16 



fl. Analra78 9; sides dasted with black specks N. oilbebti, 



ee. Twelve scales before dorsal, 

 i. Eye small. 14 length of head.' 



li. Eye large. ^ length of head or larger N. shcmabdi. 



aa. Body compressed, at least posteriorly; depth noticeably greater than width; (head 

 sometimes thick). 



j. A black spot at base r>f caudal N. HCDSOVics. 



jj. No spot at base of caudal. y 



k. Scales before dorsal not much finer than elsewhere on the body. 



I. Anal fin of 7 to 9 rays. 



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



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

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

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

 posterior rays; no red coloration N. whipplii. 



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

 mouth large; scales s^omewhat crowded forward. 



o. Length of exposed portion of scales equal to about *a depth of scales; eye not 



large N. luteensis. 



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. 



N. CORNUTrS. 



mm. Body rather stout; not much compressed; head thick; depth of body H to i-5 

 of length; silvery fishes without red or yellow coloration of body or ins. 



p. Anal rays 9; eye 6-13 of head; lateral line much decurved N. ariommcs. 



pp. Anal rays 7; eye 311 of head N. .tejunus. 



II. Anal fin of 10 or 11 rays; body elongate, silvery; depth 4-19 to 1-fi 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 N. athbrinotdks. 



rr. Lateral line nearly straight; mouth and eye large N. abgk. 



qq. Depth 4-19 of length. 



8. Seven rows of scales between lateral line and dorsal fin; eye 'a length of head: 

 mouth small, oblique N dilectus. 



ss. Five rows of scales between lateral line and dorsal fin; eye ^ of head; mouth 

 large and very oblique N. rubifrons. 



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

 body not much elongate. 



t. Anal rays 10 to 12 N. tjmbratilis. 



tt. Anal rays 9 N. cornctus. 



Notropis anogenus Forbes. 



Taken from the Pox at McHenry and in South Chicago. 



Notropis cayuga 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. 



Not abundant, although found in 45 localities, distributed throughout the State. Occurs 

 most frequently in the Illinois River and northward. 



Notropis heterodon (Cope). 



External appearance so much like that of N. caynaa 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. 



iV^. lotiairoatris : not certainly known to occur in this State. 



