1881.] Himalayas, Tihet and Afghanistan. 117 



The following- Indian and Himalayan rats and mice have been incor- 

 rectly referred to the genus Arvicola : — 

 Arvicola indica, Gray and Hardwiclae, Illustrations of Indian Zoology, I, 



pi. 11 ; = litis (Nesokia) liardwiclcii. 

 Arvicola bengalensis, Gray and Hardwicke, Illustrations of Indian Zoology, 



II, pi. 21 ; = Mus (Nesolcia) bengalensis, [= Nesolcia indica, Blyth 



and Jerdon; Mas (Nesolcia) blythianus, Anderson.] 

 " Arvicola ? Neotoma, two sp n., pyctorliis and myothrix, nob.," Hodgson, 



J. A. S. B., 1841, X, p. 915. 

 "Arvicola? myothrix, Hodgson," Horsfield, P. Z. S., 1856, p. 401. 



These are the species very imperfectly described by Hodgson (Ann. 

 & Mag. Nat. Hist. 1845, XV, p. 267) as Mus ? pyctorhis and Mus ? myo- 

 thrix. The former proves, on an examination of the type in the British 

 Museum by Mr. Thomas, to have been founded on an aberrant individual 

 of the common house and tree-rat of India (Mus rufescens auctt.), and 

 belongs to the form called Mus cequicaudalis by Hodgson. The type of 

 Mus myothrix is a skin without any skull ; but I have no hesitation in 

 identifying it with Golunda ellioti, to which an affinity was suggested by 

 Jerdon ('Mammals of India,' p. 214). 



"Arvicola? hydrophilus, Hodgson," Gray, List of the Specimens of 

 Mammalia in the British Museum, 1843, p. 119. 



This is Mus ? hydrophilus, Hodgson, Ann. & Mag. Nat. Hist. 1845, 

 XV, p. 267. No original type can be found, and it is quite uncertain what 

 the species is. Mr. Thomas has endeavoured to identify it, but in vain. 

 The figure in Hodgson's drawings shows a large mouse or small rat with a 

 pure white belly, and might well be taken from a young individual of the 

 common white-bellied Himalayan rat, Mus nitidus (— Mus rufescens, var.), 

 or of Musjerdoni (Leggada jerdoni, Blyth : this species is not a true 

 Leggada). 



Note. — The teeth figured in the accompanying plates are those of the 

 right upper and right lower jaw, the anterior extremity uppermost, and the 

 upper jaw teeth above the lower. It results from this arrangement that in 

 the upper figures (upper teeth) the outer or external angles are to the left, 

 the inner to the right ; whilst in the lower figures (lower jaw) the reverse 

 is the case, the outer side of the jaw being to the right, the inner to the 

 left. All the figures are enlarged 8 diameters. 



16 



