J64 ON RHYNCHOCYON AND PETRODROMUS. [Jan. 4, 



tained by Dr. Kirk about 100 miles inland, on the Rovuma river. 

 It is fully adult, sex unknown. A second example, sent by Dr. 

 Kirk in 1868, has been made into a skeleton ; it is somewhat older 

 than the other, but shows the same proportion of the length of the 

 tail to that of the body. The skulls are of nearly the same size as 

 that of R. cirnei figured by Peters. 



3. Rhynchocyon chrysopygus, sp. n. (Plate XIV.) 



The upperside of the head is grizzled grey and brownish red ; back 

 and sides of a uniform deep rich chestnut-brown, with six more or 

 less indistinct short black stripes in the middle of the back ; they 

 are very indistinct in the young. Sacral region golden yellow, pass- 

 ing into chestnut-red on the thighs. Lower parts chestnut-red, 

 less bright in the young than in the adult. Tail blackish, the ter- 

 minal two fifths white, the extremity being black again. 



Spec. A., acl B., ad. (J., juv. 



Length to the root of the tail . 285 mm. 270 mm. 255 mm. 

 Length of the tail 230 „ 225 „ 200 „ 



Of this species we possess three skins, sent by Dr. Kirk ; they 

 were obtained on the river Mombaca. Two of the specimens are 

 fully adult ; the third has still two-notched incisors, which seems to 

 be a peculiarity of the young of this geuus. The incisors of the 

 adult show a single notch. The skull is very similar to that of the 

 two preceding species, but has a conspicuously longer facial portion. 



4. Rhynchocyon petersi. 



Rhynchocyon 2ietersi, Bocage, Joru. Sc. Lisb. 1880, p. 159. 



Cheeks, ears, neck, fore part of the back, fore limbs, and a part 

 of the sides intensely ferruginous red ; the remainder of the back 

 and sides, the upper part of the base of the tail, and the outer side 

 of the limbs deep black. Lower parts pale reddish. Head grizzled 

 grey and brown. Tail ferruginous red above, white at its extremity. 



An immature specimen, sent from Zanzibar, and now in the 

 Lisbon Museum, is 260 mill, long to the root of the tail, the tail 

 measuring 185 mill. 



Petrodromus tetradactylus (Ptrs.). 



This species extends northwards to the river Mombaca. A fine 

 odult specimen, probably a male, shows a very extraordinary de- 

 velopment of the hairs of the lower part of the tail. These hairs 

 are stiff, elastic bristles, 5 mill, long, with a swelling at the tip. It 

 is difficult to guess with any probability what may be the function 

 of this tail-brush. 



