31. CYPRINID^ HYBOGNATHUS. 
155 
180. Z. sideu’iiJBn (Cope) Jor. 
Plijsiognomy of Apocope. Body fusiform. Head ratlier small, acu- 
minate. Mouth terminalj the ui)per jaw the longer, maxillary reaching 
line of orbit. IMouth forming more than a semicircle. Lower jaw hard, 
jess attenuate than is usual in Ryhognatlms. Eye small, 4yC in head. 
Fins long, the ventrals reaching anal. Color dark iron-gray above, a 
darker band of the same along the sides, above the lateral line, extend- 
ing from the end of the snout to the middle of the caudal. Head 4 ; 
depth 4. D. 8; A. 7 ; Lat. 1. 88; teeth 4-4. Arizona. {Cope.) 
(nyborliynchus siderius {laj)sus £ov Hyhognathus) Coiie, Zool. Wheeler’s Expl. W. 100th 
Mer. V, 070, 1870.) 
** Scales moderate, 55-00 in the course of the lateral line. 
181. Z. pitamlhcgiBBB (Grd.) Jor. & Gilh. 
Body rather slender. Head moderate, rounded in front. Color uni- 
form, sometimes a black spot at the base of the caudal. D. 8 ; A. 7 ; Lat. 
1. 58 ; teeth 4-4. Arkansas and Indian Territory. {Girard.) This spe- 
cies may, perhaps, be referable to Hybognathus. 
{Dionda gylumbea and spadicea Girard, Proc. Acad. Nat. Sci. Phila. 1856, 178: Hybo- 
rbynclius puniceus, Grd. 1. c. 170 : Dionda yrisea, Grd. U. S. Pac. R. R. Surv. x, 230.) 
77. — llYBOCrKfATiaUS Agassiz. 
{Alyoma and Dionda Girard.) 
(Agassiz, Amer. Journ. Sci. Arts, 185.5, 223: tyj)e Hybognathns nuclialis Ag.) 
Body elongate, somewhat compressed. Mouth horizontal. The jaws 
normal, sharp-edged; lower jaw with a slight, hard protuberance in 
front; no barbel; upper jaw protractile. Teeth 4-4, cultriform, with 
oblique grinding surface and scarcely any hook. Alimentary canal 
elongate, about 4 times the length of the body. Peritoneum black. 
Scales large. Lateral line continuous. Dorsal over ventrals. Anal 
basis short. Size moderate. Species numerous ; mostly southwestern, 
and little known. gibbous ; yyaLOo-:, jaw.) 
* Body comparatively elongate, little coaqiressed, the depth less than two-sevenths of 
the length. 
a. Suhorhital hones comparatively long and narrow. 
slightly included ; the premaxillary helow the level of the eye; the maxillary just 
reaching the front of the eye. Lower jaw thin-edged, with a slight symphyseal knob. 
Eye small, 6 in head. Scales small. Lateral line complete, decurved. Dorsal 
slightly behind ventrals. Dusky bluish above ; everywhere with dark points. A 
black spot at base of caudal. Head 4; depth 4-18. D. 8 ; A. 7 ; scales 10-50-8; teeth 
4-4. L. 7 inches. Lake Tupataro, Guanajuato, Mexico (west of the Sierra Madre). 
(Jordan, Proc. U. S. N.at ATna iw-o n 
