108 



ting me the loan of this material while studjdng other South 

 American collections in the American Museum of Natural 

 History. 



Dicrodon barbouri, new species.^ 



Diagnosis. — A medium-sized Dicrodon more Ameiva-like in 

 scutation than the other species of the genus; five enlarged 

 occipitals followed by a row of post-occipitals, median occipital 

 nearly as large as the single fronto-parietal; scales of the back 

 granular, of uniform size from occiput to base of tail; over twenty 

 femoral pores. 



_ Distribution. — Valley of Chira River, and possibly adjacent 

 river valleys in the province of Piura, Peru. 



Type. — Adult male No. 17,972, Museum of Comparative Zoology; edges of 

 thickets near Chira River, Sullana, northwestern Peru. July 30, 1916. 

 G. K. Noble. 



Description of type. — Nostril on the posterior part of anterior nasals; anterior 

 nasals narrowly in contact behind rostral ; f ronto-nasals exactly as wide as long, 

 separated from the loreal by the postnasals and prefrontals which make a 

 contact on each side as broad as the contact of the anterior nasals with each 

 other; prefrontals broadly in contact, their suture less than half the length of 

 either prefrontal ; frontal in contact with the first and second supra-oculars, 

 separated from the third and the posterior half of the second supra-ocular by 

 a single row of small scales; four supra-oculars, the most posterior of the right 

 side split obliquely to form an additional scale ; first supra-ocular in contact with 

 the loreal and also with the supraciliaries ; the other three supra-oculars 

 separated from the supraciliaries by two or three rows of small scales; six 

 supraciliaries on a side; a single fronto-parietal; five occipitals, the median 

 largest and in contact on either side with a pair of somewhat smaller occipitals; 

 posterior to the occipitals a single row of postoccipitals about a third the 

 diameter of the median occipital, this row followed by three or four other rows 

 which grade into the granules of the neck; five enlarged upper labials to the 

 middle of the eye; five lower labials to the same point; between lower labials 

 and chin-shields a wedge of scales, the anterior very much smaller than the 

 posterior and extending forward only part of the length of the first chin-shield. 

 Chin and throat covered with small scales, a broad band of about six rows of 

 larger scales extending transversely across the throat at the angle of the jaw; 

 a collar of larger scales on the neck region, these scales largest in the mid-line 

 and grading off both on the sides and anteriorly. 



Dorsal scales granular, minute, sharply marked off from the large scales of 

 the tail and the enlarged scales on the sides of the appendages; ventral scales 

 in eight longitudinal rows and thirty-five transverse rows; a double row of 

 small scales lateral to the enlarged ventral plates; pre-anal plates enlarged, 

 forming an irregular triangle four scales high and four scales wide at the base, 

 the scales of this triangle alternating with one another; femoral pores in twenty- 

 one and twenty-two rows. Antebrachials in two rows of enlarged scales, 

 continuous with the brachials which are in six rows, the pre-axial scales much 

 the larger and grading into the postaxial ones; under sides of thighs covered 

 with large scales, three rows at the distal end of the thigh and eight at the 

 proximal end; the pre-axial scales much the larger; under side of lower leg 

 covered with three rows of very large scales; first pre-axial toe slightly longer 

 than the fifth; tail covered with a series of keeled quadrangular scales, the 

 keels oblique, but forming for the most part continuous ridges the length of 

 the tail; thirty-one scales around the tail at the fifteenth ring. 



^ Named for Doctor Thomas Barbour, Museum of Comparative Zoology > 

 Cambridge, Massachusetts, well known for his contributions to Neotropica 

 herpetology. 



