LARID^. 7 



broadly and closely barred ; tail feathers umber brown with dull white tips ; bill 



brownish basally, black terminally; tarsi and toes brown; wing 15.00-16.75, depth 



of bill at the angle .60-. 75, tarsus 2.00-2.60, middle toe and claw about 2.10. Hab. 



Western North America, wintering on the Pacific coast. Hawaiian Islands (accidental; 



one specimen in St. Louis College cabinet). 



2. I/, californ'icus Lawr. California Gull. 



CC. Smaller, length 18.00-20.00; mantle lighter grey; bill with a black 

 band in adult. Adult: Bill greenish yellow, crossed near the end b}' a distinct black 

 . band ; tip sometimes orange ; feet pale yellow. Immature : Head slightly streaked; 

 mantle grey with a few brown feathers about the bend of the wing; outer primary without 

 indication of a white spot ; tail feathers white with the remains of the broad dark subter- 

 minal band. Young: Above brownish dusky varied with dull buiifish white; quills black- 

 ish, the shorter ones greyish basally with white tips; bill blackish, paler at the base; 

 wing 13.25-15.25, culmen i. 55-1. 75, depth of bill at angle .50-. 65. Hali. Whole of North 

 America. Hawaiian Islands (accidental ; one specimen in St. Louis College cabinet). 



3. Iv. delawaren'sis Ord. Ring-billed Gull, 

 aa. Head uniform black or dusky in summer adults; lower parts, rump and 

 tail pure white; mantle grey; tarsus not longer than the middle toe and claw; 

 wing more than 10.00 (culmen more than i.oo); bill reddish brown, with a darker 

 subterminal band; head and upper part of the neck plumbeous black with a conspicu- 

 ous elongated white patch both above and below the eye ; lower parts white with a rosy 

 blush in freshly killed birds; the secondaries broadly edged with white; primaries all 

 tipped with white and all bluish grey next the shafts on the tipper part, except the 

 outermost which has the outer web black and some white on the inner web, with a 

 black subterminal bar. Female similar. Adult -a'liiter: Like above with the head white, 

 spotted and mottled with l)lackish on the upper surface, fiuu/atuie: Similar, but with 

 a larger proportion of black in the primaries. Length 13.50, tail 4.25, tarsus 1.47, toe 

 with claw 1.50, culmen 1.25, depth of bill at gonvs .32, wing 11.25. flalK Interior of 

 North America from Iowa northward, breeding; south to Middle America and Western 



South America to Peru. Maui.^ 



4. I<. franklin'ii Sw. & Rich. Franklin's Gull. 



Genus STERNA Lixx/Eus. 



a. Crown black in the breeding plumage (more or less varied with white in 

 winter); wings rarelv over 12.00; both webs of the outer tail feathers white at the base. 

 b. Mantle, back of neck, rump, upper tail coverts and all the tail feathers 

 except the outer ones ( streamers ) uniform soot\- black ; forehead and superciliary stripe 

 white; supereiliary stripe not reaeliiug haek arei' the eye: under parts white with a 

 greyish tinge on the abdomen ; bill and feet black. Winter adult: Like above except 



4The above description and measurements are based on the single icinter specimen in the cabinet ot St. I.ouis Colle.i^e. Oaliu. The 

 specimen was taken bv Brother Matthias on Maui, agd is the first record of the species being taken here. 



[263] 



