86 AMARAL — NEW GENERA AND SPECIES OF SNAKES [^ol^Vin' 



and praefrontals a little broader than long; internasal suture more than a 

 half of the praefrontal suture (2.5: 4); frontal more than once and a half 

 as long as broad (5.5: 3.3), once and a half as long as its distance from the 

 end of the snout (5.5: 3.5), as long as the supraoculars and a little shorter 

 than the parietals (5.5: 6.5); parietal suture once and a half as long as the 

 fronto-rostral distance (5.5: 3.5); nasal divided; loreal a little longer than 

 deep; one praeocular not reaching the frontal; 2 postoculars; temporals, 

 2 + 2; 7 upper labials, 4th and 5th entering the orbit; 10 lower labials, 

 5/4 in contact with the anterior chin shields, 1st very narrow, almost four 

 times as long as broad (2.5: 0.75), 5th much larger and in contact with the 

 posterior chin shield, which is longer than the anterior (6.5:5). Scales 

 smooth, with double apical pits, in 17 rows; ventrals, 191; anal entire; 

 subcaudals, 117 pairs. 



Back reddish white anteriorly, gradually changing to bluish gray 

 posteriorly, with a series of dark gray to olive gray bands extending down 

 to the sides of the ventrals; upper surface of the tail entirely bluish gray; 

 head brick-red; parietals with a black longitudinal streak; frontal, supra- 

 oculars and posterior part of the praefrontals spotted with black; inter- 

 nasals and praefrontals brownish red; sides of the head yellowish, some- 

 times slightly dotted with black, its lower surface as well as the belly 

 entirely yellowish. 



Total length, 480 mm.; tail, 140 mm. 



Type, an immature 9 , no. 1844 in the collection of the Instituto de 

 Butantan, sent alive from Pennapolis, in the northwestern part of the State 

 of Sao Paulo, Brazil, by Mr. Nagib Bassil, on December 30, 1919. 



Drymobius rubriceps, which is a very aggressive species, is 

 nearly related to D. boddaerti (Sentzen) and D. brazili Gomes l 

 by its head shields and scales on the body. It can be distin- 

 guished from them by its wonderful color and by the following 

 characteristics which I was able to recognize by examining all 

 the specimens of D. brazili existing in the collection of Butan- 

 tan and a good lot of specimens of D. boddaerti, which came from 

 the Brazilian States of Amazonas, Para and Matto Grosso. 



1 J. Florencio Gomes, Memorias do Instituto de Butantan, 1918, I, 1, pp. 81-83. 



Note: One line of the description of D. brazili, existing in Dr. Gomes's manuscript, 

 was omitted on p. 81 of the above paper, so we must read: "sutura internasal cerca de 

 metade da sutura entre as prefrontaes, frontal cerca de uma vez e meia ..." in place of: 

 "sutura internasal cerca de uma vez meia. . . ." 



