JULY, 1902. COLD-BLOODED VERTEBRATES FROM ONTARIO. 133 



PISCES. 



SILURID.E. 



Ameiurus nebulosus (Le Sueur). Bullhead. 



This species is common in Gull and Muskoka lakes. Very 

 little attention is given to their capture on account of the abund- 

 ance of better food fishes. 



Ameiurus melas (Rafinesque). Bullhead. 



This species is not usually distinguished from the former. It 

 is even more abundant. Gull and Muskoka lakes. 



CATOSTOMID.E. 

 Catostomus commersoni (Lace"pede). Common Sucker. 



Very abundant; the only species of sucker taken by us in 

 Ontario. One specimen taken at Chapleau has 72 scales in the 

 lateral line; head 4^; depth 4^; dorsal rays n; longest dorsal 

 ray i^ in the head. This specimen is more robust than those 

 from other localities. Hawkstone; Gravenhurst; Bala; Katrine; 

 Trout Creek; Chapleau; Lizard Islands. 



CYPRINID^E. 

 Hybognathus nuchale (Agassiz). Silvery Minnow. 



Color dark; sides with a prominent dark band, its anterior 

 portion diffuse; a dark vertebral stripe; no caudal spot; speci- 

 mens robust. Very abundant at Hawkstone; one specimen from 

 Bala. This is the most northern known range for this species. 

 Its most southern range is North Carolina and Texas. 



Chrosomus erythrogaster (Rafinesque). Red-bellied Dace. 



The average size of the specimens of this species taken in 

 Ontario is small, few specimens reaching a length of 2 inches. 

 Though taken in the spring their color was not so brilliant as 

 that of those taken in Illinois and Missouri. It inhabits clear 

 streams. Abundant where found. Hawkstone; Bala; Trout 

 Creek. 



Pimephales promelas (Rafinesque). Flat-head Minnow. 



Color very dark; common. Hawkstone; Trout Creek. 



