FISH OF ONTARIO. 31 



short ; ventrals short, midway between tip of snout and base of caudal ; 

 caudal fin moderately forked, the lobes equal ; air bladder with two cham- 

 bers. Head in males tuberculate in spring. 



(22) Striped Sucker. 



(Minytrema melanops.) 



Body oblong, subterete ; head moderate, subconical ; eye small ; nos- 

 trils about over the angle of the mouth ; dorsal origin over tip of pectoral ; 

 ventrals nearly under middle of dorsal. Scales large, firm, 46-13. 



D., 12; A., 7; V., 9. 



Colour dusky above, coppery below, usually a dusky blotch behind 

 dorsal fin ; scales mostly with a dark spot at the base, the spots forming 

 longitudinal stripes. In the young there is no lateral line, but in adults it 

 is almost entire. Old males during the spawning season in the spring 

 have the head tuberculate. 



This species is found in Lake Erie and probably occurs sparingly in 

 Lake Ontario also, but I have no records from that region. As a food 

 fish it is of little value. 



GENUS MOXOSTOMA. (MULLETS ; RED-HORSE SUCKERS.) 



Body moderately elongate, sometimes nearly round, usually com- 

 pressed ; scales large, nearly uniform in size ; lateral line complete, straight 

 or anteriorly curved ; head varying in length, subconical ; eye usually 

 rather large, placed moderately high; suborbital bones very narrow; fon- 

 tanelle well developed; mouth varying much in size, inferior, the mandible 

 horizontal or nearly so; lips unusually well developed, the form of the 

 lower varying, usually with a slight median fissure, but never deeply 

 incised ; lips with transverse folds, which are rarely broken up to form 

 papillae ; jaws without cartilaginous sheath ; muciferous system well 

 developed; opercular bones moderately developed, nearly smooth; isthmus 

 broad; gill rakers weak, moderately long; pharyngeal bones rather weak, 

 the teeth rather coarser than in Erimyzon and Catostomus, strongly com- 

 pressed, the lower five or six stronger than the others, which rapidly 

 diminish in size upward, each with a prominent internal cusp ; dorsal fin 

 nearly median, moderately long ; anal fin short and high, with seven 

 developed rays ; caudal fin deeply forked ; air bladder with three chambers. 



(23) White-nosed Sucker. 



(Moxostoma anisurum.) 



Body elongate, somewhat compressed, slightly arched anteriorly. 

 Head moderate, flat and broad above. Mouth slightly inferior; upper lip 

 thin, lower strongly V-shaped; eye large. Snout rather blunt, not pro- 

 jecting much beyond the mouth ; fins all well developed, the dorsal large, 

 its first ray is as long as the base of the fin ; upper caudal lobe narrow 

 and longer than the lower. Scales, 5 to 6 ; 43 to 46 ; 4 to 5. 



