42 ARKIV FÖR ZOOLOGI. BAND 13. N:0 4. 



Miguel the females also differ from those of true intermedia. 

 As I have no females in the present collection, I can only judge 

 by statements made in litterature, but judging by the entire 

 resemblance between the bird faunas of the two islands as 

 shown in this paper, I think there are no racial differences 

 between M. grisea from these islands, and therfore I follow the 

 arrangement of the quoted authors by referring the present 

 specimen to Bångs' alticincta, about the subspecific distinctness 

 of which I must confess, however, that I have some doubt. 



67. Cercomacra nigricans (Sclater). 



Cercomacra maculicaudis Bångs, Auk. XVIII. 1901. 30 (San Miguel). 

 Cercomacra nigricans Thayer and Bångs, Bull. Mus. Comp. Zoöl. XLVI. 



1905. 150 (San Miguel) — Ridgway, Birds North Middle Ani. V. 1911. 91 



(San Miguel). 



BovALLius' Collection: 1 c^, 1 $, Viveros, April 5 and 8. 



Fam. Tiirdidae. 

 *68. Hylocichla ustulata swaiiisonii (Cabanis). 



Hylocichla sivainsoni Thayer and Bångs, Bull. Mus. Comp. Zoöl. XLVI. 

 1907. 154 (Saboga, April 8 and 11). 



The Olive-backed Thrush was not collected by Dr. Bo- 



VALLIUS. 



Winter range: Southern Mexico to Peru, Bolivia, 

 Brazil, and Argentina. 



Fam. Troglodytidae. 

 69. Troglodytes musculus inquietus (Baird). 



Troglodytes musculus inquietus Thayer and Bångs, Bull. Mus. Comp. Zoöl. 

 XLVI. 1905. 154 (San Miguel). 



BovALLius' Collection: 1 S, Trapiche, April 24. 



The Panama House Wren was recorded by Thayer and 

 Bångs from San Miguel, but as only a single specimen was 

 obtained and no others were seen in the Pearl Islands, these 

 authors suppose, that the specimen in question might have 

 come to San Miguel by some accident. This second finding 

 of the bird in the Las Perlas ArchijDelago seems to favour the 

 belief that it really inhabits the Archipelago. 



