36 Proceedings of the Biological Society of Washington. 



ACIPENSERID.E. 



2. Acipenser sturio Linnaeus. Sturgeon. 

 This species is reported to be very scarce. None seen by us. 



Lepisosteid^;. 

 3. Leplsosteus osseus (Linnaeus). Black gar. 



A single example 85 cm. in length, weighing 434 lbs., was taken in a 

 fyke-net in the Bohemia River. 



SlLUKID.35. 



4. Ameiurus catus (Linnaeus). White cat. 

 Abundant, and of considerable market value to the pound-net fishermen. 



5. Ameiurus nebulosus (LeSueur). Yellow cat. 



More abundant than the preceding species. Individuals ranged in 

 color from a uniform muddy yellow through various degrees of marbling 

 to a uniform dark slate, almost black. 



Catostomid^;. 



6. Carpiodes cyprinus (LeSueur). Carp sucker. 



A single example, 34.8 cm. long, taken in a shore seine at Cherry Tree 

 Point, in brackish water. 



7. Catostomus commersonii (Lacepede). Sucker. 



Common. The largest example seen was 45 cm. in length and weighed 

 2 lbs. 



8. Hypentelium nigricans (LeSueur). 



An example 23.6 cm., taken in a pound-net in the Elk River, and a 

 small one in Swan Creek, were the only examples seen. 



9. Erimyzon oblongus (Mitchill). Chub sucker. 



Two males, 21 and 20 cm. long, from Bohemia River and Swan Creek. 

 The larger example shows, in addition to the three tubercles on each side 

 of the head usual in breeding males of this species, a fourth and smaller 

 tubercle on each side just below a line from nostril to pupil. Both ex- 

 amples have numerous small excrescences on the anal fin, largest on basal 

 portion; in the smaller example there are also excrescences on the lower 

 caudal lobe, under side of caudal peduncle, and along sides nearly to base 

 of ventrals. 



These examples agree with specimens taken by us in the Chesapeake 

 and Ohio Canal at Seneca, Maryland, and with an example in the U. S. 

 National Museum from New Bedford, Mass. We have compared these 

 examples with two examples of E. sucetta, one from Savannah, Georgia, 

 and the second from Lost Lake, Indiana, and find the difference in scal- 

 ing between the two species to be as follows: 



