48 CALIFORNIA ACADEMY OF SCIENCES. 



taken from a flock of nearly a dozen, on September IStli, 

 1886. 



64. Chelidon erythrogaster. 



Barn Swallow. — A pair came to the islands on May 21st, 

 1887, and after vainly trying to find mud for a nest, 

 departed on Jnne 2d. 



65. Lanius ludovicianus excubitorides. 



White-rumped Shrike. — One seen on the island for 

 several days in 1886. 



66. Vireo bellii pusillus. 



Least Vireo. — Two male specimens, one of which was 

 caught alive in the house on May 28th, 1887, are in Mr. 

 Emerson's collection. 



67. Mniotilta varia. 



Black and White Warbler. — A male in good plumage 

 was found on the rocks below the bell wires that lead to the 

 tower May 28th, 1887; it is now in Mr. Emerson's collection. 

 It measures, wing, 68 mm.; tail feathers, 50 mm ; bill from 

 nostril, 8.5 mm.; tarsus, 16 mm.; middle toe and claw, 

 15.5 mm. 



68. Helminthophila celata lutescens. 



LuTESCENT Warbler. — One was seen in company with 

 other small land birds on May 22d, 1887. 



69. Dendroica aestiva marcomi. 



Western Yellow Warbler. — Two seen May 22d, 1887. 



70. Dendroica cserulescens. 



Black-throated Blue Warbler. — A female of this species 

 remained in and about the house for three weeks, dying 

 November 17, 1886. It is believed to be the first occurrence 

 of this warbler in California, for it has never been observed 



