112. ATKACTUS. 313 



Rliegnops visonlnus, Cope, Proc. Ac. Philad. 180G, p. 128. 



savgii, Fischer, Juhrb. Hamb. TViss. Anst. ii. 1885, p. 'di. 



Adel]iliicus sai-gii, Cope, Bull. U.S. Nat. Mus. no. 3^, 1887, p. 85. 

 visonimis. Cope, I. e. 



Snout obtuse. Eostral small, a little deeper than broad, visible 

 from above ; prsefrontals nearly as long as broad ; frontal nearly as 

 broad as long, as long as its distance from tlie rostral or from the 

 tip of the snout, shorter than the parietals ; loreal at least twice as 

 long as deep ; two postoculars ; temporals 1 + 1, rarely 1 + 2 ; seven 

 upper labials, third and fourth entering the eye ; a single pair of 

 large chin-shields, separated from the symphysial ; in consequence 

 of the great width of the chin-shields, the three anterior lower 

 lalials are much reduced, very narrow. Scales in 15 rows. Ventrals 

 126-144 ; anal divided ; subcaudals 25-43. Pale reddish brown 

 above, with four or five dark brown or blackish longitudinal lines 

 or stripes ; white beneath, with a brown line along the middle of 

 the tail, and sometimes also along the belly. 



Total length 365 millim. ; tail 55. 



Central America. 



a. 2 (V. 133 ; 0. 35). Mexico. M. Sal.S [C.]. 



b. Yg. (V. 126; C. 43). Honduras. Mr. Dyson [C.]. 



c. Hgr. 5> (V. 141; C. Guatemala. Stuttg'art RJus. [E.]. 

 28). (One of the types of R. sargii.) 



d. $ (V. 144; C. 28). ? 



22. Atractus favae. 



Calamaria fav£e, Filippi, Cat. Hag. Serp. Mus. Pavia, p. 16 (1840). 

 Rabdosoma longicaudatum, Dmn. %■ Bibr. vii. p. 106(1854) ; Q'unth. 



Cat. p. 12 (1858) ; Jan, Arch. Zool. Anat. Phys. ii. 1862, p. 15, 



and Icon. Gen. 11, pi. i. fig. 2 (1865). 

 favfe, Jan, II. cc. p. 16, pi. ii. iig. 3. 



Snout rounded. Rostral moderately large, a little broader than 

 deep, just visible from above ; internasals small, broader than long ; 

 prsefrontals broader than long ; frontal as long as broad, as long as 

 its distance from the frontal, much shorter than the parietals ; loreal 

 nearly twice as long as deep ; a small prseocular sometimes present, 

 above the loreal; two postoculars; temporals 1 + 2; seven upper 

 labials, third and fourth entering the eye ; a single pair of 

 moderately large chin-shields, in contact with the symphysial and, 

 on each side, with three lower labials. Scales in 17 rows. Ventrals 

 171-185 ; anal entire ; subcaudals 58-66. Tail long and thick, 

 ending in an obtuse point. Brown above, with darker spots and a 

 rather indistinct darker vertebral line ; yellow (red ?) beneath, with 

 large black blotches, which mostly alternate. 



Total length 420 millim. ; tail 110. 



Brazil ? 



a. 



cS (V, 173; 0. r,i<). ? Dr. GUntlier [P.]. 



h. ? (V. 172; 0.00) ? 



