g6 FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. i. 



tends, in the latter species, to arrange itself in cross-bands; in the 

 former, more in longitudinal rows of spots. L. gibbostis may even 

 have a little mottling on the hinder dorsal rays, which simulates that 

 on the dorsal of L. pallidus. 



24. Micropterus salmoides (Lac.}. LARGE-MOUTHED BLACK BASS. 

 Many fine specimens of this fish were seen in the catches of the 



fishermen. 



25. Etheostoma jessiae asprigine (Forbes}. 



(Pcecilichthys aspriginis, Forbes in Jordan's Cat. of the Fishes of 

 Illinois, 1877, p. 41). 



Three specimens of this little fish were secured, the largest of 

 which has a total length of i^ inches. My specimens are in some 

 respects different from published descriptions of this form. The 

 cheeks and opercles are scaly and the lateral line is incomplete. The 

 fin formula is D. X, 12; A. II, 7. The soft anal rays are thus some- 

 what reduced in number. The scales are 5-53-8. Head rather long, 

 in the length to caudal 3^3 times. Depth in the length 4^. 

 The dusky color on the sides assumes the form of squarish blotches, 

 about a dozen in number from the head to the tail. From these the 

 color, more faintly developed, runs upward and downward, so as to 

 produce cross-bands. 



26. Perca flavescens (Mitch.*}. YELLOW PERCH. RINGED PERCH. 



A single specimen having a total length of 6^ inches was 

 secured. In Illinois this species has been reported from the Illinois 

 River at Pekin. In the Wabash River it has been taken as far south 

 as Terre Haute. I was told by a fisherman at Havana that he had 

 seen this perch at Meredosia, sixty miles further down the Illinois 

 River. 



27. Morone interrupta Gill. YELLOW BASS. 



Three specimens were obtained. Two were adults, and one a 

 young fish having a total length of a little less than two inches. 

 This is very pale in color, with only feeble indications of the longi- 

 tudinal stripes on the upper half of the body. 



The yellow bass is especially an inhabitant of the lower Missis- 

 sippi valley, but it has been taken as far north in the Illinois River as 

 Henry (Jordan, Cat. of the Fishes of Illinois). 



28. Roccus chrysops (Raf.}. WHITE BASS. 



One specimen, nine inches long, total length, was secured. This 

 is a fish of northern range, being common in the Great Lake region. 



