416 Zoological Society • — 



Specimens of 19 inches in length are reddish-ohve in spirits, with 

 a darker hne along the vertehral series of scales. In a specimen in 

 which this line is very distinct, another similar line is to be seen 

 along each side of the body, between the fourth and fifth outer series 

 of scales. Smaller specimens have those lines still more distinct. 

 The head and the anterior portion of the nape are brownish-black, 

 with a broad yellow band across the occipitals and temporals to the 

 side of the mouth. The lower parts are yellowish. Very large spe- 

 cimens are of a uniform bright gamboge-yellow, the head being dirty 

 light brown, gradually becoming lighter posteriorly ; there are some 

 greyish-ash irregular spots on the side of the head and under the 

 chin, and some minute irregular grey spots on the sides of the belly 

 and on the outermost rows of scales. 



The posterior maxillary tooth is grooved. 



Two specimens were taken at Ilheos ; one is 18 and one 19 inches 

 long. Another large specimen, of which a sketch has kindly been 

 communicated to me by Dr. Wucberer, is from the same place ; it 

 was captured on an open piece of ground before the house of a Cacao- 

 planter, situated some 60 feet above the level of the river and per- 

 fectly dry ; its total length is 4 feet 5 inches, and the length of the tail 

 A\ inches. Its habit is stouter than that of the younger specimen, 

 and it appears to me to be a female. 



Trachycyclxjs superciliaris. (Iguanid^.) 



1 1 Proctotretus Twlsneri, Berthold, Gott. Nachr. 1859, p. 179. 



Occipital plate of moderate size, as large as the eye. Above uni- 

 form brownish-olive (in spirits), yellowish below, a brown band along 

 the lower side of the thigh and before the vent. 



Hab. Bahia. 



Description. — The head is slightly depressed, of moderate width, 

 the snout is as broad as long. The whole of the upper surface is 

 covered with small, irregular shields, that in the middle of the occi- 

 put being the largest, about as large as the eye. The superciliary 

 margin is sharply prominent, continued into the canthus rostralis, 

 and formed by imbricate pointed scales, the point of which is directed 

 backwards. The eyelids are entirely covered with small granular 

 scales. The nostril is situated near the extremity of the snout, before 

 the canthus rostralis, and separated from it by a shallow groove ; it 

 is in a single convex shield. The upper and lower labial shields are 

 narrow, and there are two or three other series of small shields, run- 

 ning above, and parallel to, the upper labials, and covering the loreal 

 region. The lower of those series extends to below the eye. The 

 neck and the temporal region are covered with small keeled scales. 

 The opening of the ear is large, subtriangular, and its anterior mar- 

 gin is provided with six or seven tooth-like plates. The scales on 

 the lower side of the head are small, smooth, and become smaller on 

 the throat, where they form a very indistinct collar. There are two 

 oblique deep folds on the side of the neck, between the tympanum 

 and the shoulder. 



