440 Zoological Society :— 
racescenti-alba, abdomine flavido lavato : rostro superiore ob- 
scure corneo, inferiore rubello : pedibus nigris. 
Long. ota. alee. caude. 
Spec. a, d, 5°4 3°0 2°7 
6, 2, 5°0 2°7 2°2 
— ec, ? 60 3°1 2°8 
— d, 6:0 2°9 ye 
—- ¢, a7 2°8 ye 
— f/f, 5°8 3°0 2°8 
I 5°8 3°0 2°8 
Hab. In ins. S. Thome Antillensium. 
Mus. P.L.S. 
Obs. Affinis Elainee pagane et ejusdem formee, sed rostro lon- 
giore, compressiore, et corpore subtus pallidiore distinguenda. 
I have specimens of two species of this genus of Tyrannide in my 
collection from Jamaica. One of them is EZ. Cotte of Gosse; the 
other, as far as I know, undescribed, but quite different from the 
present. I have also an Elainea from Tobago, which I cannot refer 
strictly to any known species. 
On THE AFRICAN TRIONYCES WITH HIDDEN FEET (EMypa). 
By Dr. J. E. Gray, F.R.S., V.P.Z.S. 
Five species of my genus Hmyda (which MM. Duméril and Bibron 
afterwards most unnecessarily named Cryptopus) have been described 
as found in Africa, viz.— 
1. Cryptopus senegalensis, Dum. & Bib., from Senegal. 
2. Cyclanosteus Petersii, Gray, from the Gambia. 
3. Cyclanosteus frenatus, Peters, MSS., from Mozambique. | 
4. Cryptopus Aubryi, Duméril, from Gaboon. 
5. Aspidochelys Livingstonii, Gray, from Mozambique. 
Now it is very doubtful if several of these names are not synony- 
mous, not because there is any doubt as to the distinctness of 
species, as some neophyte belonging to the Darwinian School might | 
suspect, but simply because the materials on which they are founded 
do not afford us sufficient information or means of comparison. 
Cryptopus senegalensis was described from a very young specimen 
in the Paris Museum before it had any of the sternal callosities de- 
veloped. The specimen of Trionyx, with flaps over its feet, which 
we have received from the same locality, is unfortunately in the same 
condition ; and though it affords very good evidence that it is desti- 
tute of any bones on the margin of the shield, and therefore does not 
belong to the same genus as the Asiatic animal with which M. Du- 
méril associated it, yet it does not give us the means of knowing to 
which, if to either, of the two African forms, viz. Cyclanosteus and 
Aspidochelys, it should be referred. 
The description of Duméril, and the colouring of the head, &c. of 
the specimen in the Museum, show that it must be distinct from 
Cyclanosteus frenatus and from Cryptopus Aubryi (which may be 
