156 

 Rana zeteki, sp. nov. 



Type. — No. 10031, Museum of Comparative Zoology, from Barro Colorado 

 Island, Gatun Lake, Canal Zone of Panama. March, 1924. Four para- 

 types. 



Diagnosis. — A Rana closely related to Rana warschewitschii (Schmidt) = 

 Rana caeruleopunctata (auct.) and differing conspicuously in having a wholly 

 black throat, chest and upper belly instead of an ashy-gray venter; dark, not 

 pink, anterior aspects of the thighs; inconspicuously instead of heavily cross- 

 barred tibia; the white stripe on the upper Up extending to beneath the eye 

 instead of to the tip of the snout; the dorsum much less coarsely granular; 

 the feet and webs largely black instead of largely coral pink; a distinctly 

 shorter hind leg and more massive thigh. 



It is hoped that future collecting in Panama may make it 

 possible to say whether this species gradually approaches Rana 

 warschewitschii in the unexplored regions of Panama in Veraguas 

 and the western part of the provinces of Colon and eastern 

 Bocas del Toro. The new type may be a subspecies of the older 

 form but it may equally well be wholly distinct. It is hoped 

 that this and other species may be discussed in a future account 

 of the herpetology of this extraordinary biological reserve. 



This February (1925) while at Barro Colorado Island, an 

 Indian boy engaged in digging out a stump near the laboratory 

 building came upon a small snake. At the time I thought it 

 was a Leptocalamus sclateri Boulenger, so white was its head, 

 but later upon ex'kmining it carefully it appears to be a very 

 peculiar species of Tantilla, apparently with no very near allies. 

 It may be called 



Tantilla albiceps, sp. nov. 



Type. — No. 20600, Museum of Comparative Zoology, from Barro Colorado 

 Island, Gatun Lake, Canal Zone of Panama. Barbour collection. 



Diagnosis. — A small very slender Tantilla with head and nape almost 

 wholly white and with a very high count of ventrals and subcaudals. 



Description. — Head long, flat, depressed, with a snout sUghtly projecting, 

 blunt, almost square, in outline; rostral much broader than high, extending 

 on to top of head for a distance nearly equal to internasal suture; internasal 

 suture a Uttle shorter than the prefrontal suture; frontal broad, roughly hex- 

 agonal, about one- third longer than broad; its length greater than the dis- 

 tance from the tip of the snout; nostril between two nasals, posterior nasal 

 barely in contact with the single preocular; one postocular about the size of 

 the eye or a little larger; temporals 1 + 1, the anterior the larger; 7 supra- 

 labials, 3d and 4th entering the eye; 6 lower labials, the first pair separated 

 by the mental; two pairs of anterior chin shields, about equal in size; scales 

 in fifteen rows, without apical pits; ventrals 185; anal divided; subcaudals 62 

 and the extreme tip of the tail may be missing. Length of body 164 mm., 

 tail 48 mm. 



Color as in life. — Head, nape, belly, under surface and tip of tail ivory 

 white, a faint dusky spot surrounding each eye and extending across the head 

 as two faint Unes on each side of the fronto-prefrontal suture; dorsal surfaces 

 slaty oUve; on the lower scale-rows the dark color shows as innumerable 

 dots with the white appearing between; a cluster of dark dots on the outer 

 end of each ventral. 



