LARID^. 9 



Genus ANOXJS Leach. 



Plumage uniform sooty brown, becoming hoarj- 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. Adidt 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. stol'ldus' (Linn.). Noddy. 



Genus MICROANOUS Saunders. 



Middle toe and claic s/iorter t/ian the exposed eitlmen; 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 aljout 13.00, wing 

 8.75-9.00, tail 5.25, tarsus .So, 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 abnormall}' long, webs deeply excised ( stouter, tail more 

 pointed); shafts usuall}' brownish. You)ig 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. 10. G. alba kittliU'i Hart. White Tern. 



? A specimen of stulidni in the Museum series (Coll. No. 1309), which varies somewhat from the typical form, is minutely de.'^cribed by 

 Mr. Scale in his "Field Notes on the Birds of Oahu, H. I.," Occasional Papers 0/ the B. /*. Bishop Museum, Vol. I., No. 2. p. 35. 



[265] 



