MEXICAN TAILLESS AMPHIBIANS 



181 



A notation on the label accompanying the small series in the United 

 States National Museum indicates that Doctor Townsend found this 

 tree frog on vegetation in the woods near Frontera in Tabasco. 



Specimens examined. — Nine, as follows: 



Hylella picta 



"Type. 



HYLELLA SUMICHRASTI (Brocchi) 



1879. Exerodonta sumichrasti Brocchi, Bull. Soc. Philom. Paris, ser. 7, vol. 3, 

 no. 1, p. 20. — Beocchi, 1882, Mission scientifique au Mexique et dans I'Amer- 

 ique Centrale, recherches zoologiques, pt. 3, sect. 2, p. 48, pi. 15, figs. 2, 

 2a-d. 



1879. Hylella platycephala Cope, Proc. Amer. Philos. Soc, vol. 18, no. 104, p. 267, 

 June 20 (Tehuantepec, Mexico). 



Type locality. — Santa Efigenia, southeastern Tehuantepec, State of 

 Oaxaca, Mexico. 



Range. — Unknown; occurs on the Pacific drainage of the Isthmus 

 of Tehuantepec and in the vicinity of Cualata, Colima. 



Remarks. — In writing to Baird in regard to one of his shipments of 

 specimens from Tehuantepec, Sumichrast stated that his lot No. 10, 

 the cotypes of Hylella platycephala, were collected in oak woods at an 

 elevation of 2,000 to 3,000 feet. About the same time another smaU 

 series of these toothless tree frogs were forwarded to the Paris Museum, 

 and they formed the basis for Exerodonta sumichrasti. The name pro- 

 posed by Brocchi seems to have priority over that proposed by Cope. 



The type of Exerodonta sumichrasti Brocchi seems to be lost, and no 

 entry that corresponds with the locality data pubhshed by Brocchi 

 was found in the catalogues of the Paris Museum. Furthermore, the 

 following footnote in pencil and in the handwriting of Mocquard 

 appears on page 48 of the copy of Brocchi's memoir belonging to the 

 laboratory of herpetology: "Ne se trouv^ pas dans la collection du 

 Museum." 



The five cotypes (U.S.N.Jvf. No. 10037) of Hylella platycephala 

 Cope differ very slightly from one another. The following notes were 

 made on the largest individual: Head-and-body length, 31.7 mm.; 

 transverse diameter of tympanum, 1.3 mm.; transverse diameter of 

 eye, 3.7 mm.; anterior edge of eye to nostril, 3 mm.; head flat and thin 

 through; a distinct tarsal fold from inner metatarsal tubercle to heel; 

 the hind limb being carried forward along the body, the tibio-tarsal 

 joint reaches to posterior margin of eye; fingers one-third webbed at 



