(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 Microperca , Putnam. 
1. M. punctulata, Putnam. Least Darter. Not uncommon in Fox 
river, at G-eneva, and in clear tributaries to Lake Michigan at Waukegan. 
Not common in the Wabash valley. 
2. P. jiabellatus , ( Raj 1) 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 , ( Raf ’.) Jord. Trout Darter. Very rare in the Wabash 
valley. 
Genus Poecilichthys, Ag* 
5. P. caeruleus, (/$W.) Ag. Blue Darter. Common through Southern 
Illinois, and especially abundant in the Wabash valley. 
6. P. spectabilis, 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 Jiabellatus. 
Genus Boleichthys * Grd. 
7. B. exilis , Grd. Bed-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 : The characters ascribed to B. fusiformis , B. erochrous 
and B. barratti are from Cope (Proc. Phil. A. N. S., 1864, 233) ; those of 
B. warreni from Girard (Proc. Phil., A. N. S., 1859, 104). 
^Lateral line distinct about to middle of first dorsal, on about 12 
scales; 52 transverse rows; head 3i in length; D. VIII — 9. Mass. 
fusij'ormis ( 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) 
-j-fScales 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 ( Grd .) 
* Includes Catonotus, Notonotus and Poecilichthys. Jord. Man. Vert. 
