466 PROCEEDINGS OF THE ACADEMY OF [1896. 



folds which diverge distad from the welt and become longitudinal, 

 and are transversely crimped. In the longitudinal direction of the 

 plicie this genus differs from the Tiidee, and it is likely that 

 Ecpleopus and other allied genera are similar. 



In a third type represented by Heteroclonium bicolor* a welt 

 bounds the sulcus on each side. The space between these is marked 

 by a few feeble cross folds, and the borders support a single series 

 of closely placed recurved spines. Genera allied to Cophias are 

 likely to present this structure. 



Of the Lacertidae I have examined the hemipenis in the genera 

 Lacerta, Acanthodactylus and Latasiia. They are bifurcate and 

 bilobate. In each division and proximad to it is an oval area with 

 transverse laminae surrounded by a welt. In Acanthodadyhis one 

 of the areas is marked by longitudinal folds. 



Among the Gerrhosauridae, the hemipenis of Gerrhosaiirusnigro- 

 lineatus has on its distad third, three welts opposite the sulcus, the 

 median larger, all finely cross folded. Between one of these and the 

 sulcus is a tract of coarse papillse ; between the other and the sul- 

 cus the surface is smooth. 



Of the Scincidae I have examined the hemipenis in Trachysaurus, 

 Lepldothyris (femandii), Euprepu (carinatus), Eumeces and Ma- 

 huia. They are smooth and with more or less numerous longitudinal 

 folds, excepting in Trachysaurus. Here the laminae diverge from 

 the sulcus proximad and turn to a horizontal direction, meeting 

 opposite the sulcus in a chevron directed distad. In Eitprepis cari- 

 natus and Eumeces ohsoletus some of the plicaB are cross-ribbed. In 

 Lepidothyris fernandii the organ is shortly bifurcate, and each 

 division has a membranous welt next the adjacent division. 



In the Anniellidae the genus Anniellahas the entire surface from 

 one side of the sulcus to the other, thrown into transverse folds or 



* Heteroclonium bicolor gen. et. sp. nov. 



C}uir. gen. Frontonasal plates separating nasals ; prefrontals and frontoparie- 

 tals absent ; nostril in suture between nasal and first labial plate ; no interparie- 

 tal. Limbs rudimental, two pairs ; digits 4-1, the anterior clawed. No femoral 

 pores. Different from Sesqaipes (type Cop]tias lieteropm Licht. Blgr. ) which 

 has the digits 4-2 ; and Microdactylus when tliey are 3-3. Char, specif. Scales 

 in annuli of 28 scales, which are angular at the extremities, and alternate with 

 those of the adjacent rows. Labials 5-6 ; temporals 2-2-2. Three large pre- 

 anal plates, longer than wide. l"'ail long obtuse, hind legs minute. Anterior 

 digits short, subequal. Brown above, separated abruptly on each side from 

 the darker brown of the sides and lower surfaces. Chin and throat yellowish. 

 Scales of upper surface each with a bluish spot. Total length 130 mm., length 

 to vent 78 mm. Bogota ; Philadelphia Museum Coll. Two specimens. 



