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MR. B. F. CT'MMTXGS OX LICE 



chsetotaxy. Fahrenholz omits all reference to the larval clifeto- 

 taxjr of the head and thorax, and it is therefore worthy of 

 remark that, while the head and thoracic chfetotaxy (dorsal 

 snrface)of larvte and adults are almost identical, the arrangement 

 of the hairs on the ventiul surface of these parts in the larvfe of 

 P. affinis differs considerably, especially that of Stage I., from 

 that of the adult in the same regions. On the dorsal surface the 

 differences are negligible. But on the ventral surface of the bead 

 in Stage I. there are but two hairs (or bristles) ; in Stage II. 

 there are four (two in front and two behind), and two minute 

 hairs on each side in the preantennal area. The lower surface 

 of the head of Stage III., as regards chsetotaxy, closely resembles 

 the adult, except that the small group of hairs behind each 

 antenna contains fewer hairs than in the group of the adult. 

 On the ventral surface of the thorax there are fewer of the 

 minute scattered hairs. 



These facts are of some interest, being contrary to Avhat has 

 been found to obtain in the larvje of three species of Polyplax 

 (6, p. 271), where the chtetotaxy of the head and thorax is fully 

 adult in Stage I., while that of the abdomen in the same stage 

 agrees with Pedicidus in presenting great differences. 



Genus Pedicixqs Gervais. 



Several species of Pedicinina?, including one undoubtedly new 

 form from Colobus caudatus Thos. (Family Cercopithecidae). are 

 contained in the collection. But this group is difficult and inf 

 some confusion, and the Society's material is insufficient to 

 justify any attempt to straighten things out. Fahrenholz's 

 paper (5, p. 12) clears the way for a revision, which can best 

 be effected by a study of the male copulatory apparatus. 



Only the two following species have been definitely named : — 



Pedicixus rhesi Fahrenholz (5, p. 16). 



A few specimens from Macacus imius (now known as Piihecvs 

 inuus Linn.). Fahrenholz's specimens were obtained upon a 

 " Macacus rhesus." Both hosts belong to the Cercopithecida^. 



Genus Phthirpedicixus Falirenholz (5, p. 22). 

 Phthirpedicixus MiCROPS (Nitzsch) * (5. p. 25). 

 A single female from an unrecorded host. 



Genus PoLYPLAx Enderlein. 



PoLYPLAX SPixuLOSA (Burni.) (7). 



Numbers of specimens of this cosmopolitan species caueht on 

 the cosmopolitan rat [Epimys norregicus Erxl.). The larvae and 



* [The parentheses avound tlie names of r.iitliors plsscfd after scientific names in 

 this paper are used in accordance with Article 23 of tlie International Rules of 

 Nomenclature (Proc. 7th Int. Cong. Boston, 1907, p. 44 (1912j). — EiuioE."; 



