FISHES 83 



barbels on each side; head very slender; dorsal iin over the ventrals: 

 basin of the Arkansas; not rare. 



E. cBstivalis (Girard). Length 60 mm.; head 3.75; depth 5.3; color 

 silvery, spotted with black; scales 6-36-4; head very slender; snout pro- 

 jecting beyond the mouth: Platte River to the Rio Grande; common 

 in sandy river channels; not in small brooks. 



E. hyostomus (Gilb.). Length 60 mm.; head 4; depth 5.5; color 

 silvery speckled with black; scales 37; snout long, acute, projecting 

 beyond the mouth half its length: Indiana to Iowa; southward to the 

 Alabama River; northward to Minnesota; common in sandy river 

 channels. 



45. Macrhybopsis Cockerell & Alliston. Similar to Extrarius: 

 I pair of barbels; scales each with a longitudinal keel: i species. 



M. gelid us (Girard) . Length 50 mm. ; head 4; depth 5 ; color silvery, 

 speckled with black above; scales 6-44-4; snout very long, projecting in 

 front of the mouth; rays of anal tin 9; caudal peduncle very long and 

 slender; tail deeply forked; eastern Nebraska to Wyoming and Mon- 

 tana; locally common. 



46. Erimystax Jordan. Teeth one-rowed, 4-4; i pair of barbels; 

 scales 44 to 50 in lateral line: 2 species. 



E. dissimilis (Kirtland). Length 100 mm.; head 4.5; depth 5; 

 color olivaceous, mottled; sides with a bluish lateral band, in which is a 

 series of dusky spots; eyes very large; scales 6-40 to 47-5 ; body long and 

 slender: Lake Erie to the head waters of the Tennessee; common in the 

 river channels. 



E. watauga J. & E. Similar to H. dissimilis; scales 5-48 to 52-4: 

 Virginia to Arkansas; northward to Indiana. 



47. Erinemus Jordan. Teeth two-rowed, i, 4-4, i or o; scales 

 large, 34 to 40 in lateral line; i pair of barbels: i species. 



E. labrosus (Cope). Length 75 mm.; head 4.25; depth 4.2; color in 

 males dark steel blue with black markings, in females silvery with a 

 blue lateral streak; a large dark spot on the hinder rays of the dorsal fin; 

 a small spot at the base of the tail fin; scales 5-34 to 40-3: basin of the 

 Santee; common. 



E. hypsinotus (Cope). Length 75 mm.; head 3.75; depth 4; color 

 silvery, with a double series of black specks along the lateral line and a 

 black lateral band; males with red fins; scales 5-40-3: Santee basin; 

 rare. 



E. rubrifrons (Jordan). Length 75 mm.; head 4; depth 5; color 

 olivaceous, with a plumbeous silvery lateral band; snout in males red 



