Dr. E. Coues on Central-American Laridre. 391 
that of the latter surpasses that of S. antillarum. It moreover 
has no black apex, and is basally of a greenish hue. The legs 
are of an olivaceous greenish instead of a clear yellow. The 
black hue which separates the white frontal lunula from the 
white of the cheeks is very narrow and imperfect. The propor¬ 
tions of tarsus and toe are somewhat different. Length of bill, 
from the forehead, 1*40 (English inches and hundredths); 
height at base *35. Wing, from the carpal joint, 7*00. 
If this be not the S. superciliaris , it is doubtless an undescribed 
species. 
12. Hydrochelidon fissipEs, G. It. Gray ex Linn. 
The common bird of Europe and North America. 
a. Adult <?, Southern Water Cay, British Honduras, May 
1863; and other specimens. 
13. Haliplana pan ay a auct. (nec Gmel. et Lath.). 
Mr. Salvin's specimen of Haliplana is identical with numerous 
examples in the Philadelphian Academy's Museum, from the 
Antilles and other localities, including specimens received from 
Mr. Gould, from Australia, labelled by him “ Onychoprioji 
panaya” Individuals of this widely distributed species from 
the most diverse localities are all absolutely identical. The 
form of the species agrees closely with H. fuliginosa , the type 
of the genus Haliplana or Onychoprion ; but the colours are very 
different. The bill and feet are black. The cap, nape, and a 
line from the nostrils through the eyes glossy black. Prima¬ 
ries black; their inner webs with a median longitudinal white 
space; their shafts brownish black. Entire upper parts deep 
greyish slate. Front broadly w T hite; the colour extending back¬ 
wards over the eyes as a conspicuous superciliary streak. Whole 
underparts white. Tail a lighter shade of the colour of the 
back; the more internal rectrices bordered on their inner webs 
with white; the two external rectrices on each side white, with 
only a small part of their inner webs slate-coloured, the amount 
of the slate-colour varying greatly with individuals. Mr. Salvin's 
specimen has a somewhat broader white front than any other 
examples I have seen. 
This is the species which is identified with S.panayensis, Gmel. 
