( 34) 



has been done in the entire southern third of the state, that but slight idea 

 can be formed of the exact distribution or of the number of species which 

 exist there. The synonyms mentioned are only intended to connect the 

 names here given with those used in Prof. Jordan's Manual of the Verte- 

 brate Animals of the Northern United States. 



FAMILY PERCIDAE. 

 Genus MicToperca, Putnam. 



1. M. p'lmctulata, Putnam. Least Darter. Not uncommon in Fox 

 river, at Geneva, and in clear tributaries to Lake Michigan at Waukegan. 

 Not common in the Wabash valley. 



2. P. Jiahellatus, {Raf.^ Cope. Fan-tailed Darter. Common in clear 

 brooks in Wabash valley. 



3. P. lineolatus, {Ag.) Jord. Striped Darter. Found in clear streams 

 in Northern Illinois, where it replaces the preceding. 



■4. P. niger, {Pa/.) Jord. Trout Darter. Very rare in the Wabash 

 valley. 



Genus Poecilichth^s, Ag.* 



5. P. caendeus, (iStor.) Ag. Blue Darter. Common through Southern 

 Illinois, and especially abundant in the Wabash valley. 



6. P. spectabdis, Ag. Striped Blue Darter. Not so generally dis- 

 tributed as the preceding ; is confined to the northern part of the state. In 

 distribution this and the preceding species bear the same relations as P. line- 

 olatus and Jiahellatus. 



Genus Boleichihys^ Grd. 



1. B. exdis, Grd. Red-sided Darters. The only specimens I have 

 seen from the state were taken in a clear brook flowing into Lake Michigan 

 at Waukegan, where it was rather common. 



8. B. eos, Jordan, Mss. Common in small clear streams in Northern 

 Illinois and Southern Wisconsin. 



For the following synopsis of the species of this genus I am indebted 

 to Prof. Jordan : Tlie characters ascribed to B. fusiformis, B. erochrous 

 and B. barratti Ave from Cope (Proc. Phil. A, N. S., 1864, 233) ; those of 

 B. warreni from Grirard (Proc. Phil., A. N. S., 1859, 104;. 



*Lateral line distinct about to middle of first dorsal, on about 12 

 scales; 52 transverse rows; head Si in length; D. VIII — 9. Mass. 



fusvformis (^Grd.) 



** Lateral line distinct to middle of first dorsal, on 12 to 18 scales ; 

 head 4 in length. D. IX or X— 10. 



fScales in 42 to 44 transverse rows ; eye as long as snout, 5 in head ; 

 sides with dark band and reddish punctulations. New Jersey. 



erochrous ( Cope) 



•{•jScales in 45 to 50 transverse rows ; eye 3 to 3^ in head, longer than 

 snout; sides with a row of round crimson spots (in life) ; form slender. 

 Illinois to Montana. exilis i^Grd.) 



* Includes Catonotus, Notonolus and Puecilichthys. Jord. Man. Vert. 



