190 PROCEEDINGS OP THE ACADEMY OF 



bordered anteriorly by a curved series of six small plates. Plates of the tail 

 strongly keeled above and below : the margins and keels of those of the 

 superior halves of the whorls from the tenth (counting from vent) to the 

 twenty-sixth greatly produced, forming flattened trihedral spines. Temple 

 with flattened, slightly keeled scales. Superior labials eight, last minute, eye 

 separated from the large sixth by a chain of small suborbitals. Frenal and pre- 

 frenal well developed ; prenasals larger than postnasals, in contact medially. 

 Internal longer than broad ; frontonasals large, in contact ; frontal more than 

 half as broad as long ; frontoparietals longer than broad, in contact with a 

 truncate cuneiform interparietal. Parietals large, as long as the anterior four 

 upper labials. An elongate semicircular inter-post parietal. Inferior eyelid 

 scaled. Tympanic meatus, large, vertical. Inferior labials four, narrow ; in- 

 fralabials four, large, two anterior in contact with those of the other ramus. 

 Teeth as in other species tricuspid. Length from symphysis to antepectoral 

 fold 1 in. 6 1., from fold to vent, 2 in. 7 lin., from vent to end of tail 10 in. 

 6 1. Anterior extremity 1 in. 6 1. ; posterior, 1 in. 11 lin. Above bluish- 

 green with about fifteen blackish cross bands ; those upon the nape and rump 

 are narrow, the others broad, dark bordered. Beneath yellowish. Head 

 shaded with yellowish. 



Hab. West Africa, Museum Smithsonian, (No. 5995.) 



The spinous swelling upon the tail of this species is its most characteristic 

 peculiarity. 



Tiliqua dura. 

 ^ Body stout, tetragonal ; sides vertical. Tail tetragonal at base. Head dis- 

 tinct, muzzle narrow, with vertical sides. Rostral plate covering the tip of 

 the muzzle like a cup, its posterior border straight. Nostril in the middle of 

 a subquadrangular nasal. A pair of large supranasals, longer that broad, ex- 

 tensively in contact medially : an elongate frontonasal connects the supra- 

 nasal with the supraocular on each side ; it is separated from its fellow by a 

 shorter pentagonal internasal. One or two minute freno-nasals ; an elongate 

 freno-ocular bounding the second and third superior labial. Vertical (or 

 frontal) elongate cuneiform, truncate anteriorly, extensively in contact with 

 fronto-nasals. Fronto-parietals and parietals moderate ; interparietal cunei- 

 form acute, angled anteriorly. Two crescentic postparietals on each side. 

 Four supraoculars. All superior head plates longitudinally rugose. Six superior 

 labials, four under middle of orbit. Temporal region covered with large 

 keeled scales, the tympanic meatus appearing as a small slit behind the free 

 border of one of the posterior. Thirty rows of scales round the body, the 

 dorsal and ventral in longitudinal rows, the lateral in oblique series which are 

 directed upward and backward ; they are unicarinate, the dorsal tricarinate, 

 the keels very strong. Four large marginal preanals. Three large in- 

 fralabials on each side, beside mental and symphyseal, all in contact with in- 

 ferior labials ; of the latter there are six, the anterior small. Digits unequal. 

 Hinder extremity reaching the elbow ; the scales of its external surfaces strongly 

 keeled, as are those of the fore limb ; tail (reproduced) covered with strongly, 

 keeled scales which form on the upper surface four strong continuous ridges. 

 Length from muzzle to axilla, 9.5 lin. ; from axilla to vent 1 in. 2 1. 



Above dark rusty, the head and a broad interscapular cross-band, also a 

 median dorsal series of spots, and five or six rather large dorso-lateral spots, 

 chestnut. Beneath and upper lip, rusty yellow. 



Hab. Western Africa, Museum Smithsonian, (No. 5996). 



This species is not to be considered a Euprepis, on account of the squamous 

 inferior eyelid : it is quite different from the Tiliqua rufescens in the much 

 stronger carination, the more compressed head, minute auricular opening, and 

 different arrangement of head-plates. 



This species and the preceding, as well as several others previously described 

 iu these Proceedings, must be added to the catalogues of West African rep- 



[April, 



