Malacoderm Genera Prionoceius and IJgia. 329 



2. Prionocerus bicolor. 



IVionocerus biculor, Redt. Ileise diT Novara, ii. p. 109, t. 4. fig. 3 

 (1M«)8); (lorb. Ami. .S»c. Knt. Jlel^'. .xxxix. p. 3lH (189')). 



Idyia (Prionucerus) bicolor, var. notaticoUvi, Pic, L'Echaog'e, xxvi. 

 p. 53(1910). 



cJ . Anterior tarsi and genital armature (PI. XI. fig. 2) as iu 

 P. cceruleipennis, Pcrty, except that tlie median lolje is less 

 sinuate at the tip. 



Hub. I.NDiA, Sikkiui, Allahabad ; Burma ; Siam ; Mala- 

 yan Kechon generally. 



This insect is cxtreinely closely related to P.caruleipeiuiis, 

 and occurs with it in some of the Malayan localities, 

 dirtering from that species iu having the anteunjo a little 

 less dilated in the two sexes, and the elytra wholly fulvous. 

 The type was from Java. P. bicolor has been found in 

 numbers by Mr. H. Stevens at Gopaldhara, in the lliing- 

 i)()ng Valley, Sikkim, unucconipanicd by its near ally. 

 Females preponderate in the series before me. A variety 

 from Tharrawaddy, Burma, with the scutellum yellow has 

 been recorded by Gorham (/. c), and another, from Sumatra, 

 with a dark median patch on the prothorax, by Pic. 



Idgia. 



Idffia, Castelnau, in Silberni. Rev. Ent. iv. p. 27 (1836); Hist. Xat. 



ins. Coleopt. i. p. 27.5 (1840). 

 iJfrumma, KoUar and iicdtenbacher, in Ilugel's Kascbmir, iv. 2, 



p. 512(1.^44). 

 Diprosopus, Mulsant, Mem. Acad. Lyon, i. p. 209 (18ol), 

 Thacoma, Widker, Ann. A: .Mag. Nat. Hi.''t. (3) iii. p. 200 (1850); 



GemminpT and Harold, Cat. Coleopt. vii. p. 2179 (1870) [sub 



CEdeiuendse]. 



Tlie generic name Idffia, type /. terminata, Cast., from 

 Senegal, is here used for all the Prionoeerids with the 

 antennic filiform or moderately serrate, at least in ? . The 

 structure of the anterior tarsi is precisely similar to that of 

 I'rioJiocerus, and the form of the genital armature of the 

 males also shows their close relationship. The superficial 

 ifsemblance of many of the species to the (Edemeriil 

 Aacerdes melaiiura, L., and the Telephorid Rhnyomjcha fulva, 

 Scop. ( = 7nelaiiura, Oliv.), is very striking, one, indeed, 

 having been described as belonging to the first-named group. 

 Tlie Museum material includes, in addition to species here 

 enumerated, a very elongate, large, subopr.quc, blue form, 



