Confined to the 



Sonoran dist. 



312 PROCEEDINGS OF THE ACADEMY OF 



It then appears, from the preceding tables, that the species of this district 

 are of the following distribution : 



Occurring in the Pacific district 6 



middle " 18 



Tab. I 10 



II 6 



III 11 



IV ..... 5 



V 6 



VI 6 * 



44 



We may now institute some comparisons with the Reptile fauna of Cape St. 



Lucas, based on the material obtained by Consul Jno. Xautus ; and give first a 



Tab. VII. Genera common to Cape St. Lucas and Arizona : 

 Caudisona, Uta, 



Trimorphodon, Callisaurus, 



Hypsiglena, Sceloporus, 



Pityophis, Phrynosoma, 



Tropidonotus, Dipsosaurus, 



Eutaenia, Cnemidophorus, 



Fhimothyra, Bufo, 



Masticophis, Hyla. 



Ophibolus, 

 Seventeen, of which five are peculiarly characteristic of the Sonoran dis- 

 trict among those of the Nearctic Region, as per tables iv. v. \ i. 



I have already pointed out (Proc. Acad. 18G1, 305*) that of the sixteen spe- 

 cies of Ophidians of Cape St. Lucas eight are peculiar to it ; as the Hypsiglena 

 of Arizona is probably not different, the number should be reduced to seven. 

 Of the remaining nine there are 



Of the Pacific district, Sonoran, S. Central, 



Ophibolus boylii. Caudisona atrox, Caudisona atrox, 



Trimorphodon lyrophanes, 

 Hypsiglena ochrorhynchus 

 Tropidonotus validus, 

 Eutamia cyrtopsis 

 Phimothyra grahamise, 



Masticophis testaceus, Mastic, testaceus. 

 Stenostoma humile. 



I species. 8 sp. 2 sp. 



Of the Lacertilians, of which no synopsis has hitherto appeared, there were 

 fourteen in the Xantusian collections. Of these there were 



Confined to the Cape, Also Sonoran, Represented in Sonoran 



Diplodactylus unctus Cope, Uta stansburiana, by 



Phyllodactylus xanti C, Dipsosaurus dorsalis. 



Uta nigricauda C, 

 " thalassina C, 

 Callisaurus dracojitoides Blv. C. ventralis Hall., 



S cloporus zosteromus C, S. clarkii B., G. 



Phrynosoma coronatum. Blv. 

 Ctenosaura hemilopha, C, 

 Cnemidophorus niaximus, C, 



" hyperythrus C, 



Xantusia vigilis Bd. 



II sp. 2 sp. 2 sp. 

 Gerrhonotus multicarinatus Blv., one sp., belonging entirely to the Pacific 

 district. 



* In enumerating the Ophidian genera of Central America in the same connection, by a lapsus 

 calami Hydrodipsas waa written instead of Hydromorpfius Peters,and not properly corrected. The 

 former is really Kast Indian (Malaccan), and is the same as that previously named Cantoria by 

 Girard, a fact apparently not before noticed. 



)ct. 



[Oc 



