1869. ] SURGEON F. DAY ON THE FISHES OF ORISSA. 369 
centricus; but, as we have already stated, we believe that this bird 
should be referred to the Brazilian species which we have termed 
M. leucauchen. The younger specimens, called M. gilvicollis by 
Herr v. Pelzeln, in spite of the number of tail-bands, we consider 
referable to the present bird, which he calls M. concentricus. 
One of the main points which Herr v. Pelzeln urges as distinguish- 
ing his M. gilvicollis from his M. concentricus is that the former has 
in every age and sex, besides the termination, three white tail-bands, 
whereas the latter has usually only one, but sometimes two. But 
we do not consider this character altogether to be relied upon, it 
being notoriously variable in other species of Accipitres. When it 
is discarded there is, as far as we can see, nothing to prevent us 
associating the two immature female birds from the Amazonian 
district, which Herr v. Pelzeln refers to M. gilvicollis (as dis- 
tinguished from M. concentricus), with the present species. 
We may also urge that this interpretation is more consonant with 
the phenomena of geographical distribution, it being primd facie un- 
likely that two so closely allied species should be found maintaining 
their distinctive characters in the same area. 
All the specimens of the present species which have come before 
us with ascertained localities have been either from Guiana or from 
some part of Amazonia, which we regard as belonging to the same 
fauna. Natterer’s specimens were collected at Para and upon the 
Rio Negro. Other specimens we have seen are from Cayenne and 
the Lower Amazon. Tschudi’s Peruvian specimens have no doubt 
been correctly referred by Cabanis to the present bird; but we have 
not yet had an opportunity of ascertaining to which species 
D’Orbigny’s Bolivian examples belong. 
3. On the Fishes of Orissa. 
By Surgeon Francis Day, F.Z.S., F.L.S.—Part II.* 
Amongst the Siluroids, I captured one small specimen of a Hara 
in Orissa, which I left undescribed; I have since taken many more, 
and compared them with those in the Caleutta Museum. It is the 
78. Hara sucuanantl, Blyth. 
Dea. Pb. a. V. 6, A. oC. 15. 
Length of head 4, of caudal 1 of the total length. The bases of the 
first dorsal and anal fins are of the same length, and equal the dis- 
tance from the posterior margin of the orbit to the end of the snout. 
The length of the base of the adipose dorsal is only equal to one-half 
of that of the anal. Height of body equals the length of the head ; 
the width of the head opposite the opercles equals 14 its length. 
Eyes small, situated in the posterior half of the head. 
Gill-openings narrow, the skin confluent with that of the isthmus. 
* See P. Z. S. 1869, p. 292. 
