242 ZOOLOGICAL RESULTS OP THE EUWENZOEI EXPEDITION. 



and Naia nigricolUs Eeinh. by the Ruwenzori Expedition, to which we also owe 

 the discovery of a new Tree-Viper, described below as Atheris woosnmni. 



Family Agamid^. 



1. Agama ateicollis a. Smith. 



[Common on the plains around Ruwenzori, but not found on the mountains above 

 5000 feet.— i?. B. W.'] 



Family Lacertid^e. 



2. Laceeta jacksoni Blgr. 



Bouleng. Proc. Zool. Soc. 1899, p. 96, pi. 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. It 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 35. 



Judging from the description, 1 am in doubt as to Tornier's L. vauereselli (Zool. Anz. 

 1902, p. 701) being specifically distinguishable from L. jacksoni. The temporal scales, 

 perfectly smooth in the Ruwenzori specimen, are feebly keeled in the type. The 

 statement " Nur 8 Femoralporen an jeder Seite" (p. 702) is contradicted further down 

 (p. 703), " Femoralporen 16 an jeder Seite." 



Family S c i N c i D ^. 



3. Maeuia macuui.;Vbris Hallow. 

 Mokia, S.E. Ruwenzori, 3400 feet. 



