32 PROCEEDINGS OF THE ACADEMY OF [Jan., 



to locality and altitude to properly work out this difficult group, so that 

 the above identification must be taken as provisional. Found plenti- 

 fully also at Pecos, Tex. 



Phrynosoma cornutum Harlan. 



Common on the plain all about Alamogordo; a typical species of 

 the eastern Lower Sonoran region and extending well up the Rio 

 Grande Valley in New Mexico. 



Phrynosoma douglasii hernandesi Girard. 



Obtained alDundantly by ]\Ir. Viereck in the Transition and Canadian 

 belts of the Sacramento Mountains. Specimens were also secured for 

 the Academy from Sapello Canon. San Miguel coimtv. N. M.. in August, 

 1901, by Dr. Henry Skinner. 



Mr. Viereck brought home a live individual of this species and kept it 

 in captivity for some time. It proved to be an adult female, and gave 

 birth to thirteen young. He gives me the following information rela- 

 tive to the operation : When first noticed four young had been born, a 

 fifth appeared at 10.05 A.M., and after that one was deposited about 

 every five minutes. The birth was effected by the female standing on 

 her hind legs as high from the ground as possible. There first appeared 

 a drop of clear fluid, followed by a bubble-like transparent membrane 

 containing the young, which is then entirely discharged and dropped, 

 the operation taking less than two minutes. If the young is perfect it 

 will soon begin to wriggle, and will clear itself of the membrane in about 

 five minutes from birth. The young are at first narrow and cylindrical, 

 but as soon as they begin to inhale air they become broad and flat like 

 the adult, and darken in color. They measured at birth 16X10 mm. 



Some were evidently born prematurely and showed no signs of life; 

 they were doubled up and surrounded by a glutinous mass. 



Anota modesta (Girard). 



Very common on the plains about Alamogordo. This is another 

 species of the Lower Sonoran of central Texas, and a number are in Mr. 

 Brown's collection from Pecos. 



Cnemidophorus gularis B. and G. 



Abundant in the canons, but not found in ine desert regions about 

 Alamogordo, where its place is taken by the following species. To the 

 westward the relative distribution of the two remains the same, C. gularis 

 occupying the Upper Sonoran of Arizona east of Tucson, while C. tes- 

 sellaUis spreads over all the Lower Sonoran desert areas and, according 

 to Dr. Merriam, pushes up some distance into the L'pper Sonoran of the 



