ON NEW AND LITTLE-KNOWN HYMENOPTERA, 365 
6TH GROUP. 
The transverse medial nervure of the front wing interstitial. The 
cubital nervure of the hind wing arising after the apex of the anal 
cell. Claws toothed and possessing a claw-brush. The tarsal-brush (in 
the female) developed. Also the labrum (in the female) of many of the 
species is exerseted. 
(tH GROUP. 
The transverse medial nervure of the front wing interstitial, The 
cubital nervure of the hind wing arising after the apex of the anal cell. 
Claws toothed and possessing a claw-brush. Tarsal-brush (in the 
female) wanting. The labrum (in the female) never much exerseted. 
8TH GRouP (Aporus, pt.) 
By the loss of the 2nd transverse cubital nervure diverging from 
the forms of the 7th group. In other respects resembling them. 
9TH GROUP. 
The transverse medial nervure of the front wing and the cubital 
nervure of the hind wing are interstitial. Claws furnished with a 
curved obtuse appendix on their inferior edges, bifid. Claw-brush 
present or wanting. Tarsal-brush (in the female) well developed. 
10TH Group (Aporus, pt., Tab. II, Fig. 8.) 
Fore wing with only two cubital cells. The transverse medial nervure 
of the front wing interstitial, Cubital nervure of the hind wing 
arising after the apex of the anal cell. Claws bifid. Claw-brush 
wanting. Tarsal-brush developed. Antennz often incrassate. Posterior 
margin of the pronotum angular. (This group, from the position of 
the recurrent nervures and from the closing inwards of the 2nd 
recurrent nervure, approaches the forms of Pompilus in which the 2nd 
and 3rd transverse cubital nervures have by degrees become united to 
form one single nervure. The facts can, I think, be accounted for as 
follows. The cubital nervures originally began to come in contact on 
approaching the radial cell, as, for example, in the individuals of 
P. nigerrimus, and later little by little they anastomozed against the 
cubital nervure in the direction of the radial nervure, until the enclosed 
triangular 3rd cubital cell disappeared completely.) The pedigree of 
this and of the following group may possibly he contained in the 12th 
group. 
