ORNITHOLOGICAL EXPLORATIONS. 



87 



List of speeiinens collected. 



No. 89084.— Iris^dark hrown. BOl hrownish black ; more greenish gray at base of upper mandible. 

 Feet pure black. 



Ko. 89085.— Iris, dark hazel. Bill, horny gray; blackish at tip. Feet, black. 



No. 92902.— Iris, dark brown. Bill, blackish brown, lighter brownish gray at base of lower mandible ; 

 nasal shield and culmen, still lighter. Feet, black, the left tarsus with a whitish spot in front. Testes, 

 small. 



One egg was collected on May 29, 1882 (No. 1115, U. S. Nat. Mus. 

 No. 21799), and measures 57 by 41.25""'". 



26. Stercorarius longicaudus Vieill. 



\^\^.—8tercorarim\ong%caudm\YEi\A.., Nouv. Diet. d'Hist. Nat. XXXII, p. 157.— Tur- 

 ner, Auk, 1885, p. 158. 



1822.— Xesfm huffomi BoiE, Isis, 1822, p. 562.— Middend., Sibir. Reise, II, 2 (p. 241) 

 (1853).— SwiNH.. P. Z. S., 1863, p. 328.— Taczan., Bull. Soc. Zool. France, 

 1876, p. 262.— /<?., Wid., 1883, p. 341.— 7(Z., Oru. Faun. Vost. Sibir., p. 64 

 {\%n).— Stercorarius b. Dall & Bannist., Tr. Chicag. Acad., I, 1869, p. 

 304.— CouES, in Elliott's Affairs Alaska, p. 197 (1875).— Elliott, Monogr. 

 Seal Isl., p. 132 (1882).— Blakist., AmendlList B. Jap., p. 35 (1884).— Seeb., 

 Ibis, 1884, p. 176. 



1826.— /Stercorarius cepphus Steph., Gen. Zool. XII, i, p. 211.— Lestris c. Palmen, Swed. 

 Cat.Lond. Fish. Exh., p. 201 (1883), 



1828. — Lestris parasitica Lesson, Man. d'Oru., II, p. 288 (nee Lin.). — Stercorarius p. (?) 

 Blakist. & Pryer, Tr. As. Soc. Jap., X, 1882, p. 105.— Nelson, Cruise 

 Corwin, p. Ill (1883). 



The Long-tailed Jaeger in the adult plumage resembles very closely 

 the light phase of the foregoing species, but even young birds of the 

 two species may be easily distinguished. 



Some stages may at once be recognized by the coloration alone. 

 It has been given as an unfailing mark that in Eichardson's Jaeger the 

 shafts of all or most of the primaries are white, while in longicaudus only 

 the two first ones are so colored. Such is certainly the rule, but the 



