112 XJ. S. BUREAU OF FISHERIES 



Genus 290. LAGOCHILA Jordan and Brayton. Rabbitmouth swkers. 



Lagochila Jordan and Brayton, Proc. Acad. Nat. Sci. Phila., XXIX, 

 1877 280, (L. lacera Jordan and Brayton); not Lagocheilus, an 

 earlier genus of mollusks. 



Qiiassilabia Jordan and Brayton, Man. Vert., Ed. II, 1878, 406 {Lago- 

 chila lacera Jordan and Brayton) ; substitute for Lagochila, regarded 

 as preoccupied. 



793. Lagochila lacera Jordan and Brayton. Harelip sucker; Cut-lips; Split- 



mouth sucker; May sucker; Rabbitniouth sucker; Pealip sucker. 

 Mis.si.ssippi Valley; Ozark Mountains; Scioto, Tippecanoe, Clinch, 



Cumberland, and Chickamauga Rivers, and the White River of 



Arkansas; nowhere very common. 

 Lagochila lacera Jordan and Brayton, Proc. Acad. Nat. Sci. Phila., 



XXIX, 1877, 280, Chickamauga River, Ringgold, Ga. 



Family 90. CYPRINIDiE. Daces and minnows 



In arranging the genera of this by far the largest natural family of 

 fishes, we have begun the series with the forms having closest affinity 

 with Asiatic and then with European types — these having largely 

 five teeth in the main row on the pharyngeals. Later follow the 

 characteristically American forms, more or less degenerate as com- 

 pared with the possible European ancestors, the series closing with 

 aberrant forms from the same stock. 



Genus 291. ORTHODON Girard. 



Orthodon Girard, Proc. Acad. Nat. Sci. Phila., VIII, 1856, 182 {Gila 

 microlepidola Ayres) . 



794. Orthodon microlepidotus (Ayres). Blackfish. 



Larger rivers and lakes of central and northern California; generally 



abundant. 

 Gila microlepidola Ayres, Proc. Calif. Acad. Nat. Sci., I, 1854, 21, 



Sacramento and San Joaquin Rivers, Calif. 



Genus 292. ACROCHEILUS Agassiz. Chiselmouths. 



Acrocheilus Agassiz, Amer. Jour. Sci. Arts, XIX, 1855, 96 {A. alutaceus 

 Agassiz and Pickering). 



795. Acrocheilus alutaceus Agassiz and Pickering. Chisehnouth; Square- 



mouth; Hardmouth. 



Lakes and rivers of southea.stern Oregon; lower Columbia and tribu- 

 taries as far up as Spokane and Shoshone Falls. 



Acrocheilus alutaceus Agassiz and Pickering, Amer. Jour. Sci. Arts, 

 XIX, 1855, 99, Willamette Falls and Walla Walla River, Oreg. 



Genus 293. MYLOCHEILUS Agassiz. 



Mylocheilus Agassiz, Amer. Jour. Sci. Arts, XIX, 1855, 229 {M. lateralis 

 .\gassiz and Pickering). 



796. Mylocheilus lateralis Aga.ssiz and Pickering. Columbia River chub. 



Columbia and Frazer River Basins; ascending to Flathead Lake and 



Shoshone Falls. 

 Mylocheilus lateralis Agassiz and Pickering, Amer. Jour. Sci. Arts, 1855, 



231, Columbia River at Fort Vancouver; confused by recent writers 



with Leuciscus caurinus Richardson, which is a near relative of 



Richardsonius balteatus. 



797. Mylocheilus fraterculus Girard. 



Mylocheilus fraterculus Girard, Proc, Acad. Nat. Sci. Phila., VIII, 1856, 

 169, "Monterey, Calif."; a doubtful record, as no Mylocheilus has 

 been yet found in California; scales about 85; 77 in Mylocheilus 

 lateralis. 



Genus 294. MYLOPHARODON Ayres. 



Mylopharodon Ayres, Proc. Calif. Acad. Nat. Sci., I, 1855, 33 {M. 

 robustus Ayres = M ylopharodon conocephalus Girard). 



