24 Br. A. Giinther on new Species of Snakes 



grooved ; loreal shield longer than deep ; anteocular extend- 

 ing on the upper surface of the head, but not reaching the 

 vertical. Two postoculars. Eight upper labials, of which the 

 third, fourth, and fifth enter the orbit. Temporals 1+2 + 2. 

 Scales smooth, in nineteen rows, without pores. Ventrals 201 ; 

 anal divided; subcaudals 92. Posterior maxillary tooth 

 longest, grooved ; anterior mandibulary teeth longer than the 

 succeeding. 



The coloration of this snake resembles that of a PsammopMs 

 or RagerrMs. The ground-colour is a reddish olive ; a darker 

 band, three scales broad, runs from the occipitals along the 

 vertebral line, and is bordered on each side by a series of 

 black specks. A brown band through the eye to the side of 

 the neck, where it becomes indistinct and is continued in the 

 form of two or three darker lines. Lower parts yellow, with 

 a series of black dots along each side of the abdomen. Upper 

 labials yellow, the sixth with a black spot. 



One specimen from Tucuman ; it is 27 inches long, tail 

 7 inches. 



DiPLOTROPiS (g. n. Dryadin.). 



Body and tail slender ; trunk with about 150 ventral shields, 

 which show only very faint lateral keels. Head somewhat 

 elongate, rounded in front, flat above ; eye rather large, with 

 round pupil ; nostril between two shields. Shields of the head 

 regular ; loreal present ; one anterior and two posterior ocu- 

 lars. Scales in fifteen series, on the anterior half of the back 

 elongate, lanceolate, on the posterior rhombic ; many with a 

 single apical pore ; they are smooth^ with the exception of those 

 forming the series next to the vertebral series ; these are prO" 

 vided with a strong keel^ the heels forming a pair of raised 

 lines along the middle of the hack. Anal bifid. The maxil- 

 lary teeth become gradually stronger posteriorly; none are 

 grooved. 



Diplotropis hilineata. PI. VI. fig. B. 



Snout rather depressed. Bostral not extending on the upper 

 surface of the head ; anterior frontals obtusely rounded, not 

 much smaller than posterior. Vertical nearly as long as the 

 snout and as the occipitals, which are rounded behind. Loreal 

 considerably longer than deep ; anteocular extending to the 

 upper surface of the head, but not reaching the vertical ; two 

 narrow postoculars. Labials eight, low, the fourth and fifth 

 entering the orbit. Temporals 1 + 2. Ventrals 144. Green ; 

 the raised keels are black, forming a pair of black dorsal lines, 

 which are indistinct on the foremost part of the body, and dis- 



