^STRELATA. 63 



Genus ^STRELATA Bonaparte. (Page 54, pi. XYL, fig. C.) 



Species. 



fl'. Inner webs of primaries wholly dusky or with not much more than basal half 

 white, 

 t'. Plumage largely or chiefly white beneath, 

 c*. Upper tail-coverts same color as back. 

 d\ Wing more than 9.00. 



e'. Tail ash-gray, the exterior feathers whitish, mottled with 

 gray ; back, scapulars, rump, etc., plain ash-gray or light 

 plumbeous ; wings much darker ; lower parts white, the 

 sides of the chest and neck waved or barred with ash- 

 gray. 

 /'. Wing 11.50-12.00, tail 5.00-5.90, culmen 1.45-1.50, tarsus 

 1.65-1.70, middle toe, with claw, 2.40-2.45; top of 

 head almost entirely white. Hab. South Pacific and 



Indian Oceans. 



JE. lessoni (Garx.). Lesson's Petrel.' 

 f\ Wing 9.50-10.50, tail 4.50, culmen 1.10, tarsus 1.33, middle 

 toe, with claw, 1.75 ; top of head deep ash-gray, except 

 anteriorly. Hab. South Pacific and Antarctic Oceans. 

 JE. mollis (Gould). Downy Petrel.^ 

 e'. Tail uniform dusky, the exterior feathers sometimes mottled 

 with whitish. 

 /'. Axillars and under wing-coverts uniform smoky gray or 

 dusky. 

 </'. Culmen 1.25, or more. 



h'. Width of upper mandible at base equal to the 

 height of the closed bill at base. 



Head, neck, and chest uniform sooty grayish 

 brown, darker above, where nearly the 

 same shade as the uniform dai-k sooty 

 color of the upper parts generally ; entire 

 sides, flanks, and outer webs of exterior 

 lower tail-coverts sooty grayish brown, 

 like under surface of wing ; rest of lower 

 parts white; wing 11.10, tail 4.70 (gradu- 

 ated for 1.40), culmen 1.28, width of bill 

 at base .65, depth .65, tarsus 1.75, middle 



' ProcelUirla letioni Gabnot, Add. Sc. Nat. vii. 1S2C, 54, fig. 4. ^Ettrclata Icioni CAS.S., Proc. Ac. X.it. 

 Sci. PhiL 1862, 327. 



» Proceltarin mollit GocLD, Ann. A Mag. N. H. xiii. 1844, 363; B. Austr. vii. pi. 50. .,E$trelata moUit 

 CocES, Proc. Ac. Nat. Sci. Phil. 1866, 150. 



