490 



PROCEEDINGS OF THE NATIONAL MUfiEUM. 



tlM5 Sierra Nc.vjkIji and l*aiiainiiit Moimtai iih, Ih one of niu(;li more decided 

 webbing and larger di.skM (lig. 10). ^riie web seemH to arise from the 

 middle of the lirst ])halaux of the fifth toe, though really fringing it to 

 the disk, and after the Hweep back runs to tlie Joint between tlie first and 

 Hceoud phalitngesof the fourth toe, though keeping rather close to the 

 second i)halanx. I*'rom here, agiiin, it Iringes tlie lirst iihalaiix of the 

 third toe to the disk, and in like manner the others. The existent type 

 Hjiecimens of rcfjiUa belong in this category. 



From the various data given there seems to be but one coiujlusion 

 to draw — which is, that the various species of Pacific hylas described 

 within the last forty-live years appejir to have been established on insulli- 

 cient (iharacters, and intc-rgrade to such a degree as not to be specific- 

 ally or even subspecitically separable. Although northern specimens 

 may seem to be lighter and to have narrower heads, and desert speci- 

 mens to be darker and shorter limbed, and in spite of all the numerous 

 dillerences in color, in proportion, and in webbing, still all intergrade 

 and are finally referable to one species, Jlyla re<jilla of Baird and (iirard. 



In coiKjlusion, 1 wish to express my dee]) obligation to Dr. Leonhard 

 Stejneger, (Mirator of the reptile department of the U. S. National 

 Museum, for the opi)ortunities he has afiorded me for studying these 

 forms, and various kindnesses and aid in the preparation of this paper. 



I append a list of the specimens of llyla re(jiUa in the LJ. S. National 

 Museum. 



IAhI of Hpecimens of Jlyla regiUa in U. S. National Museum. 



