15C CONTRIBUTION'S TO NORTH AMERICAN ICHTHYOLOGY - IV. 



182. II. iHH-hal:* A-:. Silvery Minnow. 



I'.ody elongate, companit ivcly slender. Head moderate, rather .short, 

 tin- profile evenly curved. F\ e large, rather longer than mu/y.le, about 

 4 in head. I'pper jaw heavy; lower jaw thin. Scales large and silvery. 

 Lateral line deeiirved, ll'-ll large scales in front of dorsal. Olivaceous 

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

 tions. Fins unspotted. Head 4; depth 4 1. D. 8; A. 7; teeth 4-4; 

 scales .~)-;;,S-l. L. .">-7 inches. A graceful minnow, abundant in most 

 streams from Xew -lersey to the Upper Missouri and southward. As 

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

 authors are unable to distinguish them.) 



(Aji.-isM/, Ainrr. Journ. Sui. Arts, 18.">f>, 224; Giinthcr, vii, 184 : Hytognalhus argyrtfis, 



</(/(/.-/. and //"'- *'rl. Proc. A< ad. Nat. Sei. Phila. 18."><>, 182, 2(>l>: Hi/buy nath it* mjiua 

 (iiinthcr. \ii. !.-'.">: Hybognathue onmerinus Cope, Proc. AUKT. 1'liil. !Soc. Phila. l~7u. 

 4iii'i : lli/h-xjiiatltiix (iri/iii Hi* Jordan, Xi8S).) 



183. II. aiiiartlS (Grd.) Jordan. 



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



Q 



elivous, as in If. nuchalis. Suborbital bones rather narrow, about as in 

 11. nuchal in. Scales moderate, 1C iu front of the dorsal. Coloration of 

 H. )n<chii1iN,\mt size much smaller. D. 8; A. 7; Lat. 1. 35-38; teeth 

 4-4. Rio Grande region. 



Grd. Proc. Acad. Nat. Sci. Phila. 1856, 180.) 



. II. flavipiamos Cope. 

 "This fish differs I'lom IT. aryyntix (nitcJuilin of the present memoir) in 

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

 tally oval, its length 1''.-; in head, and equal to interorbital width. The 

 nm/./le is shortly dectirved to the mouth, which is terminal and short. 

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

 mu/./le to the line of the orbit. Origin of ventral lins below or a little 

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

 not nearly reaching the ventral, which in turn falls far short of (In- 

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

 and rather wide, the interorbital region neail\ Hat. Color dnsk\ abo\e, 

 a \\ide dusky lateral band, separated b\ a pale band from the back. A 

 t.iinl dark .->pot at ha M- of caudal. Fill* pale yellow, unspotted. Head 

 .V in length, \\ilh caudal I'm; depth a little more. D. 8; A. 7 or S; 

 >eales 7-11-1. L. _; inches. Llano Kiver, Texas." (Coy;r, MSS.) 



II. EII^I ol;rni:i! us ('.>])<. 

 Similar to //. /la i-i/iinnix, Imt with larger scales. Ventral fin origi- 

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



