158 BULLETIN 160, UNITED STATES NATIONAL MUSEUM 



specimen differed from the original description of Hyla affinis in three 

 important points. According to Baird, in H. affinis the tympanum 

 is two-thirds the size of the eye, the web of hand extends only to the 

 third joint of the second finger, and there is no vermiculation on 

 anterior and posterior faces of hind legs. On the other hand, H. copii, 

 is described by Boiiienger as having a "tympanum hardly one- third 

 the size of the eye, fingers without web, and hinder side of thighs 

 mottled or vermiculated with brown." 



The measurements of the four cotypes of H. affinis (U.S.N.M. No. 

 11410) are, respectively, as follows: Head-and-body length, 41.7, 40, 

 37.2, and 31.8 mm.; transverse diameter of tympanum, 3, 2.8, 2.6, 

 and 2.1 mm.; transverse diameter of eye, 5, 4.9, 4.5, and 4 mm.; 

 anterior edge of eye to nostril, 4.1, 3.8, 3.9, and 3.2 mm. On all four 

 of these cotypes, the transverse diameter of the tympanum is slightly 

 more than one-half that of the eye. Not one of them possesses any 

 vestige of a web between the fingers at the base. The presence or 

 absence of a brownish vermiculation on the posterior surface of the 

 thigh of specimens preserved in spirits is of slight diagnostic value in 

 this species, though as a general rule this area is flesh or orange col- 

 ored in life and normally is without any brown spotting or marbling. 

 In Mexican specimens, at least, the relative size of the tympanum to 

 that of the eye seems to be quite variable. The transverse diameter 

 of the tympanum is generally about one-half that of the eye, occa- 

 sionally as much as three-fourths, and rarely only one- third. 



The five cotypes of Hyliola digueti (M.N.H.P. Nos. 492m, 492n, 

 parchment labels Nos. 98-257, 98-258, 01-343, 01-344, 01-345) were 

 collected by Leon Diguet in the territory of Tepic [ = Nayarit], Mexico. 

 They comprise four adults and one young individual, and all are 

 referable to Hyla arenicolor. The head-and-body lengths of the four 

 adults are, respectively, 41.4, 33, 33.7, and 29.5 mm.; the hind limb 

 being carried forward along the body, the tibio-tarsal joint reaches to 

 between the eye and tip of snout in three individuals, and slightly 

 beyond tip of snout in one; tarsal fold sharp-edged; large inner and 

 small outer metatarsal tubercles; no web between fingers at base; 

 transverse diameter of tympanum slightly more than half that of 

 eye; vomerine teeth in two small groups between the choanae; skin 

 of upper parts coarsely granular. 



Relatively little individual morphological variation, except as noted 

 in the preceding remarks, was observed in the series examined, although 

 considerable color variation was seen. 



Specimens examined. — Ninety-four, as follows: 



