Genus LARUS

Characters of the subfamily. Tail of moderate length, square at the end. Wing long, 1st primary longest.

This genus is cosmopolitan or nearly so, but a majority of the 44 species (several of which are geographical races or subspecies) enumerated in Mr. Howard Saunders's British Museum Catalogue inhabit the temperate regions of the Northern or Southern Hemi¬sphere. Seven species have been recorded on Indian coasts and rivers, but whilst all of these occur to the westward in Sind, only four have been observed in the Bay of Bengal and but two in Ceylon.

Key to the Species.

a. A black or dark brown head in summer, traces of which usually remain in winter.
a1. Mantle pale grey in adults.
a2. Size large ; wing 19…………………L. ichthyaetus, p. 299.
b2. Size moderate.
a3. Wing 11.75; first quill white in adults, with black edges and tip…………………L. ridibundus, p. 300.
b2. Wing 13; first quill in adults black, with, a white subterminal band…………………L. brunneicephalus, [p. 301.
b1. Mantle dark brown at all ages…………………L. hemprichii, p. 302.
b. No black or brown head; mantle grey.
c1. Wing 12; bill and legs red…………………L. gelastes, p. 303.
d1. Wing 18; bill yellow in adults, legs yellowish.
c2. Mantle dark slaty grey…………………L. affinis, p. 304.
d2. Mantle light bluish grey…………………L. cachinnans, p. 305.
This key applies to adults, young birds are difficult to diagnose except by dimensions.

BookTitle: 
The Fauna Of British India, Including Ceylon And Burma-birds
Reference: 
Blanford, William Thomas, ed. The Fauna of British India: Including Ceylon and Burma. Vol. 4. 1898.
Title in Book: 
Genus LARUS
Book Author: 
William Thomas Blanford
Year: 
1898
Page No: 
298
M_ID: 
4510
M_SN: 
Ichthyaetus
Volume: 
Vol. 4
Term name: 
id: 
2150

Add new comment

CAPTCHA
This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.
Image CAPTCHA
Enter the characters shown in the image.
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith