VUt BDULLELIIN Wy, UNLIBD SLALED NALIUNAL MURDU Me 
BLASIPUS HEERMANNI (Cassin). 
HEERMANN’S GULL. 
Adults in summer (sexes alike).—Head and upper neck, all round, 
immaculate white, deepening gradually into light mouse gray on lower 
neck and under parts and into grayish brown (nearly quaker drab) 
on back, scapulars, wing-coverts, tertials, and rump, the tertials 
passing into white at tips; secondaries darker grayish brown, broadly 
tipped with white; primaries dull black, the proximal ones narrowly 
tipped with white; under surface of wings uniform grayish brown, 
like upper surface; upper tail-coverts light gray; tail dull black, tipped 
with white; bill bright red, sometimes tipped with black; iris grayish 
brown or brownish gray; naked orbital ring red; legs and feet black. 
Adults in winter.—Similar to summer adults, but head and upper 
neck dusky grayish brown instead of white. 
Young.—Entirely sooty grayish brown, lighter and more grayish 
on under parts; wing-coverts, scapulars, feathers of rump, and upper 
tail-coverts margined terminally with grayish white; tail blackish 
dusky very narrowly tipped with white; bill brownish, the terminal 
third black; legs and feet brownish black. 
Immature (first winter) #—Similar to young in first plumage (as 
described above), but without pale margins to wing-coverts, etc., the 
geneal color rather darker, the tail without white tip; bill light ‘ted 
sh for basal two-thirds, the terminal portion black; legs and feet 
brownish black. 
Adult male.—Wing, 344-376 (360.4); tail, 131-154 (139.6); exposed 
culmen, 42-48 (45.7); tarsus, 48.5-54 (52.2); middle toe, 44-51 
(47.9).¢ 
Adult female.—Wing, 338-356 (346.2); tail, 132-162 (137.2); ex- 
posed culmen, 39.5-43.5 (41.7); tarsus, 47.5-51 (49); middle toe, 42.5- 
46.5 (44.9).¢ 
@ Ten specimens. An adult female from Washington (Granville, July 10), the only 
specimen examined from any locality north of San Francisco, is larger than others, 
its measurements being as follows: 
Ex- 
Locality. Wing. | Tail. Posed Tarsus. mene 
men. 
FEMALES, 
One adult female from Washington (Granville, July 10)........} 356 162 42 51 46.5 
Six adult females from California (Aptos, July)................ 343.5 | 134.5 41.9 48.6 | 45 
Two adult females from Espiritu Santos Island, Lower Cali- 
fornia: (Webruiary) iccsescesacens sinciteewesapsemeateexeeneenes 350.5 | 182.7 40. 2 49 44.2 
One adult female from Todos Santos Island, Lowor California 
Gea scan a ow areata naps im onnncumien en badaeemasaacas 342 135 43 49. 5 44 
