664 MR. H. F. CUMMINGS ON LICE 



Ibidcecus platale/E Denny. 



A single female among some Colpocephalum material from 

 Ibis molucca Cuv. (/. sh'ictipenn'is) — a straggler, probably, as 

 /. platalem parasitises Platalea leucorodia Linn. The obser- 

 vations which follow were made on specimens kindly lent by 

 Mr. Waterston. 



Male Eejjroductive System. — This closely resembles that of 

 /. Jiavus, sp. n., about to be described. The elongate form 

 of the i^esicula may prove to be a generic character. 



Through lack of material, the male cop ulatory apparatus cannot 

 be satisfactorily described here. 



Mouth-parts. — The modified isopogometric apparatus was de- 

 scribed and figured in 1913 (9, p. 135, text-fig. 27) for this 

 species under the name Docophorus sphenophorus. The mandibles 

 are very interesting on account of their large size, the absence of 

 basal processes in each mandible, and the unusual development 

 of the curious process shaped like a bird's head on the cutting- 

 edge halfway vip between the tip and the base of each mandible 

 (see text-fig. 15). The mandibles of the genus Ibidcecus resemble 



Text-fio-ure 15. 



Ibidcecus platalecB. Mandibles. X 180. 

 L. left. -R. riglit. ». avicularian process. 



closely those of the genus Anatcecios not only in the avicularian 

 process, in the absence of basal process and quadrangular pro- 

 cess, but in the distal extremities consisting each of two apices 

 with one ridged. The species /. platalece is distinguished by 

 the size and prominence of the avicularian process* and in the 

 large size of the ridges, which in side view give the tip of the 

 mandible longitudinally a serrate appearance. When dissected 

 out and placed face downwards on its cutting surface, the 

 mandible is found to be as deep dorso-ventrally as it is long from 

 base to apex. 



* ty. aviculai'ia in tlic Toly^iua. 



