36 CHJ]CK LIST OF THE 



D. I., 8; A. I., 7; v., 8; P., 18. 



Colour Males in spring dusky, with black head and the snout and 

 chin with numerous coarse tubercles. Females much paler ; both sexes 

 have a dark lateral stripe which varies much in individuals. Some speci- 

 mens I have show it clear and distinct from shoulder to the end of the 

 caudal, while in others it is scarcely visible. There is a dark band along 

 the base of the dorsal, widest and most distinct in front, fading out to- 

 wards the rear. Length about two and a half inches. 



The Blackhead is found chiefly in streams and ponds having a mud 

 bottom. I have found it more frequently in Eastern Ontario than else- 

 where. It spawns in June among the stones near the shores of its habitat. 



(30) Blunt-nosed Minnow. 



(Pimephales notatus.) 



Body rather elongate, with a slender caudal peduncle ; head rather 

 long, with the snout abruptly decurved. INlouth very small, inferior, nearly 

 horizontal ; caudal moderately large and forked. The lateral line curves 

 very slightly downward as far as the ventral origin and then follows 

 straight along the median line; it is complete. Scales, 6-42 to 45-5. Teeth, 

 4-4. D. I., 8; A. I., 7; v., 8; P., 15. 



Colour, dusky olive, lighter on sides, black spot on front of the dorsal 

 (wanting in young). Head wholly black in spring males, the snout with 

 fourteen large tubercles. 



This is a larger species than the preceding, reaching a length of four 

 inches. It occurs in the St. Lawrence River and may be generally distrib- 

 uted, but so far I have not found it in Western Ontario. 



Genus SEMOTILUS. (Chubs. Fall-fishes.) 



Body stout, moderately compressed and elongate; mouth terminal, 

 wide, the upper jaw protractile ; a small barbel just above the end of the 

 maxillary ; in most American Minnows the barbel is at its tip, the maxil- 

 lary barbel sometimes absent in young; teeth 2, 5-4, 2, hooked, without 

 grinding surface; scales rather large, lateral line complete; a short intes- 

 tinal canal; dorsal placed behind ventrals ; base of anal short. Vertebrae, 

 22 + 20 = 42. 



Subgenus LEUCOSOMUS. 



(31) Chub. Horned Dace. 



(Semotilus corporalis.) 



Body moderately deep, elongate, with a stout caudal peduncle ; head 

 rather large; snout pointed; mouth oblique, jaws nearly equal, the maxilla 

 extending to below front of eye. The caudal is large and deeply forked. 

 The lateral line curves downward abruptly over the pectoral, becoming 



