156 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 



182. H. JBUChalBS Ag. — Silvery Minnow. 



Body elongate, comparatively slender. Ilead moderate, rather short, 

 the i)rofile evenly curved. Eye large, rather longer than muzzle, about 

 4 iu head. Upper jaw heavy; lower jaw thm. Scales large and silvery. 

 Lateral line decurved, 12-14 large scales in front of dorsal. Olivaceous 

 green above, translucent in life ; sides clear silvery, with bright reflec- 

 tions. Fins unsi)otted. Head 4; depth 4^. D. 8; A. 7; teeth 4-4; 

 scales 5-38-4. L. 5-7 inches. A graceful minnow, abundant iu most 

 streams from New Jersey to the Ui)per Missouri and southward. As 

 here defined, more than one species may be included ; but, if so, the 

 authors are unable to distinguish them.) 



(Agassiz, Anier. Jourii. Sei. Arts, 1855, 224; Giinther, vii, 184 : Hybofjnaihus arfjyriUa, 

 evansi, and r eg iiis Grd. Proc. Acad. Nat. Sci. Pliila. 185(i, 182,209: Hijboijnathus regius 

 Giintlier, vii, 185: Hgbognathns osmerinus Cope, Proc. Amer. PMl, Soc. Phila. 1870, 

 466: II (fbognallins argytUi)^ Jordan, 2S9.) 



1§3. H. ainarus (Grd.) Jordan. 



Head very short, small and blunt ; front convex rather than de- 

 clivous, as in H. nuclialis. Suborbital bones rather narrow, about as in 

 H. nuchaUs. Scales moderate, 10 in front of the dorsal. Coloration of 

 a. nuchaUs, hut size much smaller. D. 8 ; A. 7 ; Lat. 1. 35-38; teeth 

 4-4. Eio Grande region. 



{Algoma amara Grd. Proc. Acad. Nat. Sci. Pliila. 1856, 180.) 



^§4. M. flavipisiBiis Cope. 



"This fish differs from H. argyritis {nuclialis of the present memoir) in 

 the smaller scales and quite diiferent coloration. Eye large, horizon- 

 tally oval, its length 2g in head, and equal to interorbital width. The 

 muzzle is shortly decurved to the mouth, which is terminal and short. 

 The extremity of the maxillary extends half way from the end of the 

 muzzle to the line of the orbit. Origin of ventral fins below or a little 

 in advance of the base of the first dorsal ray. The pectoral is short, 

 not nearly reaching the ventral, which iu turn falls far short of the 

 vent. The lateral line rises anteriorly. The occipital region is convex 

 and rather wide, the interorbital region nearly tlat. Color dusky above, 

 a wide dusky lateral band, separated by a pale band from the back. A 

 faint dark spot at base of caudal. Fins pale yellow, unspotted. Head 

 5-| in length, with caudal fin; depth a little more. D. 8; A. 7 or 8; 

 scales 7-41-4. L. 2i| inches. Llauo Eiver, Texas." {Cope^ MSS.) 



1^5. II. siB^i'ota;niatiis Cope. 



Similar to H. Jlavipuum, but with larger scales. Ventral fin origi- 

 nating a little in advance of the first dorsal ray. Eye large, a little 



