330 Mr. G. C. Champion on the 



coloured like tlie Chinese /. hugeli, Redt., represented by a 

 single damaged example, uhicli must be left unnamed for 

 the present, no locality-label being attached to it. 



African Species. 



Prothorax (except in I. dimuUata, Tar. trijmrtita, Pic) and 

 elytra testaceous, the apical portion of the latter to a 

 greater or less extent black. 



Tibial spurs long No. 1. 



Tibial spurs short Nos. 2-6. 



Prothorax and elytra nigro-cyaneous No. 7. 



Prothorax fulvous, the elytra black or nigro-cyaneous .... No. 8. 



1. Idgia plectrophora, sp. u. 



Extremely like 1. (Prionocerus) dimidiata, Gerst., and 

 similarly coloured, and only separable therefrom by its 

 structural characters: tibial spurs long, including the one 

 on the antei'ior pair, in both sexes, strongly developed in ($ ; 

 anterior tarsal joints 1 and 2 elongated, 1 slightly curved, 

 smooth and almost glabrous at the base, and produced into 

 a dentiform lobe at the inner apical angle, 4 small, narrow_, 

 the comb on 1-3 extending along the greater part of their 

 length ; joint 1 of intermediate and posterior tarsi com- 

 pressed, slightly curved, and smoother at the base. 

 Genital armature (PI. XI. fig. 8) : lateral lobes long, broad, 

 rounded at tip ; median lobe narrow, drawn out into a 

 long, slender, downwardly-curved point. 



Length (excl. head) 9-13, breadth 3^-4^ mm. (c? ? .) 



Hab. E. Africa, Tabora (ex coll. Fry : type, (J ), Salt Lake 

 — Wawamba {Scott Eliot), East shore of Victoria Nyanza 

 near Karungu, Lusinga IsL, Kisuniu (Port Florence), Upper 

 Kuja valley, S. Kavirondo" (<S. A. Neave), S. Masai Reserve 

 {T. J. Anderso7i), Mogorr River [A. 0. Luckman) ; Uganda, 

 W. and S.E. Ankole (4400-5000 ft.), and S. of Lake George 

 (-S. A. Neave), Maramu and Kamwezi (C. H. Marshall). 



The series examined includes upwards of 250 examples, 

 showing but little variation, the black apical patch rarely 

 reaching forward to the middle of the elytra, the prothorax 

 constantly fulvous, the armature of the tibiae and tarsi 

 perfectly constant, the females separable from the same sex 

 of /. dimidiata by the longer tibial spurs. The genital 

 armature of several males has been examined. 



