1919] 



'PlcUh: Larvce of Phormia 



375 



TABLE II. 



Species of Bird 



Larvae in Each 



Nest 



Totals 



Larvae 

 per Nest 



Nuttall Sparrow {Zonotrichia leuco- 

 phrys nuttaUi Ridgway) 



Rusty Song Sparrow (Melospisa tne- 

 lodia morphna Oberholsder) 



Cliff Swallow {Petrochelidon albifrons 

 Say) 



Oregon Towhee {Pipilo maculalus 

 Bell) 



Willow Goldfinch {Astragalinus tris- 

 tis salicamans (Grinnell) 



Yellow Warbler (Dendroica aesliva 

 (Gmelin) 



Western Robin {Merula propinqua 

 (Ridgway) 



Russet-backed Thrush (Hylocichla us- 

 tulata Nuttall) 



Cedar Waxwing {Ampelis cedrorum 

 (Vieillot) 



Totals 



39, 40,87. 



52,55. 



47 



45. 



28, 59. 



39. 



7, 11, 15, 16, 18, 18, 21, 

 23, 26, 27, 27, 29, 37, 

 39, 40, 43, 72, 138. . . 



22, 27, 28, 31. 



166 



107 



47 



45 



87 



39 



607 



108 



1208 



55 



53 



47 



45 



43 



39 



33 



27 



36 

 Average 



All of these nests, excepting eight, were located in shrubs 

 and trees three to twenty feet above ground, while the remaining 

 eight came from an altitude of about forty feet. Seven of the 

 latter (the Cliff Swallow nests) were taken from below the eaves 

 of a two story building on the campus of the University of 

 Washington, and the remaining one (that of the English 

 Sparrow) from a box near the top of a high telephone pole. 

 The comparatively sm.all percentage of infestation of these 

 eight nests might of course be a coincident, but it is perhaps 

 more probable that it was due to the location and structure 

 of the nests. 



The thirty-three nests infested by the larvae of Phormia 

 azurea Fallen contained 111 nestlings. Although many of the 

 larvae taken from these nests were gorged with blood, only two 



