ENGYSTOMATID.2. 147 
attached by two condyles, except in the genus Breviceps, where it is 
confluent with the sacrum. 
None of the genera have a fronto-parietal fontanelle. 
The distal phalanges may be simple or T-shaped. 
This family includes terrestrial, aquatic, and burrowing types, but 
no arboreal—Callula, Brachymerus, and others, generally regarded 
as “ tree-frogs,” being merely aquatic or terrestrial, in spite of their 
digital dilatations. 
For the purpose of burrowing, either the hind pair of limbs 
(Hypopachus, Glyphoglossus, Cacopus, Breviceps, &e.), or the front 
pair (/emisus), are particularly strengthened and provided with 
corneous sheaths. 
In the last-named genera the mouth is very narrow, and those 
Frogs may be considered “ ant-eaters,’ similarly as the Bufonid 
genus Rhinophrynus. 
In more than half of the genera the pupil is erect. 
Synopsis of the Genera. 
I. Precoracoids present ; coracoids moderate, horizontal. 
Pupil horizontal ; tongue subtriangular ; a cartilaginous omosternum. 
1. Rhinoderma, p. 148. >’ 
Pupil horizontal ; tongue elliptical ; no omosternum ; palate without 
TICLE Se ae nar Pan ee ede 2. Phryniscus, p. 149. © 
Pupil horizontal ; tongue elliptical ; a dorsal bony shield. 
3. Brachycephalus, p. 156. 
Pupil erect ; tongue elliptical ; palate without ridges. 
4, Melanobatrachus, p. 156. | 
Pupil horizontal; tongue heart-shaped. 
5. Sphenophryne, p. 157. 
Pupil horizontal; tongue elliptical; a denticulated dermal ridge 
across the palate between the choane, and another in front of the 
(RPGS 8. aso rt) ais coe oe 6. Calophrynus, p. 157. 
Pupil round; tongue large; toes free; anterior portion of the 
Solerotica ossified ............:. 7. Stereocyclops, p. 158. 
Pupil erect; tongue elliptical; a dermal ridge across the palate 
between the choanz, and another in front of the cesophagus ; toes 
webbed at the base ............ 8. Hypopachus, p. 159. ° 
II. No precoracoids. 
Pupil erect ; tongue elliptical ; tympanum hidden; toes free. _ 
9. Engystoma, p. 160, °"' 
Pupil erect ; tongue elliptical; tympanum hidden ; toes more or less 
UNAM Twos te crests ar at's © han 10. Microhyla, p. 163. ° 
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