Jordan and Ever maun. Fishes of North America. ' 215 



Grande ; abundant. (emaKOKoc , bishop or pope, a remote allusion to Cap- 

 tain, afterwards General, John Pope, in charge of the party by which the 

 species was collected.) 



Dionda episcopa, GIRARD, Proc. Ac. Nat. Sci. Phila., 1856, 177, headwaters of Pecos River, 



and Comanche Spring, tributary to Rio Grande. (Type, No. 4o. Coll. Capt. Pope.) 

 Dionda texensis, GIRARD, Proc. Ac. Nat. Sci. Phila., 185G, 177, Nueces River, Texas. (Type, 



No. 44. Coll. Clark.) 

 ? Dionda argentosai, GIRARD, Proc. Ac. Nat. Sci. Phila., 1856, 178, San Felipe Creek and Devil 



River, tributaries of the Rio Grande, in Texas. (Type, No. 32. Coll. Clark.) 

 HyboijnatJius Jlu-'qtonii*, COPE, Bull. U. S. Nat. Mus., xvn, 36, 1880, Johnson's Fork of Llano 



River, in Kimble County, Texas; JORDAN & GILBERT, Synopsis, 156, 1883. 

 ? Hybognatlm* (I>i<>ix In) jmnctifer*, GARMAN, Bull. Mus. Comp. Zool., vm, 89, 1881, Parras, and 



spring near Saltillo, Coahuila, Mexico; JORDAN & GILBERT, Synopsis, 884, 1883. 

 HHbfigtintlms <'ii-!U* 3 , COPE, Trans. Amer. Philo. Soc., 1884, 167, Monterey, New Leon. 

 HybognalJiHn episcopw, JORDAN & GILBERT, Synopsis, 150, 1883. 

 Dionda punctifer and episcopa, EVERMANN & KENDALL, Bull U. S. Fish Comm., xn, 1892, 99. 



345. HYBOGNATHUS NUBILA (Forbes). 



Head4|; depth 4; eye 3. D. 8; A. 9; scales 5-37-3; teeth 4-4, little 

 hooked. Head narrow; mouth inferior and horizontal. Lateral line 

 anteriorly deflexed. Eye large, rather longer than muzzle. 14 scales 

 before dorsal. Color very dark; a dark lateral band from muzzle to base 

 of caudal; fins all plain. Length 2i inches. Western Illinois, west to 

 Wyoming, and southwest to the Ozark region, abundant. Close to H. 

 ejmcopa, but differing in the more pointed snout and larger mouth, the 

 cleft 4 in. head, not 5 as in H. episcopa. (nubilus, dusky.) 



Albnrnops nubiln*, FORBES, Bull. 111. Lab. Nat. Hist., IT, 56, 1878, Rock River, Ogle County, 



Illinois. (Type, No. 28410. Coll. Forbes.) 

 Cliola nubila, JORDAN & GILBERT, Synopsis, 167, 1883. 



346. HYBOGNATHUS AMARA (Girard). 



Head 4 ; depth 4 ; eye %. Dorsal 8 ; A. 7 ; lateral line 35 to 38 ; teeth 4-4. 

 Body elliptical, rather chubby. Head short and blunt; front convex. 

 Suborbital bones rather narrow. Eye moderate, about as long as snout. 

 Scales moderate, 16 in front of the dorsal. Silvery ; no dark lateral band, 

 nor caudal spot. Rio Grande. Possibly the young of H. nuchalis or some 

 similar species; perhaps identical with H. argentosa. (amarus, bitter, the 

 type being found in brackish water.) 



Algoma amara, GIRARD, Proc. Ac. Nat. Sci. Phila., 1856, 180, Lagoon near Fort Brown, 



Texas. (Type, No. 149. Coll. Clark.) 

 Algamafluvuxtilw, GIRARD, Proc. Ac. Nat. Sci. Phila., 1856, 181, near Monterey, New Leon; 



GIRARD, U. S. & Hex. Bound. Surv., Zool., 45, pi. xxvn, figs. 17-20, 1859. (Coll. Couch.) 

 HybognathnsJJnriatiUs, JORDAN & GILBERT, Synopsis, 157. In Girard's figure, ftnviatUu has smaller 



scales than amara, about 40 in lateral line, but the plates of the Mexican Boundary Survey 



are very untrustworthy. 

 Hybognathus amarus, JORDAN & GILBERT, Synopsis, 156, 1883. 



'One of the types of D. argentosa, recently examined, gives: Head 3; depth 3%; eye 3%, 

 and is heavier and stouter than typical episcopa ; the dorsal is less anterior. Possibly a distinct 

 species. 



'Hybognathuspunctifer, GARMAN, from Laguna del Muerte, Coahuila is not evidently different. 

 Scales 6-40-3. Head 4; depth 4; the form stouter than in II. episcopa. 



3 Hitbogn(it)iHs ciKtlis, COPE, from Monterey, New Leon, is also not appreciably different. 

 Lateral stripe faint or obsolete; depth of body equal to length of head, 5% in total with caudal; 

 eye 3% in head; pectorals not reaching vcntrals. 



All these last (argentosa, punctifer, civilis) may belong to a distinct species, (HfboftaOuU argcn- 

 tosa), allied to //. episcopa, but stouter, with smaller eye, and the lateral band faint or obsolete, 

 the ' 'sides silvery as if painted with quicksilver." 



