1922] Allen, Congo Sciuridse, Anomaluridse, Idiuridse 49 



Skulls, same specimens: 



Greatest Length Zygomatic Breadth 



cf 53.0 (50.7-54.9) 30.7 (28.9-31.9) 



9 52.5 (51.4-53.6) 30.5 (29.4-31.6) 



Collectors' measurements of 6 adult specimens (4 d\ 2 9 ) from Niapu: 



Total length, 507 (487-524); head and body, 239 (229-247); tail vertebrae 

 268 (255-280); hind foot, 58.3 (53-61); ear, 17.5 (17-18). 



Skull (5 of the same specimens, 4^,1 9): Greatest length, 53.4 (52.4-54.2); 

 zygomatic breadth, 31.0 (29.8-31.6). 



Collectors' measurements of 4 specimens (2 tf, 2 9) from other localities near 

 Niapu (Bosobangi 2, Gamangui 1, Akenge 1) : 



Total length, 493 (452-542); head and body, 237 (225-251); tail vertebras, 265 

 (248-291); hind foot, 54.5 (53-56); ear, 18 (16-19). 



Skull (same specimens): Greatest length, 52.8 (51.9-53.9); zygomatic breadth, 

 30.3 (29.7-31.8). 



The specimens from Niapu and other localities near Niapu agree 

 closely in coloration and other features with the type series from Medje. 

 The large series from Medje is especially interesting from the fact that 

 it contains a large number of young specimens, ranging in age from 

 nurslings to nearly half grown. Of six nurslings (the only teeth pre- 

 sent are the incisors) one was taken April 10, and five August 3, 5, 

 and 24, three of them being from the same litter. Four others are a 

 week or two older (taken September 2, 9, 13, 14) with the first cheek- 

 teeth just breaking through the gums. The coloration of these young 

 specimens differs from that of adults of the same series in no mate- 

 rial respect in either pattern or color. The pelage is, of course, 

 much softer with more underfur, and the ventral surface is more heavily 

 clothed, and hence the color areas are more sharply outlined. The hair of 

 the dorsal surface differs from that of adults in the annulations being 

 apparently narrower, an effect due probably to the shorter pelage. The 

 hairs on the sides of the body are minutely tipped with whitish passing 

 gradually into buffy or pale fulvous toward the midline of the back, as is 

 the case with adults, so that the surface effect is exactly as in the latter. 

 On the ventral surface the color areas are more sharply defined than in 

 adults, owing to the thinner and less complete condition of the coat in the 

 latter. All have the pectoral white patch indicated, and in nearly all 

 it is pure white and forms a conspicuous mark, although varying greatly 

 in size in different individuals. Those in which it is largest have also a 

 small tuft of pure white soft hairs at the axillae, which is obsolete in those 

 that have the pectoral mark only slightly developed. The sides of the 

 nose, chin, and upper throat are dull yellowish brown, becoming paler 

 posteriorly. The inside of the fore and hind limbs is pale yellowish rufous, 



