MEXICAN TAILLESS AMPHIBLA.NS 157 



1866. (Hyla) arenicolor Cope, Journ. Acad. Nat. Sci. Philadelphia, n. s., vol. 6, 

 pt. 1, p. 84, July.— DiCKERSON, 1906, The frog book, pp. 122, 123, pi. 48, 

 figs. 143-146.— Stoker, 1925, Univ. California Publ. Zool., vol. 27, pp. 203- 

 215, pi. 2, fig. 4; pi. 13, figs. 37-39; text figs. Z, LL. 



1887. Hyla copii Boulenger, Ann. and Mag. Nat. Hist., ser. 5, vol. 20, no. 115, 

 p. 53, July (El Paso, Tex.). — Boulenger, 1888, Ann. and Mag. Nat. Hist., 

 ser. 6, vol. 1, no. 3, p. 189, Mar. — Gxjnther, 1901, Biologia Centrali- 

 Americana, Reptilia and Batrachia, p. 266, pi. 70, fig. C, June. 



1888. Hyla coper [Cope], Amer, Nat., vol. 22, no. 253, p. 80, Jan. [errore typogr.]. 

 1899. Hyliola digueti Mocqtjard, Bull. Soc. Philom. Paris, ser. 9, vol. 1, no. 



4, p. 165, pi. 1, fig. 4 (territory of Tepic, Mexico). 

 1905. Hyla copei Gadow, Proc. Zool. Soc. London, vol. 2, p. 194. 



Type locality. — Northern Sonora, Mexico. 



Range. — From northern boundary of Sonora and Chihuahua 

 southward to Michoacan (Tupataro) and to Guerrero (Chilpancingo), 

 to the Federal District (Tacubaya), and to Vera Cruz (Presidio near 

 Motzorongo, about 20 miles south of Cordoba). Of the three Mexi- 

 can hylas that occur within the limits of Southwestern United States, 

 this rough-skinned species is the most widely distributed, occurring 

 from southern Utah to northern Lower Cahfornia. 



Remarks. — The cotypes of Hyla affinis may have been collected by 

 J. H. Clark within the present boundaries of Arizona, although they 

 are listed by Baird as coming from northern Sonora. A brief itin- 

 erary of Clark, while attached to Colonel Graham's party of the 

 United States and Mexican Boundary Survey, will be found in the 

 remarks under Bufo pundatus (p. 62). The original U.S.N. M. 

 number assigned to the cotypes of H. affinis is 3261, and somewhat 

 later this lot was reentered under 11410. There were originally four 

 specimens, but the type bottle now has one additional young specimen. 



In 1866 Cope published the results of his dissections on the 

 abdominal integuments of Amphibia and described their union with 

 the superficial fascia of the muscles by an areolar or fibrous network. 

 These closely approximated areolae, which "secrete an adhesive fluid 

 as aid in maintaining the pecuhar positions assumed," are formed by 

 a thickening of the abdominal skin, and they indicate the extent of 

 abdominal attachment. Cope lists the hylids that he studied accord- 

 ing to the extent of the dermal attachment, and in his second group 

 arenicolor is proposed as a substitute name for H. affinis, which is 

 preoccupied by a prior use of the same specific name by Spix. 



Boulenger was misled by errors in the published description of 

 Hyla affinis and concluded that a specimen of this tree frog from El 

 Paso, Tex., represented a different species, which he named Hyla copii. 

 Boulenger later insisted that "iJ. arenicolor Cope is a mere name, 

 proposed to replace that of affinis, Baird, preoccupied," and that his 

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