1869.] 



169 



[Cope, 



APPENDIX. 



ZONURUS TROPIDOSTERNTJM, Gope, Sp. noV. 



Char. Scales i|=16, lateral ventral, pectoral and gular keeled, the 

 dorsal keeled and very rngose. Caudal scales trihedral spine-like. Inter- 

 nasal reaching rostral. Dark-brown, yellow below. 



Deser. This species belongs to the typical group and is near the Z. 

 gr i s e u s of the Cape, but differs in many characters. The rostral is in 

 contact with the internasal, whicli is much longer than wide, and of 

 course separates entirely the supranasals. It is well separated from the 

 frontal by the frontonasals. The other head plates are similar, except 

 that there are six rows of temporals, the longest seven deep ; those of the 

 Z. griseus ai-e much larger, including the two marginal auriculars, 

 which are rtidimental in the new species. All the plates of the head are 

 excessively rugose, with longitudinal striae. Upper labials six, the fifth 

 not more elevated than the others ; inferiors, six ; iufra-labials, five ; all 

 in contact, and without larger scales within them. Gular scales in 22 

 series from angles of mandible ; those of the neck abruptly larger, mu- 

 cronate, forming a rudimental collar. Median ventrals nearly smooth, 

 laterals mucronate keeled. No lateral fold ; lateral scales increasing 

 regularly in .size from the ventrals, sub-round, widely separated from each 

 other by minutely granular intervals, strongly muconate keeled. Dorsal 

 scales in 24 series from nape to opposite femur, all strongly mucronate 

 keeled, and rugose ; the median series like the others. Caudal whorls 

 very spinous, the scales not serrate, but striate on the surface. Femoral 

 pores, seven on each side ; preanal plates small, equal, except two mar- 

 ginal a little longer. 



Muzzle to vent m 09" 2'" 



" " ear 04" 4'" 



Fore limb 3" 2'" 



Width head... Cm .02" 



Hind limb " 04" .2" 



" foot " 03" 



Color. Below and upper lip to ear, yellow ; above rich bi'own, with 

 several indistinct blackish cross-.shades, head above, wood brown. 

 Habitat. Madagascar, Mus. Essex Institute, No. 500, 



EXPLANATION OF PLATES. 



PLATE IX. 



Claudius angustatus, Cope. Yucatani Mus. Smithsonian, Proc. A. N. 

 Sci., Phila., 18(J5. This plate with the others presented to the author by 

 Joseph Jeanes. 



■ PLATE X. 



Cachryx defensor. Cope, Proc. A. N. S., Phila., 1866, 124. Yucatan, f^ 

 Mus. Smithsonian. 



PLATE XI. 



Laemanctus alticoronattis, Cope 1. c. 134. Mus. Smithsonian, Yucatan, 



