386 
Mr. R. C. L. Perkins on 
5 (4). Mandibles of 3 and 9 simple at the apex, not toothed; 
ocelli in a triangle with very wide base; antennae of ¢ 
not fringed with erect hairs beneath on the flagellar 
Joints). os. yas sf) we em oy Tandennag. 
6 (3). Abdomen with ‘Ne Paaal peeene entirely peseiie but 
swollen atthe apex . . . . . . «+ Khopalinae. 
It must be understood that the above table is somewhat 
simpler than would have been the case had I included all 
the many exotic species that I have examined. Thus some 
of the petiolate species of other countries appear to me to 
belong to the Crabroninae and not to the Rhopalinae, and 
have no connection with the latter. 
CRABRONINAE. 
3d. 
1 (2). Superorbital foveae deep and distinct; the front tarsi 
2 (1). 
greatly dilated; head very strongly narrowed behind the 
eyes, so as toform aneck. Thyreus, Lep., 7. clypeatus, Sch. 
Superorbital foveae wanting or represented only by very 
faint impressions or smooth areas near the eye-margins; 
head normal; front tarsi not laminately dilated. 
3 (10). Mandibles without a tooth on the inner (upper) margin 
4 (9), 
10 (3). 
near the middle of its length; antennae with the third 
joint produced beneath near the middle and at the apex, 
the following joints also ‘with projections at the apex 
beneath, .i..u ss - « « Clytochrysus, Mor. 
Ocelli in a nearly saitlaicanl triangle; 3rd antennal tooth 
(or projection beneath) about as long as either of the 
two basal ones. 
}). First tooth with a thin tuft of fine hairs at the apex. 
C. 6-cinctus, H. Schf. (= saundersi, Perk.), 
. First tooth without such hairs. 
. Emargination between the first and second antennal tooth 
very shallow compared with the following. 
C. planifrons, Thoms. 
. These emarginations or arches about equally deep. 
C. cavifrons, Thoms. 
. Ocelli in a more obtuse-angled triangle (but less wide at 
the base than in the following genera), 3rd antennal tooth 
much shorter than the first two and of minute size. 
C. chrysostomus, Lep. 
Mandibles with a tooth on the inner margin towards the 
middle; antennae with the third joint simple. 
