178 PROCEEDINGS OP THE ACADEMY OF 



regions, larger than laterals, which are larger than ventrals: last with a sharp 

 mucro, and one or two emarginations. Tail cylindrical ; femoral pores only 

 two or three. Parietals large ; interparietal longer than broad. Frontal and 

 frontoparietal broad; former longer, uudivided. Divided frontonasals and in- 

 ternasals in contact ; supraorbitals in contact with both marginals and super- 

 ciliary ridge, four on each side. Three pairs infralabials, transverse, the ante- 

 rior barely in contact. Three bordering scales of ear, not larger than those 

 preceding. End of muzzle to ear 11 lines ; ear to vent 3 inches, 5 lines ; length 

 of tail 3 inches; length of anterior extremity 8 lines; posterior 2 inches 7 

 lines ; hind foot 1 inch. Males, above brown, with a yellowish dorsolateral 

 band and seven or eight pairs of yellowish, anteriorly black edged spots on the 

 back. Top of head red ; below whitish ; sides faintly blue tinged. Females 

 brown-olive, with a paler dorsolateral band. Throat, a broadband to shoulders, 

 and sides of abdomen, blue. 



Hab. Near Colima, Mexico ; from the Xantus coll. 



A species to be compared with clarkii, zosteromus and s p i n o s u s, 

 and differing from them and all other species in the fewness of the femoral 

 pores, thus approaching the genus Froctotretus. The frontal is not narrow as 

 in zosteromus, nor the ventrals rounded emarginate as in it and the other 

 species. The supraorbitals are bordered by small scales in s p i n o a u s. 



Sceloporus malachiticus. 



Dorsal scales larger than lateral which are larger than ventral, strongly mu- 

 eronate, in 25 to 28 rows from interscapular to sacral region, fourteen rows 

 between axilla? and eight to ten between femora. Scales before shoulder 

 squamous; marginal ear scales very small ; supraorbitals five, broad, short, 

 separated by small scales from superciliary ridge, and larger scales from nar- 

 row marginals. Parietals small, subtriangular ; interparietal with parallel 

 lateral borders, longer or as long as broad. Internasal broad ; its anterior su- 

 ture nearly straight. Infralabials small ; anterior little or not in contact. 

 Abdominal and gular scales not mueronate, and apparently not emarginate. 

 Lateral scales, even to axilla, strongly mueronate, four times emarginate to ser- 

 rate. End of muzzle to ear 8 lines ; ear to vent 2 inches 5 lines ; anterior 

 limb 1 inch, 5 lines ; posterior limb 2 inches ; tail ? ; sixteen femoral pores. 



General color bright green, with angular dark cross-bars, five or six on 

 each side. Sides of abdomen and throat blue; the latter extending to nape. 



Habitat. Costa ltica, near Arriba, whence the Smithsonian Institution has 

 received specimens, 6492, through Cha3. N. Itiotte. 



This animal is the tropical representative of our S. undulatus, though 

 in general appearance not unlike the formosus. The much stronger mucro- 

 nation and eniargination of the scales, especially on the sides, as well as the 

 color, are distinguishing traits. 



Pbrynosoma a s io. 



Nostrils lateral, in the line of the canthus rostralis. Three or four aeries of 

 lateral gular scales on each side, which are short and subequal. Rostral prc- 

 seut flat semi-discoid. Eight scales on sharp infralabial ridge. Superior labials 

 nine subequal, not produced into horns continuous with temporo-occipital 

 crest. Horns of latter, two diverging temporal, separated from two vertical 

 occipital, which are separated by a depression. One high acute posterior super- 

 ciliary on each side. Auricular opening large, bounded below and behind 

 each by a bunch of spines. Two lateral series, superior large. Pectoral and 

 abominal scales large, keeeled ; femoral pores 7 to 0. A dorsolateral series of 

 very thick spinous processes, and two median dorsal rows of flat mueronate 

 scales, which become four rows of spines on the tail ; one median nuchal row. 

 Femur and tibia with two rows of spines each ; three rows of very strongly 

 keeled plates on e humerus. Tail of tf as long as from shoulder to vent ; i. e., 

 :; inches 4 lines. End of muzzle to ear 1 inch ; to shou'der 1 inch 6 lines ; to 



[Aug. 



