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than the former. Our largest specimen of Phyllodactylus magister 

 measures 68 mm. in head and body length, while none of our 

 specimens of Phyllodactylus phacophorus reach over 45 mm. 

 from snout to vent. Young specimens of both species are rad- 

 ically different in color; the latter with its conspicuous striping 

 cannot be confused with the former. 



Stenocercus nigromaculatus, new species. 



Diagnosis. — Dorsal scales strongly spinose, slightly larger than 

 ventrals, slightly smaller than caudals; fifth toe shorter than 

 second; a dorsal denticulation. Brownish above with two pale 

 dorso-lateral stripes and a series of dark cross-bars; males with a 

 black Y-shaped mark on the lower chest and abdomen, also a 

 black stripe on the ventral surface of the thighs and across the 

 cloacal region. 



Distribution. — ^Found only in the valley of the Huancabamba 

 River and vicinity; taken at several points near the town of 

 Huancabamba and at Chumaya. 



Type. — Adult male, no. 17,975, Museum of Comparative Zoology; Huan- 

 cabamba, province of Piura, Peru. August, 1916. G. K. Noble. 



Description of type. — Anterior head shields swollen but not keeled; supra- 

 oculars and occipital shields keeled ; epidermal sense organs irregularly scattered 

 over the head shields; nostrils superior; nasals separated from the rostral by a 

 pair of scales; only one scale of the supra-orbital semicircles in broad contact 

 with its mate of the opposite side, but another pair barely meeting; twelve 

 scales in each supra-orbital semicircle; scales between supra-orbital semicircles 

 and the small postnasals of more or less the same size; supra-oculars smaller 

 than the shields on the snout, imbricating and forming about five longitudinal 

 and nine transverse rows; no series of swollen scales separating the supra- 

 oculars from the siipraciliaries ; six very much elongated and obliquely set 

 supraciliaries ; occiput covered with uniform scales of the same size or slightly 

 smaller than those in the supra-orbital semicircles; no distinction between 

 parietal and occipital scales; no pterygoid teeth; ear opening with one large 

 and three small denticulate scales projecting posteriorly from its anterior 

 margin; supra- and infralabials very narrow, the supralabials bordered above 

 by another row of scales broader than themselves; infralabials bordered below 

 by a series of scales about the same width as themselves; four and one-half 

 upper and five lower labials to the middle of the eye ; sides of the neck covered 

 with scales of the same size as those on the dorsum; a pronounced fold im- 

 mediately before the shoulder; a series of five or six enlarged chin-shields; scales 

 of the throat of uniform size and slightly smaller than those on the abdomen; 

 body slightly depressed; a vertebral denticulation formed by scales only 

 slightly larger than those of the back; dorsal scales large, strongly imbricate, 

 sharply keeled and ending in a short spine, the keels forming continuous lines 

 which are somewhat oblique and directed toward the mid-line of the body; 

 ventral scales smooth, pointed but not mucronate, slightly smaller than the 

 dorsal scales; the adpressed hind limb reaches halfway between shoulder and 

 ear; tail more than twice as long as head and body, slightly compressed; caudal 

 scales a little larger than dorsals, keeled, mucronate and forming obhque ridges 

 as in the case of the dorsals. 



Ground-tone brownish to dull green; on each side of the back a pale stripe 

 which becomes fawn-colored just behind the shoulders and fades out in the 

 lumbar region; a series of ten transverse bars of dark brown across the back 

 between these lateral stripes ; the color between these dark blotches varies from 

 fawn-color on the shoulders to greenish toward the tail; a conspicuous vertical 



