4:20 JOURNAL, BOMBAY NATURAL HIST. SOCIETY, Vol. XXVI. 



Every individual skull will not always answer to each of these 

 tests, but on the whole there is rarely a case where one is doubtful 

 as to which of the two groups a species should be placed in. 



The most doubtful are the short-tailed mice known as algirus 

 and sinciUijas, which more approach Leggada and have less of the 

 iiiuscidus specialization. But on the whole they are best referred 

 to IIus, in whose geographical area they occur. 



To Mvs therefore I would refer the following, with their sub- 

 species, viz. : — 



mus<'julus, L. bactriamis, Bly. wagneri, Eversm. 



foeroensis, Clarke, gentilis, Brants. muralis, B-Ham. 



algirus, Loche. sincilegus, Pet. 



Leggada would then include : — 



paliari, Thos. famulus, Bonh. coolii, Ryl. 



hooduga, Gray 



(genotype). nitidnlics, Bly. 



and in addition the whole of the African species referred formerly to 

 Leggada (niinutoides, jmsha, &c., &c.) and in recent years by Miller, 

 Heller and Dollman, to M-ks. 



The following new forms may be conveniently described here : — 



Leggada nitidida lioixf^a, subsp. n. 



Size rather greatsr than in true Pegu nitidula ; colour rather 

 paler, the posterior back withoiit the distinctl}^ darker median area 

 usually present in that animal. General colour above rather darker 

 than " drab." J^elow pale gray, the hairs slaty basally, greyish 

 w^hite terminally ; line of demarcation on sides not very sharply 

 defined, often faintly edged with buffy chin hairs white to base. 

 Tail averaging longer than in true nitid/iUa, its length measured as 

 75, 75'5, 78"5, 79, 80mm, in six specimens as compared with a 

 range of G4 to 7omm in eight specimens of nitidula; blackish 

 above, white below, the contrast more marked than in nitidula. 

 Mammae 3 — 2=10 as usual. 



Skull essentially similar to that of nitidida, Ijnt the tendency to 

 a postorbital thickening or projection perceptible in nitidida is 

 more stronglj^ marked, the projection amounting, in old specimens, 

 to heavy thickened ridges, which therefore contradict the formal 

 rule that there are no such ridges in the present group. The}^ are, 

 however, quite short and do not extent back on to the parietals. 

 Palatal foramina extending well between the first lumin^e of m. 

 Incisors as in nitidula more thrown forward, or (rather) less turned 

 backwards, than usual, being about " orthodont " with indices 77° to 

 S6°, most of the species having this index below 75° (opisthodont).* 



* Cf. Ann. Mas-. N. H. (9) I, p. 35 (footnote) I9l8. 



