the classification of British Crabronidae. 391 
30 (31). Anterior area of propodeum on each side of the median 
channel rugose or striate . . . . C. varius, Lep. 
31 (30). Anterior area with a smooth polished space on each side 
ofthe channel . .  . C. ovalis, Lep. (anxius, Wesm.). 
32 (25). Mesopectus without a spine or tubercle on each side. 
33 (34). Anterior area of propodeum with a smooth space on either 
side of the median channel, this space being at the most 
very faintly rugulose even under a very strong lens. 
C’. (2?) wesmaeli, V. d. Lind. 
34 (33). Anterior area closely rugose or striate. 
C. (2) elongatulus, V.d. Lind. 
35 (16). Large species with yellow-marked abdomen; either the 
front tibiae are angulately dilated (but not laminate) or 
the front femora havé a spine beneath. Recurrent 
nervure always received far beyond the middle of the 
lower side of the cubital cell. 
36 (37). Superorbital impressions, deepish, large and very distinct, 
not situated in wide lateral depressions of the head; front 
femora with an angular spine beneath before the middle ; 
basal abdominal segment ordinary not lengthened, the 
spiracles not further apart than the distance from them 
to the base of the abdomen; 7th ventral segment without 
erect spines, but with a basal elevation (mandibles with 
a well-developed tooth near the middle of their inner 
margin; clypeus with a distinct median truncate or 
slightly emarginate production of its apical margin and 
with a well-marked angle on each side exteriorly to this. 
Acanthocrabro gen. noy., A. vagabundus, Pz. 
37 (36). Head widely depressed on each side to the ocellar region, 
the superorbital foveae sometimes ill defined, sometimes 
with the inner margin raised so as to form a longitudinal 
division of the large lateral depressions of the head; 
basal abdominal segment elongated, the spiracles not so 
far apart as the distance from them to the base of the 
segment; 7th ventral segment with two erect spines. 
Cuphopterus, Mor. 
38 (39). Hind tibiae spinous above, the hind femora unarmed, the 
hind coxae with a spine or angular projection beneath 
(mandibles on their flat surface impressed between the 
longitudinal carinae) . . . «. C. dimidiatus, Fab. 
39 (38). Hind tibiae unarmed, the hind femora with a spine or 
tooth beneath towards the base inwardly. 
C’. signatus, Panz. 
40 (15). Occipital margin of the head produced into a prominent 
