350 Miss B. O. Corfe on Diaplieromera femorata. 



atigular trefoil of Pitymys and tlie simple lounded space of 

 Phaiomys. 2P lias 3 outer and 3 inner angles^ m^ -i outer 

 and 5 inner, but both above and below there is room for 

 difference of opinion as to what should be counted and 

 wiiat not. 



Dimensions of the type (measured on the spirit-speci- 

 men) : — 



Head and body 93 mm.; tail 23 ; hind foot 16"5; ear 9. 



Skull : condylo-basal length 25*5 ; condylo-incisive length 

 26"5 ; nasals 6*6 X 2'9 ; interorbital breadth 4'2 ; palatilar 

 length 13'6 ; palatal foramina 4*6; diastema 8*3; upper 

 molar series (crowns) G'l. 



Hub. Afghanistan. Type from Gulran. 



Type. Adult female in alcohol. B.M. no. 86. 10. 15. 11. 

 Collected 1st April, 1885, by Dr. J. E. T. Aitchison ; 

 presented by the Afghan Boundary Commission. A male 

 from the same place and a skin from " Afghanistan " also 

 examined. 



The Afghan vole has been known for a great many years, 

 owing to the fact that a specimen of it was obtained by 

 Mr. William Griffith during his Mission to Afghanistan in 

 1813, and was included in Horsfield's ' Catalogue of the 

 India Museum ' under the name of " Gohitula meltaday 

 When that specimen came into the British i\luseum and was 

 recognized as a vole, it was determined, with some doubt, as 

 Arvicola mandarinus, Milne-Edwards, by Dr. Bianford, 

 whose determination I followed in my list of the Afghan 

 Boundary Mammals ' (1889). Renewed examination of the 

 specimens with modern knowledge and materials shows 

 that the species belongs to quite a different group from 

 M. mcuidarinus and clearly needs description as new. 



Its nearest geographical neighbour, M. transcaspiciis, 

 Satunin, is a true Microtus, with the fifth and sixth spaces 

 of W] separated, and a wholly different number of angles 

 on wi*. 



XXXV. — On Diaplieromera femorata ( Walkiny-sticJc Insect). 

 By Beatrice O. Corfe. 



The following is a short account of the life and development 

 of the Diapheromera femorata, or walking-stick insect, 

 which I watched with great interest during the summer of 

 1911, keeping them in an insect-cage in a warm room near the 

 window. 



Fouresffs, together with the dried female insect which laid 

 theni; were sent me from Toronto, Canada, in March 1911. 



