512 ON SOME MAMMALS PBOM ECUADOR. [-Apr. 21, 



Genus Ptjdua. 



Size very small. Hair coarse and brittle. Horns simple spikes. 

 Metatarsal and metacarpal joints short. Tail very short or 

 wanting. Ears short and rounded. No turn in the hair of the 

 face. Infranarial portion of the rhinarium deep. Canines absent. 

 Middle pair of incisors not broadly spatulate. Ascending rami of 

 the prenmxilloe may or may not reach the nasals. Lachrymal pit 

 oval and very deep. Auditory bullae not inflated. Ectocuueii'onn 

 and navieular-cuboid bones united. Metatarsal bone not twice 

 and metacarpal bone not Ij the length of the upper molar series. 



2. ICHTHTOMTS SODEHSTEOMI, sp n. (Plate XX.) 



The general colour of the whole of the upper parts dark olive- 

 brown, the main coat of black-brown fur being nari'owly tipped 

 or having a subterminal band of dull yellow; thickly interspersed 

 are longer shining black hairs, these being longest on the hind 

 quarters, where they are broadly tipped with silvery white. On 

 parting the fur the only colour found is soft grey, all the main fur 

 having long fine footstalks, so that the whole coat below the 

 surface, save for the few coarse shining hairs, is of a uniformly 

 fine texture and very dense. Eais same colour as the head. The 

 tail, which is thickly haired, is entirely dark brown or black, the 

 fringe of longer hairs on the lower side being of absolutely the 

 same colour ; the fore feet are covered m ith short black hairs, with 

 a few longer white hairs at the base of the claws ; the hind feet 

 are black above and below, excepting a few grey hairs round the 

 claws and on the inner side of the tarsus the fringe of stiff hairs 

 is white; the whole of the underparts from the chin to the vent 

 are dirty white, the under-fur being grey and the outer silvery 

 white ; the inner sides of the fore and hind limbs are of a more 

 pure while ; the whiskers are black or white according to the 

 positioii in which thoy grow on the face, those placed high up 

 being black, and there are a few particoloured ones in the middle 

 growth. Palate-ridges 3-3. Mammae 6 : one pair on the breast 

 and two pairs on the belly. 



Measurements of type skin( 5 ad. no. 96, i. 28.2,in Brit. Mus.): — 



Head and body 180 mm. Tail 150 mm. Hind foot 31-5 mm. 

 Ear 8'5 mm. Eorearm and hand 81 mm. 



Skull. — Greatest length 31-5 mm.; greatest breadth 16 mm. 

 Nasals — length 12 mm.; breadth 3'9 mm. Intertemporal — 

 breadth 4"9 mm. Interparietal — length 2 mm. ; breadth 3 mm. 

 Basal — length 29 mm. ; basi-facial 18-5 mm. ; basi-cranial 10-5 mm. 

 Palate — length 16 mm.; breadth, outside -^- 6 mm., inside -^3 mm.; 

 diastema 8'5 mm. ; foramina 5'5 mm. Upper molar series — 

 length 4'3 mm. Lower jaw — condyle to incisor tips 20-5 mm. 



Hah. Eio Machangara, Ecuador. " Water Eat. Feb. 1895 " 

 {L.S.). 



The skull is remarkably delicate and fragile for such an old 

 animal (the teeth being much worn), and is smaller and narrower 



