242 ZOOLOGICAL RESULTS OF THE RUWENZORI EXPEDITION. 
and Naia nigricollis Reinh. by the Ruwenzori Expedition, to which we also owe 
the discovery cf a new Tree-Viper, described below as Atheris woosnamni. 
Family AGAMID&. 
1. AGAma ATRICOLLIS A. Smith. 
[Common on the plains around Ruwenzori, but not found: on the mountains above 
5000 feet.—R. B. W.] 
Family LAcERTIDA. 
2. Lacerta JAcKsonI Bler. 
Bouleng. Proc. Zool. Soc. 1899, p. 96, pl. x. 
‘This species was described from a single male specimen procured at Ravine Station, 
Mau Mountains, on the main route from Mombasa to Lake Victoria, at an altitude 
of 7500 feet. Ji was presented to the British Museum by Mr. F. J. Jackson. A 
second specimen, a female, was obtained by the Expedition, on the east side of 
Ruwenzori, at a height of 8500 feet, on the trunk of a tree. 
The head is smaller and shorter than in the type, and the body more elongate, 
these differences being sexual. ‘The granules between the supraoculars and the super- 
ciliaries are reduced to three on the right side and to two on the left ; the occipital is 
much shorter and a little broader than the interparietal; on the left side the parietal 
is in contact with the fourth supraocular and the upper postocular, on the right side 
with the fourth supraocular only. ‘The dorsal scales are very faintly keeled ; 37 scales 
across the middle of the body; 27 transverse series of ventral plates. The hind limb 
barely reaches the axil. Femoral pores 18-19. The belly, in the spirit-specimen, 
is pale blue. 
Measurements :— 
From end of snout to vent 71 mm.; head 17; width of head 11; fore limb 25; 
hind limb 36. 
Judging from the description, I am in doubt as to Tornier’s L. vawereselli (Zool. Anz. 
1902, p. 701) being specifically distinguishable from L. jacksont. The temporal scales, 
perfectly smooth in the Ruwenzori specimen, are feebly keeled in the type. The 
statement “ Nur 8 Femoraiporen an jeder Seite” (p. 702) is contradicted further down 
(p. 703), “ Femoralporen 16 an jeder Seite.” 
Family SciNcipD &. 
3. MABUIA MACULILABRIS Hallow. 
Mokia, S.E. Ruwenzori, 3400 feet. 
