KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 55- NIO 3. 17 



seems to be more common in and around Bangkok bas been called S. t. var. 

 Mouhoti. The typical Simotes tceniatus has 19 rows of scales, the posterior head- 

 mark arrovv-shaped, no tail-bars or collar, tongue red and a subocular is rarely present. 

 Simotes tceniatus var. Mouhoti on the contrary has the tongue black at the base and 

 tips, the posterior head-mark heart-shaped, one or two tail-bars and a more or less 

 complete collar. Subocular is also generally present. 



As no real description of this new form has been published, I will give some 

 short notes about it. Nasal divided, portion of rostral visible from above much 

 shorter than its distance from the frontal; suture between the internasals as long as 

 that between the prsef rontals ; frontal a little longer than its distance from the end 

 of the snout, a little shorter than the parietals, loreal longer than deep, one prse- 

 and one subocular, two postoculars, temporals 1 + 2 + 1, anterior not very small, 8 

 upper labials, fourth and fifth entering the eye, four lower labials in contact with 

 the anterior chin-shields which are about once and a half as long as the posterior. 

 Scales i 17 rows, ventrals 143 — 163 anal entire, subcaudals 34 — 46. 



Colour: Grayish brown above, with darker lateral bands enclosing a lighter 

 vertebral line, dark lateral spöts on the anterior parts of the body, confluenting on 

 the posterior part forming a dark streak, a dark interocular band passing through 

 the eyes and extending to the mouth, an oblique dark brown temporal band, descend- 

 ing to the throat, confluent or not with a fairly large heart-shaped nuchal spöt; one 

 or two black tail-bars, lower parts whitish with rather large black squarish spöts 

 which sometimes are confined only to the hinder portion of the body. Tongue black 

 at the base and tips. 



Total length of two specimens = 325 & 308 mm. respectively. 



Length of tail = 54 & 53 mm. respectively. 



24. Hypsirhina plumbea Boie. 



One specimen, near Vieng Pa Pao, Northern Siarn, 23 /s 1914. 

 » » , vicinity of Bangkok, 1914 (M. Smith coll.). 



Siamese name for all fresh water snakes: ngu pla. 



The specimen from Vieng Pa Pao was found in a small ditch and tried to 

 bite fiercely when caught. It has the frontal longer than its distance to the snout 

 and the loreal deeper than long. 4 lower labials are in contact with the anterior 

 chin-shields on one side and 5 on the other. There is no trace of a black line along 

 the middle of the tail. 



Colour above: Brownish olive. 



The second specimen has also the loreal deeper than long and 5 lower labials 

 are in contact with the anterior chin-shields on both sides. The colour above is 

 grayish olive with a well-marked black streak along the middle of the tail. 



K. Sv. Vet. Akad. Handl. Band 55. N:o 3. 3 



