The Birds of Wyoming. 143 



river; Jesurun, Douglas; Bond, Cheyenne, and Aiken, Sher- 

 man. There are three skins in the University collection that 

 were taken at Laramie. 



622a. Lanius ludovicianus excubitorides (Swains.). 

 White-rumped Shrike. 



Summer resident, and abundant at elevations below 8,000 

 feet. Although closely related to the Northern Shrike, this 

 variety is a much smaller bird and depends to a considerable 

 extent upon insects for its food. To be sure it kills birds, but 

 not to the extent of the larger species. Just what percentage 

 of the food of the White-rumped Shrike is insects I am un- 

 able to state, but they in part, at least, make up for the dam- 

 age they do to desirable bird life by eating injurious insects. 



This variety is so common that nearly every collector in 

 Wyoming has reported it and has something to say of its 

 habits. The data is too voluminous to be included here. 



VIREOS. 



624. Vireo olivaceus (Linn.). 

 Red-eyed Vireo. 

 Possibly a summer resident ; but quite rare and largely 

 confined to eastern Wyoming. But a single record comes 

 from west of the Laramie mountains. Drexel reported this 

 species from Fort Bridger in 1858; Jesurun took one specimen 

 at Douglas on May 26, 1899; Bond took one specimen at Chey- 

 enne May 26, 1889 ; Cary reports having seen this bird at 

 Newcastle occasionally during the summer of 1900. 



627. Vireo gilvus (Vieill.). 

 Warbling Vireo. 



Summer resident and rather common. So far as known 

 this is the most common Vireo found in the state. They breed 

 in brush patches along the small streams up to 8,000 feet. 

 There are the following records for Wyoming: Drexel, Fort 

 Bridger, 1858; Coues, Green river; Bond, Cheyenne; Jesurun, 

 —(10) 



