8 



In its keeled and non-imbricate dorsal scales it approaches the 

 A. squamulatuSj but it differs in many details of squamation. 

 Thus the latter has sixteen rows of scales on the front, nine 

 rows of loreal scales, six rows between supraorbitals, which latter 

 are not enlarged; lateral scales minutely granular, and ventrals 



about equal to occipital scale. Canthus rostralis well-defined, with seven 

 scales larger than those adjacent. Fourteen rows of scales on widest 

 part of muzzle at base; supraorbitals enlarged, transverse, not continu- 

 ing on muzzle, separated from each other by two rows of flat scales, and 

 from the occipital by four (or three) rows. Seven or eight rows of 

 loral scales, the superior row the largest. Enlarged supraoculars in 

 about three longitudinal rows, diminishing in size externally; the inner 

 row of four scales all weakly keeled. 



Fourteen scales in a presubocular series; superior labials twelve; 

 eleven inferior labials. The infralabial scales are all small and are 

 keeled. Fan large, extending much posterior to line of axillae. Ex- 

 tended hind leg reaches to front of orbit. Twenty-one lamellae under 

 penultimate phalanx of fourth posterior digit. Postanal scuta present. 



Measurements. Mm. 



Length of head and body L 78 



" " " to occiput 21 



Width of head at occiput 13 



Length of fore leg 36 



" " foot 12 



" hind leg 64 



" " fooL ." 26 



Color above purple or violet, below white ( in spirits ) . Numerous 

 small oval darker spots are arranged in longitudinal lines on the back 

 and sides, becoming rounder on the latter, and grouped into transverse 

 agglomerations, producing the effect of bands, which are directed a 

 little backwards as well as downwards. Limbs and tail light purple, 

 with wide dark purple cross bands. Head lighter, spotted with purple 

 above and on the sides. Except some faint traces, the inferior surfaces 

 are unspotted. 



This handsome species resembles those above mentioned, which form 

 the A. laticeps group, which are from the Colombian district of South 

 America, and are the largest species of the continent. In the A. lati- 

 ceps Berth, the scales are all equal. In A. squamulatus. Pet. there are 

 five or six rows between the supraorbitals, which are not enlarged, 

 and the lateral scales are minutely granular, the occipital scale is 

 minute, and the supraocular scales are scarcely enlarged ( Peters ) . 

 The A. frenatus, above described, has much smaller supraorbitals, less 

 numerous frontals, smaller ventrals and a shorter tibia, besides very 

 different coloration. 



The only specimen of the A. purpuresoens which I have seen is 

 No. 4321 of the collection of the United States National Museum, and 

 was collected by Arthur Schott, of the Miehler surveying expedition 

 on the Truando River, New Granada. It is enumerated as Anolis 1 ? 

 reticulatus Gray, in my Report on the Reptilia collected by that expedi- 

 tion in the Proceedings of the Philadelphia Academy, 1862, p. 356. 



