356 BULLETIN 34, UNITED STATES NATIONAL MUSEUM. 



sparsely j)nstulated. Form of cranium variable; widtli at jaws from 

 three and one-fourth to two and two-thirds times in length of head and 

 body; from iDosterior margin of orbit to muzzle three and one-half to 

 nearly four times in same. Olive or ash green above, plain or marked 

 on each side, with blotches in two longitudinal series or stripes of darker 

 and scattered smaller ones on each side of these. Frequently a trian- 

 gular blotch between the eyes. A narrow dark line from snout to eye; 

 a broad postocular vitta to the arm, beneath which is a bar of grayish- 

 white about half the width. Tibia half to two-fifths the length of the 

 body; hind foot and arm from elbow scarcely shorter. 



This species, like the R. pid'eringU and R. curta, is annectant to Oho- 

 rophilus, whose species it represents, as well as its own genus, on the 

 Pacific slope of North America. The diminished web and digital pal- 

 ettes constitute the resemblance ; but they fall, nevertheless, within the 

 range of the Hyla type. The R. regilla is distributed throughout its 

 subregiou and into the adjoining one of Arizona and Lower California 

 under a slightly different form. Southern California possesses another 

 variety along with the typical one. These varieties differ, as do those 

 of the Ghoropliilus triseriatus in the proportions of the head and body; 

 the first a long-headed' and longer- bodied type; the most common, a 

 shorter headed and longer bodied; and the most southern form, a still 

 shorter headed and short bodied, with more varied coloration. 



Head elongate ; widtli enters lengtli of head and body considerably over tliree times j 

 canthusrostralis straight ; a triangular patch between eyes scapularis. 



Head short ; width one-third of length regilla. 



Head short, broad; breadth contained in total length two and two-thirds times; 

 form squat laticeps, 



I can not regard these forms as subspecies. 



Var. scapularis. 



Hyla scaimlaris Hallow, sp. from South California, U, S. Pac. R. E., Rept., X, 350, 

 p. 21. 



Three specimens, said to be from San Francisco, are all that the Museum 

 Smithsonian possesses of this variety, which is proportioned somewhat 

 as the true var. Triseriatus in the Chorophilus of that name. The me- 

 tatarsal bones are more closely bound and the web is less than in other 

 forms. The skin is nearly smooth. Besides the interocular triangle 

 there is a dark dorsolateral band and in one a median dorsal. In one 

 specimen the tibia measures half the distance from the vent to the an- 

 terior angle of orbit, another half-way to end of muzzle. 



This variety has every appearance of a terrestrial animal. It will no 



doubt be found to be connected with the ordinary type by annectant 



forms. 



Var. regilla. 



Hyla regilla B. &, G., Proceed. Ac. Nat. Sci., Phila., vi, 1852, 174, 1853, 301; Girard, 

 Herp., U. S. Expl. Exped., 1858, 60, Vol. in. Figs. 13-18 ; U. S. Pac. R. E. Surv. 

 Rept., Williamson Abbot, 12, PL xxviii, Fig. 3 (bad). 



Hyla scaj] alar Is Hallowell partim, Proceed. Ac. Nat. Sci. Phila., VI, 1852, 183, and var. 

 hyjjocliondrialis, U. S, Pac. R. E. Surv., x., 35 lat., p. 21. 



