TfiACHISOHIUM. 285 



Si/uo2)sis of the tSjyecies. 



A. Scales io 13 rows, those of the ischiadic region 

 keeled in the males. 



a. Prfefrontal shield usually undivided ; one 



postocular; 150 ventrals or more 7'. fii-<ci()n, p. 285. 



b. Pnefroutal shield usually undivided j one 



postocular : 184-145 ventrals T. (juenthcri, p. 285. 



c. Two ]n'tefrontals ; two postoculars T. tetua'cejjs, p. 28G. 



13. Scales in 15 rows, all smooth. 



a. Sixth upper labial largest 7'. nwnticolu, ]). 280. 



b. Last three upper lahials sub equal T. rubriventer, p. 280. 



330. Tracliischiiim fuscum. 



Calamaria fusca and C. obsciu'o-striata, Blyth, J. A.\S. B. xxiii, 1854, 



p. 288. _ 

 Trachischium rugosuui, Gilnth. Cat. Col. Sn. p. 30. 

 Trachischiuni fuscum, Gunth. P. Z. S. 1860, p. 161 ; T/wob. Cat. 



Rept. As. Sue. 3Ius. 1868, p. 45 ; Aiider.^. P. Z. S. 1871, p. 171 : 



Theob. Cat. p. 144. 

 Ablabes fuscus, Gunth. licpt. B. 1. p. 225. 



Kostnil as broad us deep or a little deeper than Ijroad, ^■isible 

 from al)o\e ; suture between the interuasals very short ; pra?frontal 

 usually single ; frontal longer than its distance from the end of the 

 snout, two thirds or three fourtlis the length of the jjarietals ; 

 loreal longer than deep ; one pne- and one postocidar ; temporals 

 1 + 2; 6 upper labials, third and fourth entering the eye, first 

 smallest, sixth largest ; 4 lower labials in contact with the anterior 

 chin-shields : posterioi' chin-shields small. Scales in 1.3 ro\As ; 

 those on the sides of the anal and basicaudal regions obtusely keeled 

 in the male. Ventrals 150-162 ; anal divided ; subcaudals 33-42. 

 Dark broA\n or black above and below, with or without more or less 

 indistinct lighter longitudinal streaks above. 



Total length 20 inches ; tail -I-o. 



Hah. Eastern Himalayas (3000-7000 feet), very common in Sik- 

 him ; Khasi Hills : Rangoon ? {Bhjth). 



337. Trachischium guentheri. 



Trachischium obscuro-striatum (non Blyth), Gilnth. P. Z. S. 1800, 

 p. 101. 



Eostral as broad as deep or a little deeper than broad, visible 

 from above ; suture between the internasals very short ; pra3- 

 frontal usually single ; frontal longer than its distance from the 

 end of the snout, two thirds the length of the parietals ; loreal 

 lono-er than deep ; one prne- and one postocular ; temporals 1 + 2 ; 

 6 upper labials, third and fourth entering the eye, first smallest, 

 sixth largest; 4 lower labials in contact with the anterior chin- 

 shields ; posterior chin-shields small. Scales in 13 rove's ; male 



