APRIL, 1910. New East ArricAN MAMMALS — OsGoon. 17 
Arvicanthis dorsalis maculosus subsp. nov. 
Type from Voi, British East Africa. No. 17265 Field Museum of 
Natural History. Adult male. Collected April 22, 1906, by E. 
Heller. P 
Characters. Similar to Arvicanthis dorsalis rosalia but upperparts 
more grayish except at the base of the tail and the posterior part of 
the rump; sides, especially toward the flanks marked with fairly 
distinct broken rows of quadrate spots of clay color on a grizzled 
olivaceous tawny ground; nape and shoulders grizzled olivaceous; 
sides of neck and face similarly olivaceous but slightly paler, the deep 
russet ears sharply contrasted; underparts pure creamy white to 
roots of hairs. Skull larger and with decidedly heavier dentition 
than in A. d. rosalia, 
Measurements. Type: Total length 258; head and body 118; 
tail vertebra 140; hind foot 29.5; ear 17. Skull of type: Greatest 
length 31.6; basilar length 25.5; zygomatic breadth 15.7; nasals 
12.2; interorbital constriction 4.7; postpalatal length 11.3; diastema 
7.6; palatine slits 6; upper toothrow 5.9; greatest width m!'2.1. 
Remarks. The type and only specimen of Arvicanthis d. rosalia 
in the British Museum differs so markedly from our small series from 
British East Africa that the separation of the latter is scarcely to be 
avoided although the two forms are geographically near. The type 
of rosalia may perhaps be abnormal, but this scarcely seems probable, 
since it differs from our series not only in color but also in cranial and 
dental characters. 
Mungos ichneumon funestus subsp. nov. 
Type from Naivasha, British East Africa. No 17808 Field 
Museum of Natural History. Adult female. Collected February 1, 
1906, by C. E. Akeley. 
Characters. Similar in color to Mungos ichneumon of northern 
Egypt, the hairs of the upperparts being much more coarsely an- 
nulated than in M., 1. caffer of South Africa. Size slightly smaller 
than in M. ichneumon; skull with shorter nasals and weaker denti- 
tion; width of incisive series reduced; pm?’ and pm‘ relatively weak 
and compressed; postorbital processes relatively broad and heavy. 
Measurements. Type: Total length (dry skin, dressed) 1060; 
head and body 571; tail vertebrae 489. Skull of type: Greatest 
length 98; basilar length 90; zygomatic breadth 49.2; interorbital 
constriction 17.7; median length of nasals 18.9; width between 
outer sides of first upper premolars 16.7; width of upper incisive 
series 9.55; front of canine to back of m* 34.8; length pm? 5.25; 
length pm‘ (oblique) 9.75; greatest thickness pm? 2.5. 
