20 Direclor' s Anmial Report. 



Order LONGIPENNES.— Long-winged Swimmers. 



a'. Bill without cere, lower mandible not longer than upper, 

 tail feathers twelve, claws feeble or moderate. Family Larida", 

 Gulls and Terns. 



b'. Tail even, hind toe perfectly developed but small, cul- 

 •nien more than two-thirds as long as tarsus. Genus Lams. 

 b". Tail graduated. 



C'. Outer tail feathers broad and rounded at tip. 



d'. Wing le.ss than 9.5, general color black, 

 wings lighter. Genus Hydrochclidon . 



d'. Wings more than 9.5, general color, includ- 

 ing wings, a sooty black. Genus Anous. 



Or . Outer tail feathers sharp, pointed, the next to the 

 outer pair the longest, general color pure white. Genus Gygis, 

 Wagler. 



Genus ICARUS Lixn.^u.s. 



I. I/arus vegae (Palmen). Pallas' Gull. 



Mantle light gray or pearl gray ; no black spot on the bill of 

 the adult. lyCngth 26, wing 15. 15-18.30, culnien 1.90-2.20, tarsus 

 2.15-2.20. Hab. Pacific Ocean, probably accidental on the Mari- 

 anas, only one specimen having been taken there, which is now in 

 the Paris Museum. 



Gems HYDROCHELIDON Boie 



2. Hydrochelidon leucoptera (Temm.). White - winged 



Black Tern. 



General color black, silvery and white on wings ; young and 

 winter specimens with tail and under parts white. lyength 9.3, 

 culmen i.i, wing 8.2, tail 3.1, tarsus .75, mid-toe and claw i. 

 Hab. (Doubtful) Parts of the Australian and American coasts. 



Genus ANOUS Le.\ch. 



a'. Forehead alone is distinctly wdiitish. Anous stolidus.l^niw. 

 a,-. Entire top of head whitish, the white changing graduallx' 

 into a.shy on the hind neck. Anous Icucocapillus, Gould. 



3. Anous leucocapillus Gould. Black - cheeked Noddj^ 



Lores jet black, cheeks dusky, upper and under parts nearl\- 

 black, tarsus and toes dark brown. Length 13, culmen 2, wing 9, 

 tail 5, tarsus .9, mid-toe and claw 1.4. Hab. Inter-tropical Atlantic, 



