()2 



rid. Mouth lar^e; lower jaw projecting' X. heterodox. 



bb. Sides without black stripe (diisi<y or silverj'); sometimes dusted on sides and 

 head with black specks. 



e. Fourteen to IT scales before dorsal. 



f. Anal rays 7 or 8. 



K. Dorsal stripe r 'resent; no caudal spot N. BLENNICS. 



fCff. No dorsal stripe. 



h. Dorsal ravs 8, anal 8; fins higii.^ 



hli. Dorsal rays 7. anal 7 N. SCVLLA. 



ff. Anal ravs 9; sides dusted with black specks N. gilberti 



ee. Twelve sc des before dorsal, 

 i. F^ye small, '4 leng^th of head.' 



ii. Eyelarpre,!,-? lenprth of head or larger M. shcmardi. 



aa. Body compressed, at least posteriorly; depth noticeably g^reater than width; (head 



some limes thick). 



j. A black spot at base of caudal X. HCDSONiCs. 



n. No spot at base of caudal. 



k. Scales before dorsal not much finer than else\\ here on the body. 



I. Anal of 7 to 9 rays. 



m. Body deep, compressed; length .3 to 6 inches. 



n. Scales uniform in size; body not heavy forward; regularly marked with diagonal 

 lines forming lozenge on sides of scales; black lateral stripe made up of small 

 diagonal bars on posterior half of body; dorsal tin usually with a black spot on 



po.sterior rays; no red coloration X. \Vhipplii. 



nn. Bodv heavy before dorsal; nape high; much red coloration in adult males; mouth 



large; scales somewhat crowded forward, 

 o. Lengtii of exposed portion of scales equal to about ig depth of scales; eye not 



large X. i.utre.vsis. 



00. Scales very deep, length of exposed portion narrow on forward part of body and 

 rows running out behind dorsal fin; eye large in young, variable in adult. 



X. corxctus. 

 mm. Body rather stout; not much compressed; head thick, depth of bodv 14 to 1-5 of 

 length; silvery tishes without red or yellow coloration of body or tins. 



p. Anal rays 9; eye 5-13 of head; lateral line much de urved N. .■\riommcs. 



rip. Anal rays 7; eye 3-11 of head X. JEjrxvs. 



II. Anal fin of 10 of 11 rays; body elongate, silvery; depth 4-19 to 1-6 of length; eye 



large; mouth large, oblique, 

 q. Depth 2- 11 to 1-6 of length. 



r. Lateral line much decurved: mouth and eye moderate X. ATHERIXOIDES. 



rr. Lateral line nearlv straight; mouth and eve large '. X. arge. 



qq. Dept 4-19of length. 



s. Seven rows of scales between lateral line and dorsal fin; eye ^3 lengrth of head; 



mouth small. oblique X. DILECTCS. 



ss. Five rows of scale between lateral line and dorsal fin; eye I4 of head; mouth large 



and very oblique X. RVBIFROXS. 



kk. Scales before dorsal very fine, not in regular rows, about 30 on median line; 



lx)dv n"t much elongate. 



t. Anal ravs 10 to 12 X. UMBRATILIS. 



tt. Anal rays 9 X. CORXUTCS. 



Notropii^ anorjenus Forbes. 



Taken from the Fox at McHenrj' and South Chicago. 



Notrnpis cayiKja Meek. (98b) 



Tail forked; mouth not so large as in the next and less oblique. A dark stripe around the 

 snout and through the eye, continued on the sides to the base of the caudal fin as a dusky 

 band which is crossed by numerous darker crescentic or X-shaped marks. 



Xot abundant, although found in 45 localities, distributed throughout the State. Occurs most 

 frequently in the Illinois River and northward. 



Notropls hetcrodon (Cope). 



External appearance so much like that of A'. crtj7/^« as to lead easily to their confusion, 

 "differs from the latter in the larger more oblique mouth, the lower jaw partaking at its edges 

 of the black of the lateral band. 



Not uncommon in the streams to the northward of the Illinois River. Widely distributed, 

 but rare southward. 



Notropis bleniiius (Girard). — Sti'aw-colored Minnovv. (lO."^) 



A very plain minnow, wholly without striking color marks. Scales faintly edged with 

 dark brown; a brown, mid-dorsal stripe, which is broader at the base of the dorsal fin than 

 elsewhere. Muzzle decurved; tiiouth almost horizontal. 



A common species, quite regularly distributed throughout the State. Occurs in 174 col- 

 lections. 



Notropis scylla (Cope). (10.5) 



Very much like the preceding, but with short, stout body, blunt head and rather small 

 mouth. 



Rare in Illinois. Specimens in six collections, from central and western Illinois, have 

 been referred to this species. 



' Care must be taken to avoid confusion of coyug-a. inwgends and hetcrodon. particularly 

 hetcrodon. with Hyhoguntlnis inihila. 



■ A', vo/iteeltus: not certainly known to occur in Illinois. 

 ^A^. loiigirostris: not certainly known to occur in this State. 



