Neiv Genera of British Mymaridac. 453 



the joints in the antennae of the female, as well as the 

 decided form of the wings.* 



Cleruchus, n. gen. 



Tarsi 4-jointed. The abdomen sub-sessile. The antennae of the 

 male 1.3 joints ; of the female 9 joints. The scape is very long. 

 The apical joint forming an elongated elliptical club. 



The scape springing fi'om a very decided ridge, projecting from 

 between the eyes ; giving the head a somewhat flattened appearance. 



The vyings are almost destitute of surface hair, with the exception 

 of a central row running from the base to the tip. The cilia are 

 very long and slender. The anterior wings are narrow, parallel from 

 near the base to just before the apex, where they gently curve down. 

 The posterior wings a very little shorter than the anterior, and about 

 half the width and parallel. 



The ovipositor projecting beyond, and the tip rising above the 

 abdomen. 



Chruchv.s pluteus, n, sp. (PI. XII, figs. 6-10.) 



General colour, smoky brown ; the head and front part of the 

 thorax darker. 



The antennae of the male, 13-jointed, are dark brown, the joints 

 slightly increasing in length to the apex : those of the female, nine 

 in number, are brown, paler at the base. The scape very long and 

 compressed, curved and tapering to the base, which springs from a 

 projecting ridge between the eyes. The pedicel is short and broad, 

 the 3rd joint very short, the 4th almost twice as long as the 3rd, 

 the 4th, 5th and 6th equal in length, the 7th and 8th a triHe shorter 

 and broader. 



The club the same length as the scape. 



The loings smoky brown, 0-6 mm. in length by 0*075 mm. in 



* Mr. Waterhouse has furnished me with the following note on 

 the colour of a fresh male specimen of this genus, apparently 

 referable to the same species, taken by him in Richmond Park on 

 Oct. 23rd on Juncus glaucus — 



" Head pale dirty yellow, the ridge between the eyes nearly black ; 

 the three large ocelli are also nearly black. Thorax light smoky 

 brown, with a pale dirty yellow dorsal line. The metanotum has 

 the appearance of being slightly excavated, with a pale yellow 

 membrane across it. Abdornen rather darker brown than the 

 thorax. Legs pale yellow, the apical joint of the tarsi pale fuscous. 

 Antennae pale dirty vellow, the basal joint clear yellow. 



" Length 075 mm." 



