No. 49S] 



Plains 



Western yellow-thoat, Geothhjpis 



Pallid horned lark. Otocoris alpes- 



Western grasshopper sparrow. Co- 



latus (Swains.). 

 Sennett nighthawk, Chordeiles vir- 

 ginianus sennetti (Cones). 



Merriam. 



391 



Prairie 



\rirhas bmchidactiiht ( Swains. ). 

 Prairie horned lark, Otocoris air 



pestris practicola Hensh. 

 Crasslmppor sparrow, Coturni- 



culus savauHantm jia+s, miKs 



(Wils.). 



Xi-hthawk. Clumhih-s rinjhiimius 



(GmeL). 

 (Shaw). 



(c) Furthermore many of the forms from the eastern 

 forest region arc hero replaced by others whose principal 

 rangeis to the westward of the prairie. The following 

 examples may be noted: 



Eastern Forest 



