206 [ DECEMBER, 
On a New Genus and three New Species of Reptiles inhabiting North Americas 
By Epwarp Hatiowett, M.D. 
LAMPROSAURUS, Hallowell. 
Gen. Char. Head conical, pointed, rostral vertical, the supra-nasals on each 
side contiguous; internasal large; nostrils between two nasal plates; two 
fronto-parietals ; tympanum depressed ; a few small scales.in front of the ear; 
no gular fold; body and extremities slender; toes 5-5; scales smooth and 
shining, similar upon back and abdomen, rounded posteriorly; preanal scales 
letee no femoral pores; no palatine or sphenoidal teeth ; body and extremities 
slender. 
LAMPROSAURUS GUTTULATUS. 
Sp. Char. Body and upper surface of extremities black; a row of seven or 
eight white spots along the margin of the upper jaw; a row of white spots 
along the inferior margin of the supra-orbitar plates, continuous with which 
is a white spot upon the fronto-nasal, and another upon the parietal plates ; 
the rest of the upper surface, sides and front part of the head, are jet black, 
with the exception of a small white spot along the upper margin of the third 
supra-orbitar,and one which is indistinct upon the freno-nasal plate; chin black ; 
throat, abdomen and under surface of extremities iron grey, with a shining 
lustre. Total length 2 inches 6 lines. 
Description. The head is elongated, conical and pointed, rounded above and 
in front; the rostral plate is vertical, pentangular, not grooved inferiorly, a little 
larger, apparently, in the vertical direction than transversely ; there are two 
nasal plates, with the nostril between them ; there are two supero-nasals, one on 
each side, contiguous, rhomboidal; the internasal is large, in contact laterally 
with the supero-nasal and the freno-nasal plate; in front with the supero-nasal, 
posteriorly with the fronto-nasal; the fronto-nasal are pentagonal, larger than 
the supero-nasal, their internal angle prolonged ; they are in contact anteriorly 
with the inter-nasal and the freno-nasal; laterally with the freno-orbitar and the 
anterior supra-orbitar; posteriorly with the frontal; the frontal plate is long 
and hexagonal, broader in front, excavated laterally; the fronto-parietal are 
large and quadrilateral, larger than the fronto-nasal; the inter-parietal is broad 
and rather short, rounded posteriorly, the anterior angle passing in between the 
fronto-parietals ; the parietals are large; there are five supra-orbitar plates, the 
third the largest; there are seven superior Jabials on one side and eight on the 
other, the last the largest; body and extremities slender; tail, according to Dr. 
Hammond, nearly as long as the body (mutilated in the specimen;) fourth toe 
much longer than the third, and stouter; third and fourth fingers of nearly equal 
length; body covered above with smooth imbricated scales, broad and rounded 
posteriorly ; the scales upon the abdomen are similar to those upon the back ; 
no femoral or anal pores; chin, throat and extremities covered with smooth 
imbricated scales. 
Color. Body and upper surface of extremities black; a row of seven or eight 
white spots along the margin of the upper jaw; a row of white spots along the 
superior margin of the supra-orbitar plates, continnous with which is a 
white spot upon the fronto-nasal, and another upon the parietal plates; the rest 
of the upper surface, sides and front part of the head is jet black, with the 
exception of a small white spot along the upper margin of the third supra- 
orbitar, and one, which is indistinct, upon the freno-nasal; chin black; 
throat, abdomen and under surface of extremities iron grey, with a shining 
lustre. 
Dimensions. Length of head 4 lines; greatest breadth 2} lines: length of 
neck and body 1 inch; of anterior extremity 7 lines; of posterior the same ; 
of tail about 1 inch 2 lines. 
Habitat. New Mexico, Fort Fillmore, below the Jornada del Muerte; found, 
also, at El] Paso; rare, Dr. Hammond having seen but two specimens. 
