502 On Mammals from Ceard, N.E. Brazil. 



10. Kerodon spixi, Wagl. 



? . 23. Ipu. 



c? . 43 ; ? . 44. S. Paulo, Serra de Ibiapaba. 



11. Thrichomys laurentius, Thos. 



c?. 18, 24 (juv.) ; ? . 22. Ipu, 



This is the most northern locality recorded for the genus, 

 which extends southwards to Paraguay. The typical series 

 of T. laurentius was obtained by M. Robert near Pernainbuco. 



" Native name ' Rabuclo.' Trapped among rocks/' — E. S. 



12. Per amy s domesticus, Wagn. 



<?. 10; ?. 17. Ipu. 



(J. 53, 55, 59; ? . 41, 42, 58, 65. Serra de Ibiapaba. 



A. wide-ranging species, specimens in the British Museum 

 from Paraguay, Matto Grosso, Bahia, Pernambuco, and 

 Ceara being practically identical. 



One of the females is said by Fraulein Snethlage to have 

 had twelve young attached to the mammas. 



" ' Catita.' Lives in or near houses, and one that we 

 caught in our work-room had made a nest of straw and paper 

 under the boards." — E. S. 



13. Marmosa beatrix, sp. n. 



S. 12; $ . 64, 66. Ipu. 



A small species allied to the S. Brazilian M. microtarsus. 



Size about as in M. microtarsus, larger than in pusilla and 

 emilios. Fur soft and fine ; ordinary hairs of back about 

 55 mm. in length, the longer piles about 8 mm. General 

 colour above grevish fawn, very much as in M. marica] sides, 

 and especially sides of neck, more buffy. Under surface 

 cream-colour, fairly sharply defined, the hairs in one speci- 

 men creamy to the base, in two others slaty at base on the 

 belly, creamy throughout on the chest. Orbital rings well 

 defined. Ears greyish. Hands and feet dull whitish. Tail 

 pale grey, the hair of the body scarcely extending on to its 

 base. 



Skull most like that of M. microtarsus, but with a slight 

 tendency to the development of postorbital processes ; the 

 brain-case broader and lower ; bulke smaller. Compared 

 with that of M. marica the whole skull is lighter, the inter- 

 orbital space narrower, and the brain-case flatter. Secator, 

 both above and below, rather shorter than the premolar next 

 in front of it. 



