318 Mr. O. Thomas on 



Stlziis conscn'ptus, Nurse. 

 Stizus conscriptus, Nurse, Ann. & Mag. Nat. Hist. (7) xi. p. 522 (1903). 



Hah. Karaclii {Comber). 



This species belongs to the tridentatus group. It differs 

 from hlandinns, Sin., in the absence of the hyaline area at 

 the apex of the wings, the smaller size, tiie colour of the legs 

 and tirst abdominal segment, and the sorae\?hat narrower and 

 longer clypeus. 



XXXIV. — Tioo new Asiatic Voles. 

 By Oldfield Thomas. 



(Published by permission of the Trustees of the British Museum.) 



Microtus ilauSy sp. n. 



Essentially like il^. arvalis, but wiili markedly larger 

 skull. 



Externally very much as in ili. arvalis ; size rather greater ; 

 hind foot attaining 19 mm. s. u. Eur rather softer and 

 finer ; hairs of back (winter) about 12 mm. in length. 

 General colour lined greyish brown, not distinguishable from 

 that of arvalis. Under surface buffy greyish. Tail brown 

 above, greyish white below. Mammae 2 — 2 = 8. 



Skull similar in shape to that of arvalis, but larger in all 

 dimensions ; smoother and more rounded, the ridges and 

 angles less developed, though the anterior corner angles of 

 the brain-case are well marked. Interorbital region broad, 

 smoothly rounded, the oldest specimen with scarcely a trace 

 of commencing ridges. Brain-case large and vaulted. 



Teeth essentially as in arvalis, but larger and heavier. 

 ]\P in one instance out of five with a slight tendency to the 

 development of an extra postero-internal angle. 2P quite as 

 in arvalis, the typical 4 spaces and a C well defined. M^ as 

 in arvalis, except that in all the specimens the reentrant angles 

 on each side of the anterior trefoil meet in the centre, so as 

 quite to shut off the anterior part of the trefoil from its two 

 united ))()Sterior constituents. Numbering the sjiaces of the 

 tooth trom behind forwards therofoie, it may be said to have 

 six closed triangles, a seventh and eighth united, and a small 

 subcircular anterior space. 



Dimensions of the type (measured in the fle»h) : — 



Head and body 115 mm.; tail 43; hind foot li) ; ear 12, 



Skull: condylo-basal length 28'2 ; condylo-incisive length 



