168 BULLETIN 160, UNITED STATES NATIONAL MUSEUM 



Hyla eximia — Continued 



Cotypes of Hyla euphorbiacea. 



HYLA GRACILIPES Cope 



1865. Hyla gracilipes Cope, Proc. Acad. Nat. Sci. Philadelphia, vol. 17, p. 194, Oct. 

 1929. Hyla lafrentzi Mertens and Wolterstorff, Zool. Anz., vol. 84, pts. 9, 

 10, p. 235 (Desierto de los Leones, Federal District, Mexico). 



Type locality. — Mirador, State of Vera Cruz, Mexico. 



Range.— From southern Arizona southward through Chihuahua 

 (Meadow Valley) to Vera Cruz (Mirador) and Federal District 

 (Santa Rosa and Cuajimalpa). 



Remarks. —This tree frog is a southern representative of the Hyla 

 regilla group and is rather closely related to //. eximia. As a general 

 rule the dark markings on the upperparts tend to be restricted to 

 distinct spots on the hinder half of the body, and the hind limb being 

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

 beyond tip of snout. In the northern part of its range there is a 

 tendency for this frog to have longer legs, brighter colors, and less 

 webbing than those from southern Mexico. Cope seemingly based 

 his new species gracilipes on four specimens (U.S.N.M. Nos. 15318- 

 21) and one of these (No. 15321) corresponds sufficiently with the 

 original description to be designated as the electotype. The body 

 measurements for these four specimens are, respectively, as follows: 

 Head-and-body length, 28.6, 29.3, 27.5, and 35.3 mm.; transverse 

 diameter of tympanum, 1.6, 1.6, 1.2, and 1.9 mm.; transverse diameter 

 of eye, 3.1, 2.8, 2.8, and 3.7 mm.; anterior edge of eye to nostril, 2.3, 

 2.4, 2.4, and 2.7 mm.; width of head at level of posterior angles of 

 jaws, 9.4, 8.5, 8.6, and 10.4 mm. 



Mertens and Wolterstorff have recently renamed this frog Hyla 

 lajrentzi and, although comparisons are made with H. bocourti and 

 H. eximia, the species is considered to be more closely related to the 

 H. arborea group. The type of this species (Magdebarger Museums 

 fiir Natur und Heimatkunde und des Senckenberg-Museums in 

 Frankfurt a. M., No. 49/27) was collected in a mountain forest at 

 3,000 meters altitude in a region known as "Desierto de los Leones" 

 not far from the City of Mexico in Federal District. The following 

 diagnosis is abridged from the description of the type of H. lafrentzi 

 and six paratypes from the same locality : Vomerine teeth in two short, 



