8 Sir S. S. Saunders' descriptions 



the base of the former, which is frequently deflected at 

 right angles therewith ; the mesothorax and metathorax 

 are gibbous and as wide as the head. The fore wings 

 have the cubital vein projected almost at aright angle on 

 the disc, having a wedge-shaped clava pointing towards 

 the outer margin, the disc being clothed with short 

 recumbent setae, and the margin fimbriated around. 

 The hind wings have the costa and post-costal vein 

 robust at the base and strongly arcuate, with a slight 

 prolongation to a central marginal tubercle bearing two 

 or three booklets, the margin being fimbriated all 

 round. The anterior and posterior legs are shorter than 

 the intermediate pair, which are slender and elongate ; 

 the femora and tibiae of the former are curvate, and 

 those of the latter more robust, all the tarsi being elon- 

 gate. The ovipositor is slender and curvate, slightly 

 exceeding the length of the abdomen. 



The apterous male has a small rotundate fuscous head, 

 contrasting with the thorax, abdomen, and legs, which 

 are fleshy white. It has seven-jointed antennae projecting 

 in front, and turned laterally after the 3rd joint. The 

 basal joint is small and oblong, the 2nd large and sub- 

 ovate, the 3rd as long as the three following, which 

 are small and compact, and the terminal joint is tumid 

 and subglobose. (Plate II., fig. 20). 



The foregoing characters will readily serve to discrimi- 

 nate this new genus and species, for which I propose the 

 name of Pleistodontes imperialis, in allusion to the multi- 

 serrate mandibular appendages of the female. 



Pleistodontes, n. g. 



Mas apterus. Corpus angustum, elongatum, molle. 

 Caput parvum, subsphaericum, antice truncatum. Ocidi 

 parvi, rotundi. Clypeus pone antennas in Ion gum 

 canaliculars, spina intermedia elongata, acuta, basi 

 antice porrecta. (Tab. II., fig. 21). Mandibuke parvae, 

 subfalcatae, apice bidentatae ; processibus duobus brevi- 

 bus, apice transverse dilatatis, conjunctis, inter mandi- 

 bulas porrectis. (Tab. II., fig. 22). Antenna elongatae, 

 glabrae, 7 -articulate ; articulo lmo parvo, oblongo, apice 

 latiore ; 2do magno, basi rotundato, apice truncato, 

 longitudine latitudinem dimidio excedente ; 3tio elon- 

 gato, curvato, tribus sequentibus semel longiore ; his 

 brevibus, transversis, arete conjunctis ; extimo (7mo) 



