FROGS OF SOUTHEASTERN BRAZIL — COCHRAN 305 



tarsus. Body rather slender, in postaxillary region equal to head 

 width; when hind leg is adpressed, heel reaches considerably beyond 

 tip of snout; when limbs are laid along the sides, knee and elbow 

 overlap ; when hind legs are laid at right angles to body, heels greatly 

 overlap. Skin of upper parts very finely glandular; a pair of weak 

 dorsolateral folds, and a much stronger lateral fold from posterior eye 

 to groin, enlarging posteriorly and ending as an elongate gland in 

 front of groin; a heavy gland behind the tympanum and below corner 

 of mouth; venter smooth except for some weak granules on lower 

 femur aroimd anus; a distinct ventral disk. (A slithke fold on each 

 side of throat indicates a pair of internal vocal sacs in the male.) 



Dimensions. — Head and body 45.5 mm.; head length 15 mm., width 

 14.5 mm. ; femur 23.5 mm. ; tibia 27.5 mm. ; foot 30 mm. ; hand 10.5 mm. 



Color in alcohol. — Dorsum light gray; a whitemiddorsal line and two 

 lateral lines, the dorsolateral lines being less distinct; between these 

 white lines are dark areas marked with black spots; a black stripe 

 beginning at tip of snout, continuing along canthus and through 

 eardrum to gland at comer of mouth, which is bordered below by a 

 white line and along upper lip rim by a dark brown stripe; sides of 

 body below white lateral line brown, the tubercles and glands white. 

 Gland in front of groin white. Posterior femur with a white stripe 

 bordered above and below by dark stripes, as in mystaceus; upper sur- 

 faces of legs with aggregations of black spots forming crossbars, the 

 dark blotches on top of the femur being light centered; inside of tarsus 

 and sole of foot dark brown; a short dark strip on anterior part of 

 upper arm, and a dark stripe near elbow on posterior part; forearm 

 with dark blotches. Venter pale buff, immaculate except for some 

 brown spots at comer of mouth. 



Variations. — In USNM 96731, also from Serra da Bocaina, the 

 gland at the corner of the mouth is greatly developed, being as long 

 as the snout, and looking like the flat parotoid found in some species 

 of Bufo. The inguinal gland is sometimes less distinct than in the 

 specimen described. Sometimes more longitudinal folds appear, 

 especially around the lumbar region and along each side of the vertebral 

 stripe, so that as many as five or six folds of varying lengths may be 

 counted on each side in some frogs. 



Remarks. — It is not easy to distinguish individual specimens of 

 Leptodactylus gracilis from L. sibilatrix. The length of the leg is 

 extremely variable in accepted specimens of gracilis and sibilatrix, so 

 that the heel adpressed may reach beyond the snout or only to the 

 nostril in the former, and to the tip of the snout or to the anterior 

 border of the eye in the latter. In a series, however, the average 

 length of the femur, tibia, and foot is greater in gracilis. 



The relatively slender build of gracilis seems to be a fairly constant 



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