lo University of Michigan 



buffy brown on the back and fore limbs, deep oHve on the head, 

 and dark oHve buff on the hind limbs, with olive brown and 

 clove brown markings ; the belly whitish, the ventral spots 

 drab. 



The head is usually more olivaceous than the back, and the 

 dark spots on the hind limbs frequently have paler (citrine 

 drab in one) centers. 



Hyla helenae, new species" 



Diagnosis: Habit of Hyla alboguttata. Tongue subcircular, 

 nicked and free behind ; vomerine teeth between the choanae 

 which are large and in two oblique series forming together a 

 chevron the point of which is directed forward. Tympanum 

 distinct, one-half the diameter of the eye. Fingers with rudi- 

 ment of web, the disks nearly as large as the tympanum, no 

 projecting rudiment of pollex ; toes webbed to penultimate 

 phalange of fourth toe, disks smaller than those of fingers. 

 Head as broad as long; interorbital sj^ace broader than upper 

 eyelid; snout shorter than diameter of orbit. Skin smooth 

 above, granular below. 



Habitat: Valley of the Demerara River, British Guiana. 



Type Spcci)ncn: Cat. No. 52681, Museum of Zoology, Uni- 

 versity of Michigan; Dunoon, British Guiana; August 14, 

 1914; A. G. Ruthven, collector. 



Description of Type Specimen: (Plate I.) Head as broad 

 as long, a little more than one-third of total length. Tongue sub- 

 circular, indistinctly nicked and free behind ; vomerine teeth in 

 the form of a very open chevron. Head large, depressed, as long 

 as broad ; snout rounded, shorter than diameter of eye ; canthus 



' Named for Helen Thompson Gaige to whom I am indebted for much assist- 

 ance in the study of this collection and for the descriptions of the larvae. 



