MEXICAN TAILLESS AMPHIBIANS 183 



vocal vesicle large; some vinaceous spots behind angle of 

 mouth; the fore limb being carried forward along the head, 

 the wrist reaches beyond the tip of the snout; fingers moder- 

 ately elongated — in order of increasing lengths: 1, 2, 4, and 3; 

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

 tarsal joint reaches to front of scapula or between shoulder and 

 eye; hind limb stout; toes with blunt tips and distinct subartic- 

 ular tubercles; two very prominent, oval, compressed metatarsal 

 tubercles, the inner sublongitudinal and protuberant, the 

 outer sub transverse; skin perfectly smooth or irregularly 

 roughened by tiny asperities; a dermal fold extends across 

 head behind the eyes; body length, snout to vent, 28 to 40 mm. 

 Hypopachus variolosus (p. 184) 



Toes free, without vestigial web at base; fingers free, blunt or 

 slightly dilated at tips; terminal phalanges simple; precora- 

 coids absent; coracoids united by a simple cartilage; no omo- 

 sternum; sternum cartilaginous; underparts yellowish or brown- 

 ish, stippled or marbled with brown Gastrophryne (p. 186). _2 



2. A prominent outer mietatarsal tubercle and a somewhat larger 

 oval inner metatarsal tubercle; snout acuminate, moderately 

 projecting, and not twice as long as the diameter of the eye; 

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

 tarsal joint reaches the shoulder or slightly beyond; toes quite 

 free, with blunt tips and distinct subarticular tubercles; skin 

 smooth or with small tubercles on back; a more or less dis- 

 tinct dermal fold across the head behind the eyes; upperparts 

 olive or brownish; generally a broad light band along each 

 side of the body, and a narrow vertebral line; limbs lighter in 

 color; thigh and leg each with a broad dark cross band; a 

 white line from angle of mouth to insertion of fore limb; male 

 with subgular sac; throat deep black; body length, snout to 

 vent, 26 to 28 mm Gastrophryne usta (p. 187) 



No outer metatarsal tubercle; inner metatarsal tubercle very 

 small, indistinct; snout pointed, projecting, and twice as long 

 as the diameter of the eye; the hind limb being carried for- 

 ward along the body, the tibio-tarsal joint reaches in front of 

 the shoulder; toes quite free, with blunt tips and distinct sub- 

 articular tubercles; skin perfectly smooth; a dermal fold 

 across the head behind the eyes; upperparts rose colored or 

 light brown; back with an irregular broad dark band; sides 

 of head and body dark brown; hip with a large dark-brown 

 round spot; thigh, leg, and tarsus each with a dark-edged 

 cross band; belly marbled with brown; throat brown, mar- 

 bled with white; body length, snout to vent, 32 mm 



Gastrophryne elegans (p. 187) 



Genus HYPOPACHUS Keferstein 



1867. Hypo-pachus Keferstein, Nachr. konigl. Ges. Wiss. Univ. Gottingen, 

 no. 18, p. 351, July 24. [Genotj^pe, Hypopachus seebachii Kefekstein, 

 idem, p. 352 (Costa 'R,icsL)—Engy stoma variolosum Cope, 1866, Proc. Acad. 

 Nat. Sci. Philadelphia, vol. 18, p. 131, May (Arriba, Costa Rica).] 



Three species of Hypopachus — cuneus, inguinalis, and variolosus — 

 are now recognized. The Texan species, H. cuneus, has been taken 



