288 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 53. 



type is apparently lost and Cope did not give the scale formula of the 

 species. There can be but little doubt that Bocourt described and 

 figured the same form as Cope, and the number of ventrals and sub- 

 caudals of this specimen (ventrals 141, subcaudals 120) coupled with 

 the peculiarity of the single prefrontal indicates such a radical differ- 

 ence from either of the other two species as to justify us in retaining 

 A. redimitum as a good species. The diagnostic characters of the 

 three species may be briefly tabulated as follows : 



Doctor Barbour has kindly furnished me with the scale formulas 

 of the three specimens of ^. vittatum and two of A. taeniatum collected 



^^-r^ 



119 



118 



116 



Figs. 116-119.— Aerhyton VITTATUM. 2i x nat. size. No. 5784, U.S.N.M. Typk of (A. BmTTATUM, 

 Cope). Cuba.— 119 eepresents color pattern at about middle of body. 



recently by himself or his collectors in Cuba. They are incorporated 

 in the above table and have materially assisted in clearing up the 

 doubts surrounding these rare snakes. 



I have made no special reference to Anderesoii sArrJiytonquenselii,^ 

 partly because the reference of this snake to Arrhyton seems highly 

 problematical, and partly because its habitat is unknown. It is 

 even probable that the specimens upon which it is founded did not 

 come from the West Indies. A. quenselii has two nasals, no loreal, 

 two prefrontals, two temporals, 153 to 157 ventrals, and 63 to 67 

 subcaudals. 



1 Bih. Svenska Vet. Akad. Handl., vol. 27, sec. 4, No. 5, 1901, p. 15, pi. 1, figs. 5-7. 



