new Sjuth- American Rodents. 5i.)j 



forward j)roj('ction af tlio anterior zygoma-root, otherwise not 

 fomi'l ill iEcoinys. 



'I'lie tyj)e specimen has been jrresent^d hy Mr. MeConnell 

 to the Museum with a further consignment of mammals from 

 the River Supinaani, whence tf-ime the collection of which I 

 gave a li.st in a previous nuinbar of the ' Annals.' Several 

 addiMonal s[)ecKs are now inciu'leti, of xvhich Myoprocta 

 ucouchy, Coendou prefiensilis^ Perami/s brcvicaudalus, and 

 Aleles paniscus are particuhudy welome accessions to the 

 Museum collections. 



(Ecomya niteduhts, sp. n. 



A small species allied to CE. rosilla and paricola^ 



Colour above quito of the san?e rich greyish tawny as- in 

 (E. rosilla, the ruin[) similarly more tawny than the fore back. 

 Under surface white, sharply denned laterally, the hairs 

 white to the roots. Kars brown. Hands and fe'jtdull biiffy. 

 Tail uniformly brown above and below. 



Skull as in CE. rosilla^ the tooth-row shorter than in 

 CE. iKiricoht. 



Dimensions of the type (measured in the flesh) : — 



Head and body 118 mm. ; tail 125 ; hind foot 23. 



Skull: greatest length 29 ; basilar length 22-;^; breadth 

 of brain-case 13"3; palatilar length 11*'8; pnlalal foramina 5'2; 

 upper molar series 3'7. 



Uah. Den> rara. Type from the Lower Essequiboj 13 miles 

 from mouth. 



Type. Adult female. B.M. no. 6. 4. 8. 31. Collected 

 29th March, 1906, by S. B. Warren, and presented by 

 Oldtield Thomas. 'i'hree other specimens from the same 

 region presented by F. V. McConnell, Esq. 



This species is quite like the Oiinoco CE. rosilla above, 

 but the under surCcice is without the marked ochraceous wash 

 characteristic of that animal. CE. p(irica/a, which also has 

 a white belly, is duller in tone above, has black ears, and a 

 lunger tooth-row. 



Dasyp)-octa variegata yungarum, subsp. n. 



General colour above more tawny brown than in true 

 variegata, the yellow rings on the hairs replaced by '' tawny" 

 on the back, becoming laterally more " tawny ochraceous." 

 Under surface more yellowish, the whole breadth of the chest 

 and the middle line of belly for a breadth of about an inch 

 brilliant " orange-oehraceous," the hairs greyish at their 



Ann. ct- Mag. N. Hint. Ser. 8. Vol. vi. 31 



