veio Hesperomys and Gale^ from Bolivia. 623 



Mr. Brido-es at Santa Criiz some seventy-five years ago, and 

 a few odd specimens collected by Herr Steiubach, almost no 

 collections liave been made in this area, so that all those 

 sent by the Marquis de Wavrin are very acceptable, and the 

 occurrence of these two new ones was quite to be expected. 



Hesperomys mur. 'cuius, sp. n. 



A comparatively large dark species, rather like Mas 

 inusculus. 



Greneral size about as in //. musculnins. General colour 

 dark mouse-grey, the tips of the hairs inconspicuously buffy. 

 Under surface soiled greyish, the hairs slaty at base and 

 washed teiininall7 with dull whitish, far less white than in 

 other species. Proectote of ears blackish, with butfy edges, 

 metentote buffy brown ; no white ear-patch. Hands and 

 feet grey. Tail about as long a-i the body without the head, 

 dark grey above, rather lighter below. Number of mammas 

 not known. 



Skull of the usual shape, the adult with very well-deve- 

 loped sui)raorbital ledges. 



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



Head and body 89 mm.; tail 69 ; hind foot 20 ; ear 16. 



Skull: greatest length 25*3; condyl j-incisive length 24; 

 zygomatic breadth 13"2 ; nasals 10 , interoibital breadth 4-2 ; 

 breadth of brain-case on ridges 10 ; palatilar length 10'3 ; 

 palatal foramina 6 ; upper molar series 4'1. 



Hah. S.E. Bolivian lowlands. Type from San Antonio, 

 Parapiti, on 20° S., about 250 km. south of Santa Cruz de la 

 Sierra. Alt. 600 m. 



7i/pe. Adult male. B.M. no. 21. II. 6. 12. Original num- 

 ber 75. Collected 7th February, 1921, and presented by the 

 Marquis de AVavriu. 



This very distinct little species, found in company with, 

 and almost mistakeable for, Mus musculus, is I'epresented in 

 the Marqids de Wavrin's collection by four skins and two 

 extra skuds. The species is readily recognizable by its com- 

 paratively daik colour. 



"Tiapped in a house surrounded by bush.'''' — W. 



Galea holiviensis demissa, subsp. n. 



General essential characters as in true boUviensis of the 

 high Andean plateau, but the skull with certain differences 

 in detail. 



Skin no doubt as usual, but no specimen has been sent. 



Skull longer and proportionally nai rower than in boUviensis^ 



