94 AMARAL — NEW GENERA AND SPECIES OF SNAKES [^ol^VIu' 



Type, adult 9 , no. 1576 in the collection of the Museu Paulista, caught 

 in Colonia Hansa, State of Santa Catharina, Brazil, in 1902, by the travel- 

 ling naturalist Mr. E. Garbe, in whose honor it is named. 



It is closely allied to S. alternans (Fischer), from which it 

 differs in the color and markings of the head and in having no 

 praeocular, and to S. barbouri Amaral, from which it differs in 

 the markings, in the shape of the frontal and in the number of 

 pairs of chin shields. 



HETERORHACHIS gen. nov. 



Hypapophyses present only in the anterior third of the verte- 

 bral column. Maxillary short, with 15 teeth decreasing in size in 

 front and behind; mandibulary teeth, 19, decreasing in size 

 behind; pterygoids toothful, somewhat long, slightly diverging 

 posteriorly and extending nearly up to the quadrato-mandibular 

 articulation. Head moderate, distinct from the neck; eye large, 

 with round pupil, slightly tending to be vertically elliptic; 

 praeocular present; gulars absent. Body elongate, slightly 

 compressed laterally; scales smooth, without apical pits, in a 

 variable number of rows (15, 16, 17, 18 and 19), the vertebral 

 row differently enlarged; some of the paraventral rows also 

 enlarged; ventrals rounded. Tail moderate; subcaudals in 

 two rows. 



Heterorhachis poecilolepsis sp. nov. 



Snout short, a little longer than the diameter of the eye. Rostral 

 broader than deep, scarcely visible from above; internasals short, twice 

 as broad as long, less than half as long as the praefrontals; an azygous 

 internaso-praefrontal shield present; frontal very short, a little broader 

 than long, as long as its distance from the end of the snout, much shorter 

 than the parietals (4: 7); nasal divided; loreal longer than deep, entering 

 the orbit; a small praeocular between the loreal and the supraocular; 



