538 MR. G. A. BOTJLENGEB ON BEPTILES AND [June 18, 



to our knowledge of this genus. I am now able to define 17 

 species, for the determination of which the following synopsis has 

 been prepared : — 



Sifno^ms of the Species of Psamraophis. 



I. Scales in 17 rows, exceptionally 19. 



A, Eostral a little broader than deep, well 



visible from above. 



1. Anal entire ; eight upper labials, fourth 



and fifth entering the eye. 

 One prteooular ; five lower labials in contact with 



the anterior chin-shields ; ventrals 170-185 ; 



subcaudals 92-97 1. leithii, Gthr. 



Two prseoculars ; four lower labials in contact 



with the anterior chin-shields ; ventrals 157- 



171; subcaudals 81-104 2. notosticius, Viva. 



2. Anal divided. 



a. Five or six lower labials in contact with 



the anterior chin-shields ; usually nine 

 upper labials, fifth and sixth entering 

 the eye ; prsBocular in contact with 

 the frontal ; ventrals 162-197. 

 Sixth upper labial shorter than the eye, which is 

 more than half the length of the snout; sub- 

 caudals 93-149 3. lachrymans, Eeuss. 



Sixth (exceptionally fifth) upper labial as long as 

 the eye, which is more than half the length of 



the snout; subcaudals 130-158 4. punctulatus,'D. &'&. 



Sixth upper labial as long as the eye, which is half 



the length of the snout ; subcaudals 132 5. trigrammus, Gr\h.v. 



b. Four lower labials in contact with the 



anterior chin-shields ; eight or nine 

 upper labials ; ventrals 151-168 ; sub- 

 caudals 100-108 6. subt(sniatus, Ptra. 



B. Eostral as deep as broad, well visible from 



above. 



1. Nine upper labials, three entering the eye ; 



ventrals 161-173 ; subcaudals 109-127... 7. ioca^M, sp. n. (Angola). 



2. Eight upper labials, exceptionally seven or 



nine, two entering the eye. 



a. Frontal, in the middle, narrower than 



the supraocular; ventrals 157-198; 

 subcaudals 90-116. 



Prseocular narrowly in contact with or separated 



from the frontal, which is as long as or longer 



than its distance from the end of the snout 8. sibilans, L. 



Prseocular extensively in contact with the frontal ; 



snout short, forehead strongly grooved 9. jiircatus, Ptrs. 



Prtvocular separated from the frontal, which is 



considerably shorter than its distance from the 



end of the snout 10. longifrons,'S[gv. 



b. Frontal, in the middle, nearly as broad 



as the supraocular ; praocular not 

 reaching the frontal. 

 Snout nearly twice as long as the eye ; ventrals 

 156-182; subcaudals 75-90 ...., , ,. 11, cowcZawarMs, Merr, - 



