88 VERTEBRATE ANIMALS OF THE UNITED STATES 



Key to the Species of Hybopsis 



ai Species of very small size — under loo mm. long, 

 bi Teeth i-rowed, being 4-4. 



Ci Barbels 4 H. krtranemus. 



C2 Barbels 2. 



di Lateral area without a series of dark spots; snout 

 projecting, 

 ei Scales 35 to 44. 



fi Back speckled with black spots. 



gi Lower lobe of tail fin pale in color. 



hi From the Arkansas to the Rio Grande.//. «5//i'(2/«. 

 ho In the north-central and southeastern 



States H. kyostomus. 



gi Lower lobe of tail fin black H. geldius. 



{•I Back not speckled. 



gi Lower lobe of tail fin black H. meeki. 



g2 Lower lobe of tail fin pale H. montanus. 



e2 Scales 56 H. monaais. 



d2 Lateral area with a series of round dark spots con- 

 nected by a lateral band. 



ei Scales about .44 H. dissimilis. 



€2 Scales about 50 H. watauga. 



b2 Teeth 2-rowed, being 1,4-4, i or o. 



Ci Large dark spot on hinder rays of dorsal fin H. labrosus. 



C2 No such spot present. 



di In South CaroHna H. hypsinottis. 



d2 In Georgia H. rubrifrons. 



da In the central States H. amblops. 



a2 Species of larger size — over 200 mm. long. 



bi No red on body H storerianus. 



hi Fins pale orange H. kentuckiensis . 



H. tetranemus Gilbert. Length 50 mm.; head 4; depth 5.3; color 

 silvery, spotted with black; lateral line with 36 to 38 scales; 2 long 

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

 basin of the Arkansas; not rare. 



H. cestivalis (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: Arkansas River to the Rio Grande; common 

 in sandy river channels; not in small brooks. 



H. 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. 



