the classification of British Crabronidae. 385 
specimens are freshly caught, or after relaxing in the case 
of old examples. 
In the Thyreopinae the erect hairs * of the antennae of 
the g are in some of the smaller species not conspicuous 
on casual inspection, but they are worthy of attention since 
their arrangement and character show considerable variety 
in different species. Under no circumstances should 
specimens of Crabronidae be gummed on card, most of the 
important characters being hidden or obscured under this 
treatment. 
TABLE OF SUBFAMILIES OR TRIBES. 
1 (2). Antennae of 3 12-jointed, the flagellar joints beneath with 
appressed microscopic hairs or tomentum; both sexes 
with a carina bounding the posterior declivous portion 
of the mesosternum at the sides and with the recurrent 
nervure entering the cubital cell far beyond the middle 
of its lower side, the transverse cubitus longer than the 
distance between its lower extremity and the point of 
reception of the recurrent nervure, sometimes twice as 
long; basal abdominal segment not long and petiolar. 
. Crabroninae. 
2 (1). Antennae of 3 13-jointed; both sexes without a carina and 
at most with a small spinous tubercle in place of the 
carina; recurrent nervure varying in position but usually 
received further from the extremity of the transverse 
ecubitus than the length of the latter, and most often 
much further than this, sometimes near the middle of 
the lower side of the cubital cell. 
3 (6), Basal abdominal segment not long and petiolar with the 
apex swollen. 
4 (5). Mandibles of the 3 always bidentate at apex, of the 2 
(except in Hoplocrabro) with two or more teeth, Antennae 
of 3 with some or many of the flagellar joints with erect 
fine hairs beneath. If the mandibles of the 9 are simple 
(Hoplocrabro) the occipital margin is produced into a 
prominent spine or angle at its extremity beneath the 
Heating ewe Oe a la” tee tat eh SO i iireaninde 
* Tn the single 3 of C. styrius, that I have examined, these hairs 
are not, or hardly, visible under a very strong lens, and even under 
a compound microscope are extremely short and sparse, but they 
are certainly present, 
