166 UNIVERSITY OF COLORADO STUDIES 
Famity Cyprinide (The Carp Family) 
The following table separates the genera found in Boulder County, Colorado. 
Air-bladder surrounded by many convolutions of the very long alimentary canal; _peri- 
toneum black; herbivorous. Sexual differences very great, the males covered with 
large tubercles inthe spring <) a.))c9) 4h --! + os Campostoma. 
Air-bladder above the alimentary canal, asisnormal . . . . . . . TF. 
1. Intestinal canal elongate, usually over twice length of body; peritoneum usually 
DOLEGIES Wi pecittal Nc caP vey Nas chk boy ste hy MIM eS Bee: tara) oo ett Se mycin 2. 
Intestinal canal short, less than twice length of body nln ey a ae be Me tell 
2. Dorsal fin inserted posteriorly; scales minute. . . . . . . « Chrosomus. 
Morsalidininearly media yoo teal act ice yf ke lot) aiy [sel Mls ena yy Aetna 
3. First (rudimentary) ray of dorsal slender, firmly attached to the first developed ray 
AS IS OEM AL.) ioe ae ni emvaln Meu Ges ae pe Mtod Walls Yeo) 9 ceNiat fata le eet Hybognathus. 
Fic. 3.—Leuciscus evermanni, reproduced from the original illustration with permission 
of the Bureau of Fisheries. 
First (rudimentary) ray of dorsal somewhat enlarged and blunt, connected by mem- 
brane with ‘first developed ray 0.) 2k Pane phates. 
Teeth in the main row 5-5o0r4-5 . . . ilies tet hike 5. 
Teeth in the main row 4-4, the lesser row often absent . . . . . 6. 
Maxillary with a, minute barbel yo fac Ny heii ey). sail ed Oh leat exe a 
Maxillary without barbel; teeth strongly hooked 2a UNE A et | eA Ne ERS a 
Mazilary qwatmout barbels ya) uh cu) Sit, st ce oii he hate bats Wali cte UUa S iie 
Maxillary wrth s.aeoall barbed a)! net Ne hiie Moa Vibe pote Meu cali baea aes wn eee 
Lower jaw with the lip thin or obsolete; scales large. . . . . . Notropis. 
Lower jaw with the lip developed as a fleshy lobe on each side . . . Phenacobius. 
Premaxillaries not protractile; scalessmall. . . . . . . . «. Rhinichthys. 
Premaxillaries protractile VEN farce IM MameLbUCU DRA mere tence) 
Teeth 4-4, or 1, 4-4, I, or o, the lesser row with never more than one Hybopsis. 
Teeth usually 2, 4-4, 2, the lesser row rarely with lessthantwo . . Couesius. 
The following table for the species is based on the fins and scales: 
Dorsal with spine; DI. 7, A 7; scales 7-43 to 47-6 . . . Pimephales promelas. 
Worsal without Spine} ie) [el |i yea rao tice Nie) eth Vics) | Nem mnae etl ia ne eae gles 
