140 Mr. 0. Tliomas on the Generic Positions of 



Plate VI. 



Ilorsiella breviconiis (Van Douwe). 



Fiff. 1. First antenna of female. 



Fit/. 2. Second antenna of female, seen from the inside (the •etae of the 



second joint are seen thrnucrh). 



Fig. 3. Second antenna of female, from outside. 



Fig. 4. First leg of fomale. 



Fig. 6. Second leg of female. 



Fig. 6. Fourth leg of female. 



Fig. 7. Fifth pair of leg« of female. 



Fig. 8. Fifth pair of legs of male. 



Fig. 9. Internal ramus of second leg of male. 



Fig. 10. Internal ramus of fourth leg; of male. 



Fig. 11. First antenna of male from the side. 



Fig. 12, First antenna of male — last two joints seen from inside. 



Plate VII. 



D' Arcythompsonia scotti, sp. n. 



Second antenna of male. 



Mandible palp. 



First leg of female. 



First leg of male (rather more magnified). 



Fourth leg of female. 



Last two joints of external branch of third leg of female. 



Second leg of male. 



Fourth leg of male. 



Last abdominal segment and furca of female. 



Operculum and furcal ramus of male. 



Protuberance of dorsal side of second abdominal segment of 



male. Seen from side. 

 Fifth leg of female. 

 Second leg of female. 



XV. — The Generic Positions of " Mus " iii^n-icauda, Thos.^ 

 and woosnami, Schivann. By Oldfield Tiio.mas. 



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



When dividing, some years ago*, the African members of 

 •what is now called Rattus into subgenera, I only dealt with 

 the large and prominent groups of species, leaving isolated 

 forms lor further consideration, ^fy attention has now, 

 liowever, been called to a species which was one of the first 

 I ever described f, '' Mns niijricauda," based on a single 

 Naraaqualand specimen that has more recently been re- 

 iulbrced by a number collected by Dr, Ausorge and Mr. 



* Ann. Si. Mag. N. II. (8) xvi. p. 477 (1916). 

 t P. Z. S. 1882, p. 2(50, pi. xiv. tig. 1. 



