ON THE BATRACHIA AND REPTILIA OF COSTA RICA. 



119 



48. Thecadactylus rapicaudus, Houtt. 



Mouth of Estrella or North River, E. coast. 



IGUANIA. 



49. Anolis microtus, Cope, Proceedings Academy Philadelphia, 1871, p. 214. 



Auricular opening not larger than nares. Scales generally larger than in A. 

 insignis ; four rows between orbits, two rows of large ones above orbits ; seven 

 rows between rows of canthus rostralis at middle of muzzle, three loreal rows at 

 middle ; three large smooth infralabial rows. Scales of tail and fore leg three or 

 four keeled. 



Brown with cross-bands of large paler ocelli crossing the sides behind the axilla, 

 at middle, and at crura. Eye and a broad band to shoulder, dark brown. 



Description. — Scales of back, sides, and belly equal and smooth. Tail com- 

 pressed at base, distally cylindric, covered with equal scales. Front without ridges 

 but with well-marked concavity; all the scales covering it equal and smooth. 

 Occipital or parietal region concave, with high lateral posterior bounding ridges, 

 which do not unite, but leave a notch between them (in one specimen). Occipital 

 region covered with small scales. Zygomatic arch prominent, canthus rostralis not 



tubercular. Face well developed. First two 

 others. Limbs short, stout ; anterior not reach 

 angle of lower jaw. Dilatations well developed 



Total length 

 Length to orbit 

 " to ear 

 " to axilla 

 " to groin 



" to convergence of parietal crests 

 " of fore foot .... 

 of tibia .... 



of hind foot .... 

 Width at anterior angle of orbits 

 " at zygomatic arch . 



nfralabial scales larger than the 

 ng groin ; posterior extending to 



M. 

 0.31 



.015 



.03 



•05 



.0955 



.029 



.017 



.0183 



.027 



.0125 



.017 



This species is darker than the next, and is much less ornamented. The color 

 is a rich yellowish-brown; where the epidermis is lost on the head a strong yellow 

 pigment appears, so that it is probable that it could in life change to that color at 

 will. A deep brown band commences by covering the whole eye and extends to 



