Reptiles and Batrachians. 51 



and fourth entering the eye ; a narrow shield separates the 

 third labial from the loreal ; five lower labials. Twentj- 

 eight scales round the middle of the body. No enlarged 

 prseanal scales. Tail ending obtusely, three eighths of the 

 total length. Dark grey above, with three fine black longi- 

 tudinal lines ; sides and lower surfaces whitish. 



From snout to vent 145 millim. ; tail 85. 



A single specimen from El Paso, Texas. 



Eremias guineensis. 



Snout moderate, obtusely pointed. Lower eyelid scaly. 

 First upper labial in contact with the lower and posterior 

 nasals and the anterior loreal ; frontonasal separated from 

 the rostral by the upper nasals ; two prsefrontals ; two supra- 

 oculars ; two series of small scales between the loreal and the 

 anterior supraocular ; a series of granules between the supra- 

 oculars and the supraciliaries ; no occipital ; no auricular 

 denticulation ; subocular bordering the lip, between the 

 fourth and fifth upper labials ; the three anterior pairs of 

 chin-shields in contact. No gular fold ; collar attached, 

 distinct only at the sides. Scales granular, oval, sixty across 

 the middle of the body. Ventral plates broader than long, in 

 straight longitudinal and transverse series ; ten longitudinal 

 series, outer composed of smaller plates. Two consecutive 

 enlarged prseanals. The hind limb reaches the ear. One 

 series of large and two of small subtibial plates. Twenty-one 

 femoral pores on each side. Upper caudal scales strongly 

 keeled. Head pale brownish above j three black bands, sepa- 

 rated by narrower white ones, on each side along the temple 

 and body to the groin, the two upper continued on the tail ; 

 the lower black band crosses the ear ; a greyish, white-dotted 

 vertebral band, edged on each side by a black line, which is 

 separated from the broader black lateral band by a white 

 line ; limbs black above, with round white spots. 



A single young specimen, from Brass, mouths of the Niger : 

 from snout to vent 24 millim. ; tail 36. 



The origin of this specimen is of particular interest as filling 

 up a gap in the distribution of the genus to which it belongs ; 

 no Eremias had yet been found on the west coast of Africa 

 between the Sahara and the Congo. 



Cacosternum, g. n. (Engystomatidarum). 



Pupil horizontal. Tongue pyriform, free and notched 



behind. Palate toothless, without dermal ridges. Tympa- 



4* 



