Afammals from Juju}/. 191 



Size rather less than in true muscuUnus of Maimara, feet 

 and tail aver;i(;iiig shorter. Colour above slightly duller, 

 browner, and less clear, and below, where the difference is 

 nioio noticeable, the tone is a dull pale drabby, approaching 

 (though much less than) that found in Mus inusculus, while 

 in true }nuscuUnus the colour is a clear greyish white, with 

 scarcely any sflspicion of drabbiness. 



Dimensions of the type: — 



Head and body 94 mm. ; tail 83; hind foot 19; 

 ear 15. 



Skull: greatest length 24*5; condylo-incisive length 22'3 ; 

 zygomatic breadth 13*4 ; nasals 9 ; interorbital breadth 3"8 ; 

 palatilar length 10 ; palatal foramina b6 ; dental length 11; 

 upper molar series 35. 



Ilcib. as above. 



Tt/pe. Adult male. B.M. no. 20. 1. 7. 46. Original 

 nuniber 577. Collected 29th April, 1919. 



This laucha is no doubt very closely allied to the true 

 viusculiiius* of Maimara, with which it shares the number of 

 fourteen mammae ; but on comparison of fifteen specimens 

 with six of 7mcsculinics it proves to have so uniformly drabbier 

 an under surface, while both feet and tail average shorter, 

 that I have thought it worthy of having a distinctive name. 



A single old male skull — one of those overgrown examples 

 which often render distinction by size so difficult — measures 

 no less than 26 mm. in greatest length ; but this is obviously 

 abnormal, the type being of about the usual adult size. 



9. Oryzomys &T^.jjlavescena group. 



^ c? . 613, 614, 655, 663, 080 ; ? . 624, G3G, 639, 640, 648. 

 Villa Carolina. 500 m. 



10. Graomya hcktooodi, Thos. 



(? . 625, 631, 668, 681, 685, 694, 697 ; ? . 616, 617, 6i4, 

 672, 673, 689. Villa Carolina. 500 m. 



" Trapped among fallen trees." " Lives in hollow tree- 

 ivnukH."—E. IJ. 



These specimens again show that the presence or absence 

 of slate-grey at the bases of the belly-hairs is in this group 

 a character of no im|jortance, all conditions occurring in the 

 series. 



None of these examples have feet (piite as long as in the 



* Ulif/modnutia lauchu musculiiut, Thos. Aun. & yia^^. Nat. Hist. (S) 

 xi. p. liiQ (^ItiKJ). 



