102 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY III. 



tical, 17-98 to lO.Vl? ; fins excessively developed, much 

 more elevated in the males than in the females, the free 

 border of the dorsal, in the males at least, deeply incised : in 

 the males, the height of each of the three vertical iins is 

 greater fhan the length of the head: dorsal rays i:], its 

 beginning rather nearer snout than base cf dorsal : eaudjlfin 

 especially strong, the rudimentary rays at its bast" nnusually 

 developed : least depth of caudal peduncle less than one-third 

 length of head : coloration rather silvery, the males proltably 



rosy and tuberculate in spring latipinnis, 36. 



$$Fontaue]lo almost obliterated, reduced to a narrow slit: each jaw with a well- 

 developed cartilaginous sheath (as in Pavtosliits). 

 j. Body subterete, compressed behind, the depth 5 in length : in- 

 terorbital 6i)ace 2 in head : head quite short, broad and 

 rounded above, 4f in length : eye small, far back and high up, 

 6 in head : mouth very large, inferior, beneath the projecting 

 snout : upper lip very full, pendent, with alx^nt 5 rows of tu- 

 bercles Uiion it : lower lip very full, moderately incised, with 

 about 10 rovjs, a notch separating the upper lip from the 

 lower, each jaw with a slightly curved cartilaginous sheath on 

 its edge, the two parallel with each other and fitting closely 

 together: iins small: dorsal rays 11; caudal little forked: 

 scales 15-90-11, very much reduced forwards and subject to 

 many irregularities : colors dusky : size small .. discobolus, 36. 



24. CATOSTOMUS NIGRICANS Le Sueur. 



Iloij Sucker. Hog Mullet. Hop Molly. Cr<url-a-holtoiii. Slone Holhr. Slotie Toiei: 

 Stone l.iifitjer. Hammerhead. Mud Sucker. 



a. Subspecies nigricans. 



1~17 — Catohtomus nigricans Lk Suki'i:, Jouru. Ac. Nat. Sc. Phila. 102. 

 Catoxtomus nigrans (sic) Kiktlaxd, Rept. Zool. Ohio, 168, 1838. 

 Caiostomus nigricans DeKay, New York Fauna, part iv, Fishes, 202, 1842. 

 CatostojHus nigricans CrviiCR & Valkn'CIKNNKS, Hist. Nat. des Poiss. xvii,453, 



1844. 

 Catoslomus nigricans Stokeh, Synopsis, 421, 1846. 



Hylomyzon nigricans ACfAs.siz, Am. Jourii. Sci, Arts, 2d eerioe, xiN,205, 1855. 

 Hijlomiizon nigricans PiTNAM, Bull. Mus. Conip. Zool. 10, I860. 

 Hijlonii/zon nigricans Coi'K, Proc. Ac. Nat. Sc. Phila. 285, 1^64 

 Catoslomus nigricans Con:, Journ. Ac. Nat. So. Phila. 236, 1868. 

 CatostonniM nigricans OOntuki:, Cat. Fishes Brit. Mus. vii, 17, 1868. 

 Catostomus nigricans C<»rr, Proc. Am. Pliilos. Soc. Phila. 4C8, 1870. 

 nglomiizon nigricans J()RI>an, Fishes of Ind.221, 1875. 

 Hiipen'elium nigricans Jordan, Bull. Buffalo Soc. Nat. Hist. 95, 1876. 

 Iliipenlrlium nigricans JoitDAN, Man. Verf.294, 1876. 

 I'atostomus nigricans I'lii.KU & Llur.KK, Fishes of Maryland, 138, l"^?'} 

 Ilypentelium nigricans Ni:i>;on, Bull. No. 1 , Ills. Mus, Nat. Hist. 48, I87f^ 



