64 



distinct from the deep pit of a true femoral pore. In the typical 

 form of this species there is not the same clear definition of these 

 femoral scales as tliat present iti the Aden specimens, but as the 

 latter also present other slight modifications in their lepidosis, 

 as compared with the types, the differences in question I ascribe 

 wholly to local variation. These Aden specimens have somewhat 

 smaller scales, which is shown by the number round the body 

 being as high as 209 in one and 190 in the other, whereas in the 

 typical form the variation is from 14G to 173, 



They were obtained from tbe hills 50 miles from Aden. 



d". Juv. 



Total length 271 146 



Tail 124 65 



Length oE head 27 16 



Width of head 27 16 



OPHIDIA. 



GLAUCCtNIA. isuiisii, n. sp. 



Two specimens. 



Head rather broad; neck distinctly narrower than the head; 

 snout rounded ; rostral broader thau the nasal, prolonged back- 

 wards nearly on a level with the eyes ; nasal completely divided ; 

 nostril removed from the rostral ; first labial very small, slightly 

 higher than broad, its upper and lower margins nearly parallt-l, 

 aud its breadth slightly less thau that of the lower part of the 

 nasal ; ocular in the labial margin ; supraocular and frontal 

 shields nearly equal. Diameter of the body about fifty times 

 in the total length ; tail ten times in the length. Two hundred 

 and eighty-one scales from the labial margin to the vent, and 

 thirty-six on the tail; fourteen scales round the body. Pale 

 brownish above, nearly white below. 



This species is most closely allied to G. hlanfonUi, Blgr,, but 

 is at once distinguished from it by its much narrower rostral, 

 and by its shorter first labial which is as broad as high, and about 

 equal to the breadth of the lower portion of the nasal ; its body- 

 also is somewhat stouter, and the head is broader aud better 

 defined. 



Total length 250 230 



Tail 25 20 



Diameter of body at middle . . 5 4 5 



