MAMMALIA — RODENTIA. 
53 
end black-tipped ; upper cutting teeth with a deep central groove : 
body 5" 3"' ; tail 4:" 3'" : Afghanistan. 
Much labour has been expended on the group of Burrowing 
Mice. 
Selys placed, in his Faun. Beige, the Hypudceus agrestis as a peculiar 
species. He now recognises his H. fulvus as identical with H. arvalia ; 
but still lingers on the distinctness of the H. suhterraneus. The reporter 
does not know it from observation, but agrees with the opinion of 
Keyserling and Blasius. 
The reporter described a new species from St. Gothard, in Schreb. 
Suppl. iii. p. 576, under the name of H. alpinus, and gave a sketch in 
tab. 191, B. The name of the II , nivalis, of the Paul Horn, was only 
known to the reporter from the Rev. Zool. 1842, p. 347, at the time his 
description was printed, tie has since found, that a diagnosis of this had 
already been given in the preceding number of the Zeitschrift, p. 331, 
from which it is to be concluded, that H. alpinus and nivalis are 
identical. Selys also shows H. neglectus to be identical with II. agrestis. 
Simdevall has given, in the K. Vetensk. Acad. Handl. for Ar. 1840, 
Stockh. 1842, p. 15, a very careful description of the teeth of H. arvalis 
(according to more recent definitions H. agrestis), of II. rutilus and 
glareolus, and of Myodus lemmas, with important remarks on their 
geographical distribution in Sweden. Correct plates illustrate the 
teeth of the known species. Two species have been described by Gray 
in the Ann. x. p. 265 : — 1. Arvicola Roy lei ; rufous grey, beneath grey ; 
hair dark lead colour at the base ; ears moderate, roimd, hairy ; tail 
covered with pale hairs ; first lower grinder has a large rhombic anterior 
process, and three folds on the outer side and four on the inner one ; the 
hinder upper one has three folds on each side, and an elongated lobe 
behind ; body 3^" ; tail 1" 2'" : Cashmere. 2. Arvicola americana, 
like the English Water Rat, but only half the size ; front cutting teeth 
slightly grooved on the outer edge : South America. This is the first 
notice of real Field-Mice being indigenous to South America ; but since 
no authority is given, it may be supposed that an error in the habitat 
has occurred. 
Four new species of North American Burro wing-Mice have been 
described by Bachmann, in the Journal of Philadelphia, viii. 1, p. 60 ; 
and ii. p. 295 : — 1. Arvicola Townsendii ; hairs above lead coloured, 
with dark brown tips, beneath ash-grey ; feet and claws brown ; ears 
large, somewhat projecting ; body 6" ; tail breadth of ear 5'" ; 
from Columbia River. 2. A. fulvus; fur smooth and glossy, above 
chestnut-brown, beneath whitish-grey ; ears and limbs long ; body 
3" 9'" ; tail 1" 4"' : probably from Illinois. 3. A. nasutus ; head and 
nose elongated ; fur above dark rust-brown, beneath dirty yeUo wish- 
97 G 
