is not 
an unusual divarication in this genus. 
Sp. 15. ruscus. Lin. 
mger, glaber, abdomine basi ferrugineo, alis fuscis g 9. 
length 33—7 lines. 
Fab. E. S. Supp. 246.3; Piez. 189.11; Panz. 65. 15; Ency. Méth. 
10. 182. 16; V.d. Lind. pt. 1. 66. 33. 
Sphex fusca. Lin. F. S$. 1652; S. N. 944. 16; Fab. S. E. 349. 19; 
E, S. 2. 210. 46; Rossi, 2. 95. 813. 
Black: the head punctured, pubescent; the mandibles rufes- 
cent in the middle; labrum slightly exposed, subemarginate. 
Thorax delicately punctured, pubescent; metathorax some- 
what obtuse, with a deep impression at the centre of its base, 
