1S70.] ^^^ [Cope. 



either. Gnlar fold moderate, its scales snbequal. Mental scales uniform, 

 smooth. No auricular scales; temporal scales rough. Occipital plate 

 large, longer than wide ; interorbital series three ; muzzle scales large 

 smooth, polygonal, only four rows between canthus rostralis. One canthal 

 scale ; two loreal rows ; nostril between two scales ; labials (large) 5 — 6. 

 Oblique folds on sides of neck. The arm extended reaches the middle of 

 the femur ; the leg, the tympanic drum. Body slender ; tail perfectly 

 flat, wider than the body, with 35 cross-rows of keeled scales, which are 

 only pi'oduced into spines at the edge of the tail. 



Color, blackish olive, gradually lighter to the head, which is thickly 

 black spotted on a green ground. A broad crescentic black collar which 

 is broadly light margined behind, much more indistinctly before. The 

 posterior border is against broadly margined with black behind. Limbs 

 closely green spotted on a blackish ground. Tail uniform brown. Belly 

 black, on the sides dark green, medially, femora dark. 



Total length, 0m.093 ; from muzzle to angle of mandible, .016 ; to col- 

 lar, 021 ; to vent, .06 ; length fore limb, .032 ; of hind limb, .038 ; width 

 head at mandibular angles, 01. 



From Pebas Equador ; J. Hauxwell's collection. 



Tretioscincus l^vicaudus. Cope. sp. nov. 



Scales large, those of both body and tail, entirely smooth. Several be- 

 hind the occipital plates larger than the others. Limbs short. Size about 

 that of the T. bifasciatus. 



Color, a dark clear olive above; paler below, alight green band from the 

 temporal region along the canthus rostralis to the end of the muzzle, and 

 another parallel along the upper lip. No other markings. 



From Occidental Department, Nicaragua. Discovered by J. A. Mac- 

 Neil, a successful exijlorer of that region. Mus. Essex Institute, and 

 Acad. Nat. Science. 



This Ecpleopod, differs from its congener T. bifasciatus Dum. in the 

 absence of carinse on the caudal scales, and in other points, and in the 

 coloration. 



HOMALOCHILUS CHRYSOGASTER, Cope. SV.noV. 



General form quite slender, the head narrow. Scales in forty-three 

 longitudinal series, those of the median larger than the lateral. Occipital 

 and parietal regions covered with numerous enlarged smooth polygonal 

 scales. Two short longitudinal plates represent the frontal ; each is in 

 immediate contact with the superciliary of its side, which exceeds it in 

 length. Three pair of supranasals, the anterior not separated from the 

 anterior nasal ; six scales in two cross rows in the place of the prefrontals 

 bound the superciliaries and frontals in front. Superciliaries undivided. 

 Nasal a little higher than wide, the apex visible from above. Two loreals, 

 the anterior larger ; two prococulars, the superior large, the inferior in 

 place of the summit of the sixth and seventh labials. Four postoculars, 

 the superior bounding the posterior margin of the superciliary. Superior 

 labials fourteen, seventh and eighth entering the orbit. Inferior labials 



