Females (5)
--------------------------+----------+-----------------
Snout-vent (in mm.) | 20.6 | 23.6
| | (18.4-31.0)[A]
| |
Tibia/snout-vent | 0.43 | 0.43
| | (0.41-0.47)
| |
Tympanum/head width | 0.12 | 0.15
| | (0.14-0.16)
| |
Eyelid/interorbital space | 0.55 | 0.53
| | (0.49-0.56)
| |
Tympanum/eye length | 0.40 | 0.46
| | (0.42-0.50)
--------------------------+----------+-----------------

[Footnote A: Holotype is reported to be 31 mm. snout-vent length
(Gaige, 1926). The largest measured by us was 26.2 mm. snout-vent.]

The dorsal spinules are most pronounced and extensive on the
male (Fig. 1) and less so in all other specimens examined.
The illustration of the holotype suggests that it has
equally prominent, but fewer, spinules (Gaige, 1926).

The holotype, a gravid female, is the largest known specimen
(31 mm., snout-vent length). Another gravid female (AMNH
70108) has a snout-vent length of 26.2 mm.

_Distribution._--All known specimens have been found in the
foothills of the northeastern face of the Guiana Massif in
British Guiana.

FAMILY POSITION

The following characters of _Allophryne_ are those generally
held to be useful in determining family relationships:

1. Presacral vertebrae procoelus, eight in number.

2. Parahyoid absent.

3. Free ribs lacking.

4. Bidder's organ absent.

5. Intercalary cartilages present in digits; phalangeal
formulae 3-3-4-4 and 3-3-4-5-4.

6. Coccyx articulating with sacrum by two condyles.

7. Tarsal bones not fused.

8. Pectoral girdle arciferal.

9. Epicoracoidal horns present, free.

10. Terminal phalanges T-shaped.

11. Sacrum procoelus and diapophyses expanded.

12. Maxillae, premaxillae, and prevomers edentate.

13. Cranial roofing bones well ossified.

Griffiths (1959) accorded considerable taxonomic weight to the presence
or absence of epicoracoidal horns in showing relationships among the
genera placed in the Br