140 Mr, O. Thomas on the Generic Positions of 
PLATE VI, 
Forsiella brevicornis (Van Douwe). 
Fig. 1. First antenna of female. 
Fig. 2. Second antenna of female, seen from the inside (the sete of the 
second joint are seen through). ? 
Fig. 8. Second antenna of female, from outside. 
Fig. 4. First leg of female. 
Fig. 6. Second leg of female. 
Fug. 6. Fourth leg of female. 
Fig. 7. Fifth pair of legs 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. 
i 
bo 
Fig. 12, First antenna of male—last two joints seen from inside. 
Priate VII. 
D’ Arcythompsonia scotti, sp. n. 
Fig. 1. Second antenna of male. 
Fig. 2. Mandible palp. 
Fig. 3. First leg of female. 
Fug, 4. First leg of male (rather more magnified). 
Fig, 5. Fourth leg of female. 
Fig. 6. Last two joints of external branch of third leg of female. 
Fig. 7. Second leg of male. 
Fig. 8. Fourth leg of male. 
Fig. 9. Last abdominal segment and furea of female. 
Fig. 10. Operculum and furcal ramus of male. 
Fig. 11. Protuberance of dorsal side of second abdominal segment of 
male. Seen from side. 
Fig. 12. Fifth leg of female. 
Fig. 18, Second leg of female. 
XV.—The Generic Positions of “Mus” nigricauda, Thos., 
and woosnami, Schwann. By O.prisitp THomas. 
(Published by permission of the Trustees of the British Museum.) 
Wuen 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 for further consideration. My attention has now, 
however, been called to a species which was one of the first 
I ever described +, “ Mus nigricauda,” based on a single 
Namaqualand specimen that has more recently been re- 
inforced by a number collected by Dr. Ansorge and Mr. 
* Ann. & Mag. N. H. (8) xvi. p. 477 (1916). 
+ P. Z. S. 1882, p. 266, pl, xiv. fig. 1. 
