PROC. U.S. NAT. MUS. VOL. Ui 



ARNETT— PLATE 4 



(Top) Dt'scri hmd near .\Ia\crick, type locality of Oxyropis huzvdnn Arncti; (bottom) 

 Saiila Klcna Canyon, showing the Rio Grande River, with Mexico on the left and United 

 States on the right. The dense vegetation along the river's edge provides the breeding 

 area for Oxacis trimaculala Champion, a species usually found in more humid areas. 



