8o PATAGONIAN EXPEDITIONS: ZOOLOGY. 



terial for comparison, however, it did not seem desirable to make the 

 separation suggested, and which Mr. Thomas has since made. 



Akodon (Chelemys) michaelseni (Matschie). 



Hesperomys [Acodon) michaelseni Matschie, Hamburger Magalhaensische 

 Sammelreise, Saug., 1898, 5, pi. figs, i, i a-Ii, animal, ear, hand 

 and foot, and skull. "Slid. Patagonien, Punta Arenas." — Thomas, 

 Ann. & Mag. Nat. Hist. (7), XII, Aug., 1903, 343 (in text, suggest- 

 ing it is probably a Notioniys). 

 Adult {]2s\.Vi2ccy). — Pelage short, thick, soft. Above uniform dusky 

 brown ; ventral surface similar but lighter with a slightly grayish instead 

 of brownish hue. Ears short, wholly concealed in the fur ; upper surface 

 of fore feet rusty brown; of hind feet dull brown, with a slightly rusty tone. 

 Claws of fore feet very long, as in A. megalouyx. 



Measurements. — Total length, 142 mm.; head and body, 97 ; tail, 45; 

 hind foot (without claws), 19; ear, 11. Skull, total length, 27.6; basal 

 length, 24; greatest breadth, 13.4; interorbital breadth, 4.8; length of 

 nasals, 12; palatal length, 11; diastema, 7; palatal foramina, 5.6: upper 

 molar series 3.5. (Measurements from Dr. Matschie, /. c.) 



Represented by a single specimen, without skull or measurements, of 

 apparently an adult male, taken Jan. i, 1898, by Mr. Colburn at Punta 

 Arenas, the type locality of the species. In size, proportions, and texture 

 of pelage it closely resembles Akodon niegalonyx, but differs in its very 

 much darker coloration, both above and below. 



Its identity with Dr. Matschie's Akodon michaelseni, described and 

 figured from a single female specimen, also taken at Punta Arenas, is 

 almost beyond question, as is also its distinctness from A. megalonyx. 

 The species is apparently thus far known only from the specimens here 

 mentioned. It is here referred to the subgenus Chelemys with some hesi- 

 tation. Mr. Thomas (/. c.) has recently suggested that it may be refera- 

 ble to Notiomys. 



Genus NOTIOMYS Thomas. 



Notiomys Thomas, in Milne-Edwards, Miss. Scient. du Cap. Horn, VI, 

 Zool., Mamm., 1890, 24. Subgenus of Hesperomys. Type, Hes- 

 peromys [Notiomys) edwardsii Thomas, sp. nov. — Thomas, P. Z. S., 

 1896, 1020 (full genus). 



