286 BATRACHIA SALIENTIA. 
This genus comprises dwarf species of Hyla, in which the vomerine teeth have 
disappeared ; its separation from Hyla is merely artificial, and not more justified than 
that of Izalus from Polypedates, or of Liohyla from Hylodes. The species composing 
it also belong to similarly divergent types; and of the following Central-American 
forms, Hylella fleischmanni and Hylella picta are more nearly allied respectively to 
Hyla prosoblepon and Hyla eximia than they are to each other. That vomerine teeth 
may abnormally be absent in some species of Hyla and Agalychnis has been mentioned 
elsewhere. On the other hand, I think that species in which the tympanum with the 
tympanic cavity has been lost should be kept separate (Cophomantis, Peters). 
1. Hylella sumichrasti. 
Exerodonta sumichrasti, Brocchi, Bull. Soc. Philom. (7) iii. p. 20 (1879) ; Miss. Sc. Mex., Batr. 
p. 48, t. 15. fig. 2. 
Hylella platycephula, Cope, Am. Phil. Soc. xviii. p. 267 (1879). 
Hylella sumichrasti, Bouleng. Ann. & Mag. N. H. 1891, viii. p. 456. 
Hab. Mexico, Santa Efigenia and Tapana (Swmichrast). 
Head short, broad, and flat; snout short, with distinct convergent canthi; tympanum 
distinct, its diameter about one-fourth of that of the eye. Fingers with a very short 
web; toes two-thirds webbed. When carried forwards, the heel reaches the eye. 
Upper parts smooth, lower areolate. Light ash-coloured above, yellowish below. 
Width of head. . 2. . . . 2... ee sod Xmillim. 
Lengthofbody . . ....... . 88, 
- hindlimb. . . . .. . 45, 
- hind foot. . . . .. . 0... 9 
39 
2. Hylella picta, sp.n. (Tab. LX XIII. fig. C.) 
Hab. Mexico, Jalapa (Trujillo). 
Head moderately broad, not depressed ; snout moderately long, rather pointed, with 
subvertical sides, and with angular straight canthi convergent into a point, forming .an 
acute angle; distance between the nostrils much less than the diameter of the eye, 
which equals its distance from the nostril; interorbital space not much broader than 
upper eyelid. Tympanum distinct, about one-fifth the area of the eye. Fingers with 
a rudimentary basal web, toes three-fourths webbed; no tarsal fold. Disks as large as, 
or larger than, tympanum. When carried forwards, the heel reaches the end of the 
snout. Upper parts smooth, lower granular. Back light purplish, with scattered, 
round, dark purple, lighter-edged spots of the size of the tympanum; on each side 
of the back a whitish line running along the canthus rostralis, above the tympanum, 
and becoming fainter in the groin; sides below this line darker than back; lower 
parts whitish ; limbs mottled, concealed parts pigmentless. 
