82 BULLETIN 160, UNITED STATES NATIONAL MUSEUM 



the water's edge. No observations on the breeding habits of Lepto- 

 dadylus in Mexico have been published, but it is quite probable that 

 the breeding habits of L. albilabris in southern Mexico agree with 

 those of their West Indian relatives. Doctor Stejneger has reported 

 the finding of a remarkable foamy *'nest" of L. albilabris, "with 

 numerous small black larvae just hatched," on April 7 in a small 

 stream near Utuado, Porto Rico. 



KEY TO MEXICAN SPECIES OF LEPTODACTYLUS 



1. A white stripe on upper lip, most conspicuous in front of eye, 

 commencing on snout and extending backward to insertion 

 of fore limb, and touching inferior margin of eye and tym- 

 panum; a dark stripe running backward along canthus 

 rostralis from tip of snout to eye and from eye to above 

 tympanum and then downward to above insertion of fore 

 limb; upperparts clay-colored, reddish brown, or a pale orange- 

 brown with four longitudinal rows of more or less irregularly 

 placed dark brown or black spots; a W-shaped mark extending 

 laterally upon upper eyelids in posterior interorbital region; 

 underparts white; distal phalanges of fingers without distinct 

 dilations or disks; first finger longer than second; fingers not 

 webbed at base; two palmar callosities; subarticular tubercles 

 continued backward on palmar surface; toes in order of 

 decreasing length, 4, 3, 5, 2, and 1, with vestigial well at base; 

 subarticular tubercles continued backward on plantar sur- 

 face; two metatarsal tubercles, the inner connected with a 

 slight but distinct tarsal fold; the hind limb being carried 

 forward along the body, the tibio-tarsal joint reaches at most 

 to anterior margin of eye; vomerine teeth in two transverse 

 slightly curved series behind and generally within the level 

 of inner margins of the choanae; tongue large, ovoidal, and 

 slightly notched behind; canthus rostralis rounded; loreal 

 region oblique; snout pointed and projecting beyond upper 

 lip; interorbital space equals width of upper eyelid; tympanum 

 generally about two-thirds and always more than one-half 

 the diameter of the eye, overhung by a dermal fold; skin of 

 upperparts smooth; numerous small pointed tubercles on 

 outer surface of tibia; a narrow interrupted dorso-lateral 

 dermal fold and another similar one, though less pronounced, 

 on side from shoulder to groin; abdominal disk distinct; 

 ventral surfaces of thighs granulated; head-and-body length, 



33 to 36 mm albilabris (p. 83> 



No white stripe on upper lip anterior to eye; adults with short 

 white line below eye and often with short posteriorly directed 

 oblique continuation of the same; coloration of upperparts 

 dark brown or brownish orange, with as many as four longi- 

 tudinal rows of elongate black spots; a black, light-margined, 

 "butterfly-shaped" mark extending laterally upon upper 

 eyelids in posterior interorbital region; hind limbs distinctly 

 cross banded with a darker color; fore limbs with dark spots; 

 a dark stripe extending from nostril backward along canthus 

 rostralis to eye and from eye to above tympanum and then 

 downward; sides, throat, belly, and under surface of hind 



