31. CYPRINIDyE HYBOGNATHUS. 157 



less than one-third the length of the head and a little less than the in- 

 terorbital \^'idth. Ventral fin nearly reaching vent. Color dnsky, with 

 a black lateral band. Fins plain. Head 5 in length, with candal ; 

 depth the same. D. 8; A. 8; scales 5-34-3. L. 2.^ inches. Medina 

 River, Texas. {Cope^ MSS.) 



(id. Suborbital bones short ami deep. 



1§6. H. placitiis Old. 



Head short and bluntish. Body stoutish. Eye small, shorter than 

 snout, about 5 in head. Scales moderate, about 10 in front of the dor- 

 sal. Size comi^aratively small. Grayish above, silvery below. Head 

 4f ; depth 4i. D. 85 A. 7; Lat. 1. 40; teeth 4-4. Mississippi Valley to 

 Utah. (Possibly two species are here included.) 



(Girard, Proo. Acad. Nat. Sci. Phila. 1856, 182: Ilyhofinatlius nucJialis Cope, Proc. 

 Aiiier. Phil. Soc. Phila. 1874, G(i: Hyhognaihus nuclialis Jordan, 289; ju-obably uot of 

 Agassiz.) 



ana. Suboiljital bones nnlaiown; small species of the Texan vogiou. 

 ISy. H. Cpiscopus (Grd.) Jordan. 



Slender and graceful, fusiform in i^rofile, and compressed, with the 

 back slightly arched. The head is large, forming about the fifth of the 

 length. Eye large and subcircular, tlie diameter 3^ in head. Fins 

 moderate. Scales large, the lateral line Ibllowing the middle of the 

 flanks. Dusky above, a blackish band along the sides, ending in a 

 dusty blotch at base of caudal. Fins unmarked. Scales with fine 

 black dots. D. 8; A. 8; Lat. 1. 39. L. 3 inches. Rivers of Texas. 

 {Girard.) This or some very siuular species occurs in Southern Illinois. 

 {Forbes.) 



{Diondu episcopa, sercna, texenms, papaVis, aryndosa, and chryfiltis Girard, Proc. Acad. 

 Nat. Sci. Phila. 18."j(), 177-178.) 

 18§. II. (UaviaSalBS (Grd.) Jor. 



Form, size, and coloration of II. anutrus, but the mouth and eye 

 smaller and the scales smaller. D. 8; A. 7-, Lat. 1. 40; IG scales before 

 dorsal. Snout tuberculate in spring males, ]^^e^v Leon. {Girard.) 



(Algoma Jluciatilis Grd. Proc Acad. Nat Sci. Phila. 1850, 181.) 

 ** Body short, tleep, compressed, the depth about two-sevenths of the length. 

 189. II. lll<'i:iBlO(>« (Grd.) Jor. 



Head moderate, 4.^ in length. Snout rounded. Eye medium. Black- 

 ish above; sides smoky, with black dots; a black spot at base of caudal. 

 Depth 3.J. D. 8; A. 7; Lat. 1. 43; teeth 4-4. L. 2.] inches. Rio Grande 

 region. {Girard,) 



(Dio)idn mrlanop^ and conchi Grd. Proc. Acad. Nat. Sci. Phila. 1856, 178; Jordan, 

 Bull. U. S. Geol. Surv. iv, No. 2, 402.) 



