30 BULLETIN 99, UNITED STATES NATIONAL MUSEUM. 
are externally very similar to comparable specimens of tumbili from 
Ndi and Voi, but the adult female is much smaller. Without more 
material from the region about Mtoto Andei, the exact allocation of 
these specimens is impossible. The adult female may be an under- 
sized example, or, as the forms of pygerythra ee to be very local, 
may represent another race. 
At Ndi Heller found this monkey living in the acacia trees on the 
steep sides of Mount Mbololo, from which they descended daily to 
the small stream near the village to drmk: At Voi they were found 
in fig trees near the banks of the Voi River. He says: “This monkey 
is called by the Swahili ‘tumbili’ and the name has been adopted by 
many of the inland tribes and the resident Europeans for the monkeys 
of the pygerythra group.” ! 
LASIOPYGA PYGERYTHRA CONTIGUA Hollister. 
Plate 10. 
1913. Lasiopyga pygerythra tumbilt HettEr, Smithsonian Misc. Coll., vol. 61, 
No. 17, p. 10. October 21. (Part; specimens from Changamwe; not 
L. p. tumbili Heller from Ndi.) 
1920. Lasiopyga pygerythra contigua HotuistEeR, Smithsonian Misc. Coll., vol. 72, 
No. 2, p. 2. January 22. (Changamwe, British East Africa; type in 
U.S. National Museum.) 
Specimens.—Three, as follows: 
British Hast Arrica: Changamwe, 3 (Mearns). 
This subspecies from the coast region near Mombasa is closely 
related to Lasiopyga pygerythra tumbilc of the Taita Hills, but is 
larger, with smaller molariform teeth, and has a much less sharply 
bicolored tail. The underside of the tail is gray, not tawny yellowish, 
as in tumbili, and the dark gray longitudinal stripe above is conse- 
quently much less well marked. 
The external measurements of the type, an old male, as recorded 
by Mearns are: Head and body, 570; tail vertebrz, 720; hind foot, 
150; ear, 30; head, 122. “Scrotum pale blue.”’ Of a younger male 
Mearns says: “‘ Iris light brown.” 
1 Smithsonian Mise, Coll., vol. 61, No. 17, p.11. Oct. 21, 1913. 
