APPENDIX. — SNAKES. 251 



the latter covering a part of the side of head, but separated from 

 the labials by the nasal shield ; vertical shield more than twice 

 as long as broad, with rather convergent lateral edges and an 

 acute angle behind ; occipitals moderate, rounded behind. Nasal 

 single, very large, pierced by the nostril, in direct contact with 

 the single anterior ocular; two posterior oculars in contact 

 with a large temporal shield ; two smaller ones behind ; seven 

 upper labials, the third and fourth of which form the lower edge 

 of orbit. The first pair of lower labials forms a suture behind 

 the terminal one, and the hinder edges of these shields are situated 

 nearly in a straight line ; two pairs of elongate chin-shields 

 behind. Scales rhombic, in fifteen rows, smooth ; ventral plates 

 hardly raised on the sides ; anal bifid. Upper parts greyish or 

 greyish brown ; on the sides each scale with two obsolete brown, 

 very small streaks at the base ; on the sides of the front part of 

 back some scales black-edged, forming blackish spots, and more 

 or less confluent behind into a very narrow, undulated line ; 

 under parts entirely white. Length of cleft of mouth \" ; length 

 of trunk 9" ; length of tail 4". 



Page 139. Ccelopeltis lacektina. 

 p. Adult. Mogador. 



Page 141. PSAMMODYNASTES PUF.VERULENTUS. 



k, I. Adult. India. Presented by Captain Stafford. 



I have since convinced myself that four of the specimens 

 mentioned as a variety (p. 141) form a really distinct species, 

 differing from Ps. pulverulerius in the structure of the chin- 

 shields. I call this second species of Psammodynastes Ps. pictus, 

 and it may prove to be a peculiar form from Borneo. 



2. Psammodynastes pictus. 



The first three pairs of lower labials very large, without chin- 

 shields between; forehead and crown with symmetrical, dark 

 purple markings ; occipitals reddish white ; back dark purple 

 colour with pairs of reddish-white spots ; on each side of back a 

 reddish-white band. 



a. Borneo. Presented by Capt. Sir Edward Belcher. 



b. Borneo. Presented by Capt. Sir Edward Belcher. 



c. India. From the Collection of the Zoological Society. 



d. India. From the Collection of the Zoological Society. 



Description. — Habit more slender than in Ps. pulverulentus ; 

 head moderate, distinct from neck, with flat crown, and with 

 swollen front part of the lips ; tail moderate, not distinct from 



