LARID^. 



Genus ANGUS IvEach. 



Plumage uniform sooty brown, becoming hoary on the forehead and top of the 

 head (larger, wing 10.30-11.00); crown and forehead lavender-grey. Summer adult: 

 Forehead nearly white at the base of bill, passing to lavender-grey, which becomes lav- 

 ender on the hind neck ; primaries and tail feathers nearly black. Adult female : Simi- 

 lar, but a trifle smaller and with a weaker bill. Young similar. Length 13.00-16.25, 

 wing 10.30-11.00, culmen i. 70-1. 75, tarsus .90-.93, tail 5.90-6.25, toe i. 52-1. 55, depth 

 of beak .40. Hab. Tropical and juxta-tropical seas, wide-ranging. Hawaiian Islands. 

 PI. XVI., 7903, 9157; XVII., 7900. 8. A. stolidus' (Linn.). Noddy. 



Genus MICROANOUS Saunders. 



Middle toe and claw shorter than the exposed culm.en; bill slender and long ; the 

 distance from the angle of the gonys to the tip of the bill greater than to that of the 

 gape ; lores deep black ; cheeks decided plumbeous ; nape, shoulders and tail, dull lav- 

 ender grey ; lower parts dark sooty brown ; forehead and crown dull greyish white in- 

 clined to a silvery white. Young: Similar but browner. Length about 13.00, wing 

 8.75-9.00, tail 5.25, tarsus .80, middle toe 1.30, culmen i. 50-1. 85 (Laysan specimen 

 with darker lores), depth of bill .32. Hab. Hawaiian Islands. 

 PI. XVII., 9164, 9165. 9. M. hawaiien'sis Roths. Hawaiian Tern, Noi'o. 



Genus GYGIS (Ji'jis) Wagi,er. 



Middle toe and claw shorter than the exposed culmen ; bill black, stout at the 

 base and sharply pointed; pure white except a narrow ring about the eye which is 

 black; toes slender, middle toe abnormally long, webs deeply excised (stouter, tail more 

 pointed); shafts usually brownish. Young like above. Length 12.00-13.00, depth 

 of bill .40, wing 9.50, tail 4.25-5.00, tarsus .45-.50, middle toe with claw i.io, culmen 

 1.80. Hab. Central Pacific generally. Laysan, etc. 

 PI. XVII., 7892. ID. G. alba kittlitz'i Hart. White Tern. 



7 A specimen of stolidus in the Museum series (Coll. No. 1309), which varies somewhat from the typical form, is minutely described by 

 Mr, Scale in his "Field Notes on the. Birds of Oahu, H. I.," Occasional Papers of the B. P. Bishop Museum, Vol. I., No. 2. p. 35. 



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