MEXICAN TAILLESS AMPHIBIANS 109 



In response to an inquiry in regard to the type of Borborocoetes 

 mexicanus, H. W. Parker, of the British Museum of Natural History, 

 repHed as follows: 



As you suspect, this is probably an Eleutherodactylus. The terminal phalanges 

 arc T-shaped, but the digits are scarcely dilated; fingers and toes subequal dis- 

 tally. No tarsal fold seems to be present. 



After having examined the co types (B.M. Nos. 1892. 2. 8. 66-67), 

 Doctor Dunn corroborated the assumption that Borborocoetes mexi- 

 canus and Eleutherodactylus calcitrans did not represent distinct 

 species and affirmed that they were the same. The cotypes of B. 

 mexicanus were collected by Dr. A. C. Buller on the Hacienda el 

 Florencio, and according to his route map they were taken on August 

 15, 1891, at a locality nearly directly north of San Cristobal on the 

 eastern slope of Sierra de Florencio in Zacatecas. The following 

 notes were made on these cotypes : 



B.M. No. 1892. 2. 8. 66: Head-and-body length, 37.4 mm.; trans- 

 verse diameter of tympanum, 2 mm.; transverse diameter of eye, 

 4.2 mm.; anterior edge of eye to nostril, 3.8 mm.; the hind limb 

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

 between the eye and tip of snout; vomerine teeth in two small clusters, 

 each about the diameter of a choana, widely separated medially, 

 within and considerably behind level of choanae ; no tarsal fold ; inner 

 metatarsal tubercle very large, outer one quite small; large subar- 

 ticular tubercles; supernumerary tubercles on plantar surface of foot; 

 side of head black; a black band from eye to about middle of side; 

 lower hp marbled with black; upperparts light gray; upper surface 

 of thigh and tibia with dark cross bands; forearm with two dark cross 

 bands. 



B.M. No. 1892. 2. 8. 67: Head-and-body length, 28.8 mm.; a dark 

 interorbital band ; upper surface of snout light colored ; lower and upper 

 lips with light vertical bars; vomerine teeth in same position as in the 

 other cotype; other characters likewise essentially the same as in the 

 other cotype. 



Doctor Dunn, writing from London, says that Syrrhaphus omilte- 

 manus (cotypes, B.M. Nos. 1901. 12. 19. 7-8) belongs unquestionably 

 in the genus Eleutherodactylus. Dunn and Parker after examining 

 the cotypes reported that they have vomerine teeth but that they are 

 very much reduced, and that a backwardly projecting vomer is present. 

 The following notes were made on these specunens: Head-and-body 

 length of largest individual, 21.5 mm.; transverse diameter of tym- 

 panum, 2.1 mm.; transverse diameter of eye, 2.4 mm.; anterior margin 

 of eye to nostril, 2 mm.; vomerine teeth rather minute; the hind limb 

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

 to between the eye and end of snout; apical disks of fingers and toes 

 66785—32 8 



