"^°|,- ^^n RiDGWAY on Fishers Petrel 32 I 



piaiia GiGLioLi and Salvadori.^ The former agrees with ^. 

 Jisheri only in the pattern of coloration of the inner web of the 

 primaries, being otherwise very distinct in plumage and having 

 the bill much stouter, the tarsi and toes decidedly shorter, and 

 the wing also shorter. AL. defilippiana, although bearing a slight 

 superficial resemblance in general coloration, is even more 

 distinct, as the following comparative diagnoses, drawn up from 

 the type of ^. fisheri and two examples of yE. defilippiana, one 

 in the American Museum of Natural History, New York City, 

 the other in the collection of Canon Tristram, will show : — 



Comparative Characters of ^strelata fisheri and ^. defilip- 

 piana. 



*£. fisheri. — Lower parts chiefly smoky gravish brown on the sur- 

 face, this color nearly uniform on belly and flanks ; greater wing-coverts, 

 secondaries and tertials silvery gray, broadly edged with pure white, the 

 lesser coverts uniform dusky in strong contrast ; rectrices (except middle 

 pair) white, transversely vermiculated on both webs with ash gray ; top of 

 head white, spotted with dusky; feet, including webs, dusky, except basal 

 portion of inner web and toe. Wing, 10.15 ! t^i^' 4-°° (graduated for .90 

 of an inch) ; culmen, i.oo; tarsus, 1.35 ; middle toe with claw, 1.70. 



^E. defilippiana. — LoAver parts entirely pure white, except on sides of 

 breast, -which are ash gray, like the nape. Outer surface of wings uni- 

 form dusky; rectrices uniform ash gray, except two outer pairs, which 

 have inner webs white (the second finely sprinkled with gray towards 

 end), the outer webs finely mottled gray ; feet, including webs, pale- 

 colored (fleshy in life), except outer side of outer toe, which is dusky. 

 Wing, 8.70-9.00; tail, 3.80-4.25 (graduated for .90-1.00 inch); culmen, 

 1.04-1. 10; tarsus, 1. 07-1. 20; middle toe with claw, i. 37-1. 40. 



The two species are, in fact, very distinct. ^. defilippiana 

 is decidedly less in general size, although the bill is absolutely 

 larger than in yE. fisheri. The lower parts are entirely white, 



^ JEstrelata defilippiana GiGLiOLi & Salvadori, Ibis, V, n. s. Jan. 1869, 

 63 (off coast of Peru, lat. 18° 4' S., long. 79- 35' W.) ; Atti Soc. Ital. 

 Nat. XI, 1869, 453. — GiGLiOLi, Fauna Vertebr. nell' Oceano, 1870, 

 43. — Ridgway, Man. N. Am. B. 1887, 68. 

 CEstrclata dfilippiana Salvi.n, Rowley's Orn. Misc. I, pt. iv. May, 1876, 

 -55' Pl- 33-— RitX'WAV, I'roc. U. S. Nat. Mus. VI, 1886, 657, 658, 

 in text ; VIII, 18S5, 17, iS. 



