32 BULLETIN 99, UNITED STATES NATIONAL MUSEUM. 
LASIOPYGA PYGERYTHRA ARENARIA Heller. 
Plate 13. 
1910. Cercopithecus pygerythrus johnstoni RoosEve tt, African Game Trails, Amer. 
ed., pp. 474 and 481;! London ed., pp. 486 and 492.1 (Part; not of 
Pocock.) 
1913. Lasiopyga pygerythra arenaria Heiter, Smithsonian Misc. Coll., vol. 61, 
No. 17, p. 11. October 21. (Merelle water holes, Marsabit Road, British 
East Africa; type in U. S. National Museum.) 
Specimens.—Kighteen, from the following localities: 
British East ArricaA: Engare Ndare River, 12 (Heller); Isiola 
River, 1 (Heller); Marsabit Road, 1 (Heller); Merelle River, Marsabit 
Road, 1 (Heller); Mount Gargues, 2 (Heller); Northern Guaso Nyiro 
River, 1 (K. Roosevelt). © 
This subspecies, which seems to be confined to the region north of 
Mount Kenia, is very much like Lasiopyga p. callida in general 
appearance but differs in having the black of the feet in old males 
less extensive and more mixed with the grayish buff of the limbs, 
which sometimes extends in a narrow, median line down to the base 
of the toes. The tail is much lighter colored than that of L. p. 
rubella from the southern side of Mount Kenia. 
The Rainey Expedition found this monkey abundant along the 
Northern Guaso Nyiro and throughout the desert to the northward 
wherever water was available. It was commonly seen in small 
troupes in the large, flat-topped acacias and came daily to the water 
holes to drink. 
LASIOPYGA ALBOGULARIS KIBONOTENSIS (Lénnberg). 
1892. Cercopithecus albogularis TRUE, Proc. U. S. Nat. Mus., vol. 15, p. 448. 
October 26. (Not of Sykes.) 
1908. Cercopithecus albogularis kibonotensis LONNBERG, Sjéstedt’s Kilimandjaro- 
Meru Exped., Mamm., p. 3. (Kibonoto, German East Africa.) 
Specimens.—Three, as follows: 
British East Arrica: Taveta, 3 (Abbott). 
Elliot has used the spelling “albigularis”’ for all the races of this 
monkey and quotes the word in that form from Sykes. As a matter 
of fact, Sykes uses the word albogularis consistently in both his first ? 
and second * papers on this monkey, and the change is therefore 
imadmissible on grounds that a typographical error has been made. 
1“ johnsoni.”’ 
2Proc. Comm. Sci. and Corr. Zool. Soc. London, 1831, p. 106. 
3 Idem, 1832, p. 18. 
