272 ORNITHOLOGICAL EXPLORATIONS. 



their whole sojourn lasts less than three months. Mr. Joseph Lugebil 

 has kindly informed me that the swallows arrived on June 3, and dis- 

 appeared August 19. 



During the migration in spring a few stragglers sometimes pay a fly- 

 ing visit to Bering Island. Thus two were reported from the North 

 Eookery on June 19, 1883, and another was observed at Ladiginsk 

 three daj-^s later. 



A single egg left in the nest was procured in the fall. It was white, 

 heavily spotted with lilac and sepia brown, resembling those of Ch. 

 erythgastra and rustica. The dimensions are 18 by 13.5mni. 



Family MUSCICAPID^. 



123. Butalissibirica (Gmel.). 



1788.-Mu8cicapa sibirica Gmel., Syst. Nat., I, 2, p. 936.-Schrenck, Reise Amurl., I, 

 p. 377 (I860).— Radde., Reisen Siiden Ost-Sibir. (p. 271), (1863) —He'mi 

 chelidon 8. SwiNH., P. Z. S., 1863, p. 288.-Id., ibid., 1870, p. 244.-Bolau J f. 

 Oru., 1880, p. 122.- Butalis s. Swinh. P. Z. S., 1871, p. 379.-Taczan J f 

 Orn.,1872,p.446.-/d., ibid., 1875, p. 249. -M, Bull. Soc. Zool. France,'l876, 

 p. 168.— W., Orn. Fauna Vost. Sibir.,p. 31 ter. (1877).— (?) Blakist. & Pryer' 

 Ibis, 1878, p. 234.— /d.. Trans. As. Soc. Japan, X, 1882, p. 148. -Dybowski' 

 Bull. Soc. Zool., France, 1883, p. 362.-Seeb., Ibis, 1884, p. 37.-Blakist' 

 Amend. List B. Jap. p. 50 (1884). 



1826.— Muscicajm fuscedula Pall., Zoogr.Ross. As., I, p. 462.— Dybow & Parvex J 

 f. Orn., 1868, p. 333. ' * 



1853.— Muacicajya 2)ondiceriana Midd., Sibir. Reise, II, 2 (p. 188). 



1858.— Muscicapa ivfuscata Kittl. Denkw., II, p. 197 (nee Hartl.) (cf. J f. Orn 1859 

 pp. 48 and .51). ' '' ' 



1867.—Mu8cicapa linereoalba Whitely, Ibis, 1867, p. 199 (nee Temm. & Schleg.). 



The great " bird-wave » of the spring of 1883 caused one morning 

 the whole northern part of Bering Island to swarm with these inhabi- 

 tants of the mosquito-sufifering Kamtschatka. During two weeks they 

 could be met with everywhere, but especially in deep ravines or between 

 the sand dunes, in fact, in all places sheltered from the chilling " norther." 

 Always in movement, flitting from one dry stalk of the large ArcJian- 

 gelica officinalis to another, or from cluster to cluster of the yellow flow- 

 ers of the lovely Rhododendron chrysanthum, their small parties of four to 

 six individuals gave the otherwise uninviting places a new attraction. 

 Not only was their \^t, 'st, and cheerrek tek, tek! heard in the immediate 

 neighborhood of the village, but all over the northern portion. A few 

 extracts of my journal will give an idea of this phenomenon, which, dur- 

 ing the spring of 1883, made Bering Island a sort of Heligoland from an 

 oruithologcial point of view. Under June 8, 1 find : "A large number of 



