Radcliffe and Welsh — Notes on Fishes from Chesapeake Bay. 41 



39. Lepotnis auritus (Linnaeus). Moccasin. 



Common in the Elk and Bohemia rivers. One small example from 

 Swan Creek. 



40. Lepotnis gibbosus (Linnaeus). Moccasin, Tobacco-box. 

 Abundant. 



41. Micropterus dolomieu (Lacepede). Black bass. 



One example, 35.2 cm. in length, weighing 1^4 lbs. taken in a pound- 

 net in the Bohemia Eiver. This example was afflicted with " pop-eye." 

 No others were seen. 



42. Micropterus salmoides ( Lacepede) . Oswego bass. 



BLACK BASS. 



Common in the Elk and Bohemia Rivers where many are taken in 

 pound-nets. The largest example seen was 49 cm. in length and weighed 

 \% lbs. 



Two small examples seen in Swan Creek. 



PERCIDjE. 



43. Perca flavescens (Mitchill.) Yellow perch. 



Abundant. It would appear from our measurements that in this region 

 this species attains a length of from 6 to 9 cm. one year after hatching, 

 and first breeds at the age of two years, when a length of 15 to 19 cm. is 

 attained. 



44. Hadropterus sellaris Radcliffe & Welsh. 



The type and co-type, both 4.9 cm. in length, were taken with a 25 ft. 

 seine, in a swift riffle of Swan Creek, near Havre-de-Grace, Maryland, on 

 May 2d. For description of this species see Bull. Bur. Fisheries, Vol. 

 XXXII, 1912 (1914), p. 29-32, pi. XVIII. 



45. Bolesoma olmstedi (Storer). 



Everywhere abundant. The differences in size and coloration between 

 the sexes of this species, which was in breeding dress, were very striking. 

 The average length of 38 adult males (5.5 to 8.7 cm.) was 7.36 cm. 

 Forty-five adult females (4 to 7.8 cm.) averaged 6.15 cm. in length. All 

 these fish were in spawning condition. The average length of examples 

 taken in the smaller streams was considerably less than of those from the 

 shores of the larger rivers. 



In the breeding males the ground color was a dark olive gray, darkest 

 dorsally, with saddles and W-shaped markings indistinct or absent; 

 vertical fins greatly enlarged ; membranes between the first and third 

 dorsal spines mesially jet black, rest of spinous dorsal with irregular 

 plumbeous mottlings; second dorsal and caudal with numerous wavy 

 plumbeous lines, these not extending onto lowermost rays of caudal ; anal 

 and ventrals slate-gray to slate-black; pectorals lighter with traces of 

 mottlings. 



