the Lower Amazons. 277 



41. (Ecomys tapajinus, Thos. 



J. S. 22, 23. Island of Marajo. 



S . S. 138. Villa Braga, R. Tapajoz. 



^ . S. 87. Manacapuru, R. Solimoes. 



? . ]\[. 20. Monte Alegre, near Santarem {0. Martins). 



42. Proechimys goeldii^ Thos. 



(? . S. 92 ; ? . 90, 91. Acajutuba, Rio Negro. 

 $ . 94, 95 ; ? . 93. Manacapuru, K. Solimoes. 

 Five molar laminss are frequently, it not invariably, present 

 among- these specimens. 



43. Cercomys laurentins, Thos. 

 (S . L. 42. Serra do Castello, Ceara (F. Lima). 



44. Echimys armatus, Geoff. 

 S . 144, 145. Villa Braga, R. Tapajoz. 



45. Lonchothrix emilm, Thos. 

 Suprd, p, 114. 



cT. 142. Villa Braga, R. Tapajoz. Type. (B.M. 

 no. 20. 6. 4. 1.) 



This remarkable animal, the prize of the collection, has 

 already been described, but I include it here to make the list 

 complete. 



46. Isothrix hisiriata negrensis, subsp. n. 



? . 89. Acajutuba, Lower Rio Negro, near its mouth. 



Nearly allied to /. h. orinoci, and agreeing with it, as con- 

 trasted with true bistriata, in the presence ot marked light 

 postauricular patches and the shortening of the median light 

 crown-patch, which ends opposite the middle of the ears 

 instead of being continued down the nape ; the nape is there- 

 foie blackish all across instead of being divided in the centre. 

 DiH'ering from orinoci by the general colour being strongly 

 sutiused with ochraceous, the rump much more ochraceous 

 than the body, the ear-patches bufty instead of whitish, the 

 median crown-patch distinct and bufly instead of being 

 whitish and only vaguely indicated, and by the under surface 

 being strong ochraceous buti'y throughout. Tail with the 

 basal two-fil'ihs dull ochraceous instead of a quarter or less. 



JSkull quite as in bistriala and orinoci. 



