Dr. E. Couea on Central-American Laridse. 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. R. Gray ex Linn. 

 The common bird of Europe and North America. 



a. Adult 6, Southern Water Cay, British Honduras, May 

 1863 ; and other specimens. 



13. Haliplana panaya auct. (nee 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 " Onychoprion 

 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 white ; 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. 



