216 -SOME CHINESE VERTEBRATES. 
palatal length, 14.3; zygomatic breadth, 15.5; mastoid breadth, 12; interorbital 
constriction, 4.6; mandible from condyle to tip of incisor, 18.4; greatest vertical 
height of mandible at tip of coronoid process, 9; alveoli of upper molar row, 6.7; 
alveoli of lower tooth row, 6.8. 
Remarks: — The relationship of this species is undoubtedly with M. melano- 
gaster. The enamel pattern of the molars is essentially similar and the coloration 
not so brown as is that of M. aurora. The presence of a distinct median spine 
at the posterior edge of the palate is apparently unusual in the subgenus and 
recalls the condition in the subgenus Anteliomys, between which and Eothenomys 
the new species may be somewhat annectent. 
The fur of M. melanogaster is close and short, recalling that of the subgenus 
Pitymys, and this in connection with the small ear may indicate that the species 
is more subterranean in its habits than MW. aurora or M. mucronatus in both of 
which the fur is long and soft and the ear larger. From the former, M. mucrona- 
tus is at once distinguished by its blacker coloration, quite without the rusty 
tinge above and the brassy reflections, while the belly is blacker much as in 
melanogaster. The slight but constant differences in the shape of the enamel 
folds of the molars, as well as the more massive skull with the deep palatal grooves 
and prominent median spine are further striking differences. 
In addition to the type, Mr. Zappey obtained three other specimens, all 
at Tachiao, western Szechwan, where however, he did not find any other species 
of the subgenus. Milne Edwards in his original description of melanogaster 
remarks on what he calls a brown phase of that species, occurring in the same 
localities and it is not impossible that these brown animals are really the new 
species here described. The skull, figured of natural size, seems to be a trifle 
larger than that of our specimens of melanogaster, but the details of structure - 
as well as the description and measurements given in the text refer clearly to 
the small black species. 
The two species of the subgenus Eothenomys here described do not seem 
referable to any of the half dozen forms lately described by Mr. Thomas from 
western and southern China. 
CRASEOMYS AQUILUS, sp. Novy. 
Type: —Skin and skull No. 7190 M. C. Z., male adult, from Showlungtan, 
Hupeh, China. May 17, 1907, Walter R. Zappey. 
A very brown species, appearing superficially much 
General Characters: 
like a brown Microtus; tail long, more than half the length of head and body. 
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