ORNITHOLOGICAL EXPLORATIONS^. 



27;^ 



gray Fly-catcbers must havo arrivod yesterday or last night, as six speci- 

 ineus were shot to-day and at least ten or twelve observed. Yesterday 

 the wind was south, changing during the night to east, variable in force 

 from very light to fresh." The following day I saw at least nipe and 

 shot five. The 10th two were shot and several seen. Counted more 

 than twenty on the 11th ; shot but four. And thus some were observed 

 almost every day until the 21st, when the last was seen and shot. It 

 may be, however, that several lingered around the shores of the island 

 for a still longer time, as a few day* afterward I left Bering Island in 

 order to visit Copper Island. 



List of specimenn collected. 



Locality. 



Bering Island June 8,1883 



do June 8,1883 



do June 9,1883 



do ! June 10, 1883 



do June 11, 1883 



do June 12, 1883 



^8, 1883 

 8, 1883 

 8, 1883 

 8, 1883 j 

 9, 1883 ' 



.do - . June 



.do June 



, .do June 



. . do June 



.do June 



.do June 10, 1883 



.do June 7,1883 



Average measurements of six males 



Average measurements of seven females 



cT ad. 



d ad. 



rf ad. 



d ail. 



cT ad. 



cf ad. 



? ad. 



140 

 138 

 133 

 138 

 137 

 141 

 131 

 137 

 135 

 136 

 136 

 133 

 133 



mm. 

 17 

 17 

 18 

 17 

 20 

 21 

 15 

 20 

 17 

 19 

 21 

 16 

 16 



m,in. inm,. 



85 .55 



138 

 134 



jNo. 92543. — Tris dark brown. Bill horny brownish black, below at base yellowish gray; angle of 

 mouth yellow. Feet dark grayish brown ; toes below yellow. Testes large, swollen. 

 Xo. 92545. — Colors similar. Testes large, swollen. 

 ITo. 92541.— Ova small, not swollen. 

 JTo. 92535.— Eggs small. 



From the table above it will be seen that the difference in size be- 

 tween the two sexes amounts almost to nothing. The difference in color 

 is also very inconspicuous, the females, on the average, being a shade 

 darker than the males. 



124. Erythrosterna albicilla (Pall. ). 

 1826. — Muscicapa albicilla Pall., Zoogr. Ross. As., I, p. 462, tl). — Evfithronterna alhicilla 

 SwiNH., P. Z. S., 1862, p.317.— M. ?7;?U, 1871, p. 380.— David & Oust.. Ois. 

 Chiue (p. 120, pi. 79) (1877). 



15861 Bull. 29 18 



