SO'J, PTKEOPFS COGNATFS. 



aspect of back and rump Prout's brown ; individual hairs seal-brown 

 at base, with short paler brownish or bufly brownish tips, in- 

 completely concealing the darker base of the fur. Rump not 

 differing in colour from back. — Entire underside approximately 

 Prout's brown, of a rather paler tinge than back, palest (indistinctly 

 washed with huffy russet) on foreneck, and darkening almost to 

 seal-brown along centre of breast and belly. — Mantle and sides of 

 neck cinnamon, slightly tinged with russet, becoming paler 

 posteriorly at shoulders ; concealed base of hairs seal- brown. A 

 tuft of buff-yellow glandular hairs on each side of neck, nearly 

 concealed by surrounding darker fur (probably sexual character). — 

 Crown and sides of head similar to back. 



A second specimen (male, a little younger than the above ; 

 December ; skin) is slightly paler in colour, owing to the pale- 

 coloured tips of the hairs being rather longer and more approaching 

 huffy cinnamon. 



Measurements. On p. 2-57. 



Specimens ea-amined. The British Museum material. 



Mange. San Christoval, E. Solomon Islands. 



Ttipe in collection. 



History in literature. — Gray's Pt. rayneri (1870, I. s. c.) is a 

 mixture of two species, the one from Guadalcanar (his " male " and 

 " female "), the other from San Christoval (his " young ''). Since 

 Pt. rayneri was based by Gray primarily on the adult " male " and 

 "female" (which in fact are two adult females), both of which are 

 from Guadalcanar, the name Pt. rayneri must be restricted to the 

 Guadalcanar species. The characters of the San Christoval species 

 were pointed out by me, and the species named Pt. cognatus, in 

 1908 (L. s. c). The British Museum specimens of Pt. cognatus are 

 the only ones on record (February, 1909). 



Pemarlcs. — Prom Pt. rayneri, with which this species accords in 

 the characters of the skull and teeth (except perhaps in a still more 

 conspicuous shortening of the rostrum), it is readily distinguished 

 by having the rump similar in colour to the back, whereas in 

 Pt. rayneri the rump is much brighter than and contrasting with the 

 back. It is probably smaller than Pt. rayneri. Externally (dis- 

 tribution of fur, colour, size) it bears much resemblance to the 

 Australian species of the Pt. hypomelanus group, Pt. brunneits, 

 which however is typical hypomelanine in skull and dentition. 



a. (S ad. skull. SanChristoval, Solomon Museum of Economic 55.11.7.5. 



Is. ; Dec. 18.54 (J. Geology [P.]. 

 MacGilliwcri/). 



b J' imm. sk. ; San Oliristoval ; Dec. Museum of Economic 55.11.7.9. 



skull. 1845 {J. MacGilli- Geology [P.]. 

 vray). 



(Tyipe of species.) 



c. cJ juv. sk. ; San ChristOTal ; Dec. Lords of the Admiralty 56.7.7.1. 



skull. 1854 {Br. F. M. [P.]. 

 Baynei-). 



