342 Mr. O. Thomas on 
by its broad and conspicuous dorsal stripe. Its nearest 
geographical ally (D. nigrifrons, True, from Kilimanjaro) 
is characterized by having a well-marked coronal stripe in 
addition, besides being much smaller. 
IIl.—Tue Susspecies or Mus nyroxawruvs, PUCH. 
The British Museum now possesses a good series from the 
Gaboon and Cameroons of the handsome rat described by 
Pucheran as Mus hypoxanthus. Compared with these, 
examples from Unyoro (Ansorge) and Nandi (Jackson) indi- 
cate the existence of two well-defined subspecies of that 
animal. 
The three may be briefly distinguished as follows :— 
General colour dark (“sepia”), the rump 
dark rufous. Belly more or less washed 
Wit hebuUbby, mite wyed Sete Mery seer Mus hypoxanthus, 
General colour above as in hypoxanthus, but 
the belly pure sharply defined white... Mus h. bacchante, subsp. 0. 
General colour above pale (between “ tawny 
clive” and “ clay-colour”), the rump 
bright rufous. Belly edged laterally 
Witla DW Lhyaysh ce taess Hlaelek else te lol inla) wee Mus h. unyort, subsp. 0. 
Mus hypoxanthus bacchante. 
Size and general characters of true hypoxanthus. Colour 
above dark, nearly approaching Ridgway’s “sepia” or 
‘olive.’ Rump more rufous, but less conspicuously so than 
in the other forms, and only for a comparatively small area. 
Sides greyish olive. Whole of under surface from chin to 
anus and inner sides of limbs pure sharply defined white, not 
edged laterally with buffy. Rufous nose-spot small, confined 
to the roots of the whiskers and not extending back to the 
eye. Fine hairs of ears rufous; no postauricular patch. 
Upper surface of hands brown, of feet rufous brown, but not 
so rufous as in true hypoxanthus. ‘Tail almost naked, finely 
sealed, blackish above, rather paler below. 
Skull very like that of true hypoxanthus, but rather 
smaller, with narrower and more parallel-sided interorbital 
region, more projecting anteorbital plate, palate ending level 
with hinder edge of m’, with larger bullze, and rather smaller 
molars. 
Dimensions of the type (measured on the skin) :— 
Head and body 159 millim.; tail 170; hind foot (s. u.) 30; 
ear 21. 
Skull: greatest length 38; basilar length 31°5; greatest 
breadth 18:7; nasal length 15; interorbital breadth 5:2 ; 
