36 OPHIDIANS. 
No. 10. H. herp. erista galli (the Cockscomb Langaha), 
a Madagascar variety, bears an appendage on its head like 
a cock’s comb. 
No. 11. The Hl. eunectes marina (Wood), is a Brazilian 
variety, called Traga-venado, or deer-swallower, or anaconda. 
This should be called H. ewnectes python. It is found in 
great abundance in the pampas of the great valleys of South 
America. The Boa Constrictor of Brazil, called Boiguaeu, 
differs little, if at all, from the preceding. 
Krefft gives, No. 12, H. cerberus australis, and No. 13,- 
H. myron Richardsonii, as the Australian varieties. South 
American varieties are exceedingly numerous, but not clas- 
sified. 
NINTH GENUS—PSAMMOPHIDA. Boie. 
Desert Snakes, peculiar to the great deserts, and dry arid 
places. 
Body elongate or stout; pupil round or vertical; loreal region con- 
cave; one of the four anterior maxillary teeth is enlarged, the last tooth 
grooved. 
First Species—Ps. condonarus, Russell; for description see 
Col. cor. lineatus, page 31. 
Second Species—Ps. pulverulentus, Giinther. 
Third Species—Ps. psammophylax rhombeatus (Schaap- 
sticker) is a New Holland variety. No varieties have been 
classified as yet under Australian species, 
TENTH GENUS—DEN DROPHIDA. 
Tree Snakes. 
Body and tail much compressed, or very slender; head elongate, snout 
obtuse or rounded, pupil round; no fanglike tooth in front. 
7 a ee, oe 
