^921^] BARBOUR — REPTILES FROM OLD PROVIDENCE 85 



better placed in Riopa than elsewhere. Bocourt had before him 

 apparently a distinct species of what we have been calling 

 Mabuya, a genus which, to my way of thinking, is perhaps more 

 closely related to some of the sections of Boulenger's Lygosoma 

 than these are to each other. 



Mabuya pergravis sp. nov. 



Type, no. 13,875 A, U. S. National Museum, collected April, 1884, by 

 the Albatross Expedition of 1884. Of three almost identical paratypes, one 

 is now in the Museum of Comparative Zoology. 



Body moderately elongate, limbs pentadfictyl, well developed; the 

 distance between the end of the snout and the fore limb is contained one 

 and three-fourths times in the distance from axilla to groin; snout long, 

 flat, but rounded at the tip; supranasals present and in contact behind the 

 rostral; frontonasal much broader than long, narrowly in contact with the 

 frontal; praefrontals large; frontal shorter than the frontoparietal, and 

 interparietal in contact with one supraocular only; three supraoculars 

 (four in one paratype); six superciliaries, second largest; frontoparietal 

 single (or double); parietals forming a suture behind the interparietal; one 

 pair of enlarged nuchals; five upper labials anterior to the elongate suboc- 

 ular; ear opening medium-sized, round, with no lobules; thirty-four scales 

 around the body; twelve dorsals equal the distance from the tip of the 

 snout to the posterior border of the parietals; the scales are perfectly 

 smooth or very faintly tricarinate; marginal preanals scarcely enlarged; 

 the fore limb pressed forward reaches the ear; the fourth toe is longer than 

 the third; seventeen unicarinate lamellae under fourth toe; tail rather 

 slender, somewhat longer than head and body. 



Coloration. — Rich brown above with scattered black dots, belly lighter, 

 no sharply defined lateral demarcation; an ill-defined dark band for a short 

 distance behind the eye. 



