142 BULLETIN 160, UNITED STATES NATIONAL MUSEUM 



nis, but exists to a varying degree in most of the species of Phyllo- 

 medusa. In P. dacnicolor, a species allocated to Agalychnis by Cope 

 in 1866, the ability to oppose the inner digits of the fore and hind 

 feet is less marked than in some of the typical species of Phyllomedusa. 



KEY TO MEXICAN SPECIES OF PHYLLOMEDUSA 



1. A single linear series of large quadrangular black spots on sides, 



which are set off from upperparts by a continuous or inter- 

 rupted yellow border, and separated from one another by nar- 

 row oblique yellow stripes, but not extended ventrally upon 

 the belly; upperparts, upper surfaces of forearm, tibia, tarsus, 

 fifth finger, fifth toe, and narrow band on upper surface of 

 femur greenish (green or sky blue in life); humerus together 

 with concealed surfaces of limbs dark purplish; forearm, hand, 

 tarsus, and foot margined with white; toes and under surfaces 

 yellow, a deeper hue on belly; the hind limb being carried 

 forward along the body, the tibio-tarsal joint reaches beyond 

 the eyes and usually to the tip of the snout; tympanum indis- 

 tinct, subvertical in direction, ovoidal, and two-thirds diameter 

 of eye; tongue pyriform, and openly emarginate behind; 

 vomerine teeth in short series, directed inward and backward 

 from antero-internal angles of large choanae; inferior palpebra 

 with oblique subparallel white veins; fingers one-third webbed; 

 toes two-thirds webbed; digits of hands and feet furnished 

 with large adhesive disks; skin of upperparts smooth; belly 

 and underside of thighs strongly granulated; dermal folds on 

 outer margin of underside of forearm, and on inner and outer 

 margins of upperside of tibio-fibular region; head-and-body 



length, 30 to 68 mm helenae (p. 145) 



No single linear row of large quadrangular black spots; sides 



either unicolored or marbled with yellow and reddish brown 2 



2. Fingers slightly webbed at base; toes one-third webbed; adhesive 



disks of medium size; the hind limb being carried forward 

 along the body, the tibio-tarsal joint does not reach beyond 

 the eye; tympanum distinct, two-thirds the diameter of the 

 eye; tongue large, pyriform, openly emarginate behind; vo- 

 merine teeth in two short or long, transverse or oblique rows 

 between anterior margins of choanae; inferior palpebra reticu- 

 lated with white veins; skin of upperparts smooth; belly and 

 underside of thighs strongly granulated; superior surfaces 

 grass green or violet-blue (narrowly on femur), occasionally 

 with a few scattered yellow spots; gular region and posterior 

 faces of femora immaculate; forearm, hand, and foot margined 

 with white; sides marbled with yellow and reddish brown; a 

 few small pustules on anterior part of sides, which are yellow, 

 like the inferior surfaces; head-and-body length, 60 to 83 mm. 



dacnicolor (p. 1 48) 



Fingers united for one-half or two-thirds of their length by web 

 (fig. 19, a) , the membrane often extending to disks of the second 

 and fourth digits; and last phalanx of third is bordered by 

 dermal fringe; toes two-thirds to fully webbed (fig. 20, a and b), 

 the membrane often reaching to disks of all digits; tarsal fold 



