August, 1910. BATRACHIAXS AND REPTILES MEEK. 407 



Agama colonorum Baud. 



Vol. Nine females, 45 mm. to 100 mm., and eight males, 50 mm. 

 to 106 mm. 



Lukenya. Eleven females, 75 mm. to 100 mm., and seventeen 

 males, 90 mm. to 120 mm. 



Kenya Province. Two females, 45 mm. 



The tail of the males is more spinose and of greater diameter than 

 that of the females, the keels on the upper row of scales are largest and 

 form a low keel which, though present, is less prominent in the males. 

 In some of the larger males the abdomen is dark, the portion about 

 the groin and the under surface of the head is nearly uniform brick- 

 red. In most specimens of both sexes the under surface is light col- 

 ored, except the chin, which is striped or marbled with darker; the 

 tails are banded on some specimens to nearly uniform color on others. 



Agama caudospinosa sp. nov. 



Type No. 2312, P.M. N.H. ; length, body 91 mm., +tail 128 mm.= 

 219 mm.; Lake Elmenteita, B.E.A. 



Head depressed; nostril tubular, directed slightly upward and 

 backward, pierced in posterior part of small nasal, the opening just 

 below the canthus rostralis; upper head scales smooth; a narrow 

 elongate scale on the middle of the snout ; occipital not enlarged ; ten 

 upper labials; sides of the head near the ear and neck with groups of 

 small spines, the longest less than half the diameter of the ear open- 

 ings; ear opening larger than the eye; throat plicate, no gular pouch; 

 body depressed, the back not keeled; dorsal scales imbricate, with 

 weak keels slightly converging towards the vertebral line; dorsal scales 

 smaller than the caudals but larger than on sides and ventral surface ; 

 ventral scales without keels; 45 scales between the origin of the arms 

 to the origin of the legs ; no distinct nuchal crest ; a few nuchal scales 

 with slightly enlarged keels, no trace of dorsal keel, 70 to 85 scales 

 around middle of body ; the fourth finger slightly longer than the third , 

 tip of the fifth extending beyond the first; fourth toe a little longer 

 than the third, the 5th extending beyond the first; tail long, covered 

 with large strongly keeled spinose scales, forming distinct annuli; 

 male with a row of anal pores; tail not keeled above. 



Color dark brownish, with light cross lines or light blotches on 

 rump and tail; under surface of males light to dark brown; under 

 surface of head with the light and dark in slightly irregular longitudi- 

 nal bands. 



This species differs from A. colonorum in the absence of a nuchal 



