Plate 32 



Left: 'S'dUiiii threat l)lue lieroii, alxjiit halt" thrown, ])rcscii(c(l l)y the Colorado 

 Museum of Natural History. 



Right: Youiis great bhie lierou, iiiuo weeks old, Yellowstoue River, Montana, 

 presented l)v E. S. CauKM-on. Both i)rnbal)lv tnqdiizai. 



417 



