Cope.l lO-i [Oct. 2, 



surrounded by granules. Seven or eight loreal rows ; labials, T 9 ff ; infra- 

 labials all small. Auricular meatus small, but larger than occipital scale. 

 The limbs are slender and long. The anterior appressed reaches the end 

 of the muzzle by the end of the fifth digit ; the posterior reaches the same 

 by the end of the fourth digit. Digital dilatations narrow. Fan small. 



The general color is blackish, below white, the line of junction of the 

 colors on the sides of the belly, and ragged. A pale line across the chin. 



Measurements. M. 



Length of head and body 045 



" to posterior border of meatus auditorius 061 



Width at posterior border of meatus auditorius 0065 



Length of fore leg 021 



" fore foot 0072 



" " hind leg 041 



" tibia 0125 



" hind foot .017 



This species approaches most closely the A. limifrons Cope from Veragua. 

 In that species the facial ruga? have distinct large scales, which are want- 

 ing in the A. macropus, and the hinder legs are not so long. The facial 

 scales are a good deal smaller, and the posterior legs shorter in A. mac- 

 ropus than in the A. trachyderma, which it otherwise resembles. The long 

 hind legs distinguish it from other allied species. 



Ophidia. 

 Typiilops reticulatus L. 

 Boa constrictor L. 

 Rhabdosoma brevifrenum Jan. 

 Rhabdosoma microrhynchum Cope. 

 Contia serrata, sp. nov. 



Rhadin^a nicaga Cope, Lygophis 7iicagus Cope, Proceeds. Phila. Acad- 

 emy, 1868, p. 132. Proceeds. Amer. Philosoph. Soc, 1870, p. 553. 



Scales in seventeen rows, without fossae, all of moderate width, the first 

 not very wide. Eight superior labials, third, fourth and fifth entering orbit ; 

 fifth, sixth and seventh largest, subequal, their superior borders increasing 

 in length in the order named. Rostral plate very small, barely visible 

 from above. Nasal decurved forwards, deeper posteriorly; loreal deeper 

 than long ; ocular 1-2 ; the preocular narrow and widely separated from 

 the fr6ntal above. Temporals 1-2; the anterior in contact with the 

 inferior postocular only. Internasals small, as wide as long ; prefrontals 

 much larger, wider than long. Frontal elongate, truncate in front, and 

 with parallel sides ; parietals long and large, extending on each side to the 

 inferior postocular. Gastrosteges 160 ; anal divided ; urosteges 52. Total 

 length, M. .245 ; to rictus oris, .0065 ; of tail, .070. 



Color above dark brownish-gray. A line of darker color extends along 

 the third row of scales, and a similar one on the eighth row, which leaves 



