McAfee and Weed — Fishes of Vicinity of Plummers Island, Md. 7 



flows two ways from a point at the western end of the island 

 where is the mouth of a small creek; the maximum depth is 

 about 8 feet. During floods a broad strong current sweeps 

 through this channel, the water often rising as much as 15 feet 

 above the ordinary level. 



This channel is used as a breeding place by black bass, sun- 

 fishes and catfishes. 



LIST OF SPECIES. 



Ictalurus punctatus Ericymba buccata 



Ameiurus catus Rhinichthys atronasus 



nebulosus Hybopsis kentuckiensis 



natalis Anguilla rostra ta 



Schilbeodes insignis Dorosoma cepedianum 



Catostomus commersonii Pomoxis sparoides 

 Semotilus atromaculatus " annularis 



Notemigonus crysoleucas Chaenobryttus gulosus 



Pimephales notatus Lepomis cyanellus 

 Notropis amoenus " auritus 



analostanus " gibbosus 



cornutus Micro pterus dolomieu 

 hudsonius " salmoides 



Boleosoma olmstedi 



The Main River. 



The Potomac between Great Falls and Little Falls is character- 

 ized by its rocky shores and bed, its numerous rapids, alter- 

 nating with deep stretches and its exceedingly irregular bottom. 

 There is almost no aquatic vegetation. Off Plummers Island 

 soundings of 80 feet have been obtained; at ordinary stages the 

 river here is about 100 yards wide. A mile above the island is 

 a rather important rapid known as Stubblefield Falls; a small 

 rapid begins a quarter of a mile below. 



The names of many fishes inhabiting the main river need not 

 be repeated here, as a complete list would include all species 

 previously recorded for the lower reaches of brooks as well as 

 those found in the channel behind Plummers Island All of 

 these must at times travel about in the' river, and collections in 

 the main river, no matter where, would yield some of them. 

 The following species include those which so far as known are 

 confined to the main river, together with several (starred) whose 

 place of occurrence it is desirable to definitely record. 



