BuL. U. S. B. F., 1 90S. 



Plate CXX. 



Fig. 15.— Photograph uf dace in the act of spawning. The female is in the upright position. The male has 

 either not completed his embrace of the female or has just relaxed it. Photograph made with a reflect- 

 ing camera, the fish in an aquarium out of doors. 



Fig. 16.— Male and female of the horned dace just after completion of the spawnine;^ act. The female floats 

 bellj; up as though dead. The male appears to examine the falling eggs, vvhicli are in front of his head 

 and in front of the stones beneath him as well as in the interv'ening Clearwater. Photograph made with 

 a reflecting camera, fish in an aquarium out of doors. The vegetation shown in this and the other 

 figures was painted on the back of the aquarium. 



