1869.] -^"^ [Cope. 



digit very elongate. Anterior toes free; lengths 2-4-1-3. A weak dis- 

 coid abdominal dermal fold. Abdomen very obscurely areolate, medially 

 nearly smooth. 



Color blackish-brown above, sometimes with pale vertebral streak. 

 Femora not marked behind ; above with three oval brown areas enclosed 

 by light lines. A black band between orbits. A dark band from orbit 

 to nostril, and thence to lip ; two similar bands fi'om orbit to lip. Below 

 unspotted white, except gular region, which is brown. 



Length head and body Om. .037 



" "to posterior line tympanum 014 



Width " at canthus oris 0145 



Orbit to end muzzle 0049 



Length fore limb 0215 



" " foot 0105 



" hind foot minus tarsus 0185 



" " limb 064 



Habitat. Two specimens of this new form were sent to the Smithsonian 

 Institution by Dr. Francis Sumichrast from the Pacific region of the 

 isthmus of Tehuantepec, Mexico. 



The collection sent from this locality embraced the following thirty-six 

 species. 



CROCODILIA. 



Crocodilus americakus, Seba ; various large specimens, which dis- 

 play the most remarkable variations in the number and position of the 

 osseous scuta. They exhibit from two to four nuchal scuta, and from 

 two to five cervical. In several specimens scuta of the external dorsal 

 series meet on the median line, excluding the inner pair entirely. 



TESTUDINATA. 



Chelopxjs rubidus. Cope Supra. 



LACERTILIA. 



Heloderjia horridtjm, Wiegmann. 



Cnemidophorus, sp. 



Uta bicarinata, Phymatolepis hicarnatus DumeriL 



SCELOPORTJS SINIPEBXJS, CopC. 



ScELOPORUS VARIABILIS, Wiegmann. 

 ■" Cyclura (Gtenosaum) qxn-squKCAnmATA, Enpaliosaurus quin. Gray. 

 Catalogue of Sauria in Brit. Mus. This region is the undoubted home 

 of this hitherto rare species, as Sumichrast finds it in abundance. Gray 

 was unable to assign its habitat. 



--- Cyclura {Gtenosaura) acanthura, Wiegra. 



Iguana rhinolopha, Saur. Probably only a variety of I. tuber 

 culata. 



Oligosoma gemmingeri, Cope. 



PiiYLLODACTYTUS TUBERCULATUs, Wiegmann. 



