FISHES OF PENNSYLVANIA. 27 

Fins all large; the dorsal base equals two-thirds length of head, while the pectoral 
is considerably longer than dorsal. Caudal moderately forked. Lateral line fully 
developed, on median line of body. Scales moderate, equal. D. 11; A.7; V.9; 
Scales, 7-52-7. Specimen examined, No, 8446, United States National Museum, 
from Cayuga lake, New York. 
The stone roller has a wide distribution and a wonderful variety of 
common names. Among them are hammer head, stone lugger, stone 
toter, crawl-a-bottom, hog molly, hog mullet, mud sucker, hog sucker, 
banded sucker, large-scaled sucker and black sucker. The name shoe- 
maker was formerly applied to this species in Lake Erie, perhaps on 
account of the resemblance of its color to that of shoemaker’s pitch. 
Prof. Cope says that this species in Pennsylvania is most abundant in 
tributaries of the Ohio and in the Susquehanna, while in the Delaware 
itis uncommon. It ranges from western New York to North Carolina 
and westward to Kansas. It is the most remarkable looking of all the 
suckers in Pennsylvania, and may always easily be distinguished by the 
shape of its head. The species grows very large, reaching a length of 
two feet. It delights in rapid streams of cold, clear water. Its habit is 
to rest quietly on the bottom, where its color protects it from observa- 
tion. It is sometimes found in small schools. The spawning season 
is In spring and the young are found abundantly in small creeks as well 
as in the rivers. The food consists of insect larvee and small shells, and 
it is especially fitted for securing its prey under stones in the rapids. 
As a food fish this sucker has little value. 
Genus ERIMYZOWN Jorpavy. 
34. Erimyzon sucetta (Lactripe). 
The Chub Sucker. 
The body of the chub sucker is oblong, rather deep and compressed, its depth one- 
third of the standard length. The head is rather short, broad above, its length one- 
fourth of total length to caudal. The mouth is rather small and but slightly inferior, 
protractile. The eye iscontained five times in length of head, and slightly less than 
twice in its distance from tip of snout. Dorsal short, rather high, placed in middle 
of length; ventrals directly underneath dorsal. Highest dorsal ray (fourth), not 
quite equal to second anal ray ; about two-thirds length of head. Caudal slightly 
forked. No lateral liné. D. 11; A.7; V. 7. Scales, 37; transverse, 13. Described 
from No. 27,867, United States National Museum, from Illinois ; length, nine inches. 
This is known as the chub sucker, sweet sucker, rounded sucker, creek 
fish and mullet. It hasa wide range, practically including all the waters 
of the United States east of the Rocky mountains. In Pennsylvania it 
inhabits slow muddy streams in all parts of the state, especially the 
eastern. From the other Pennsylvania suckers it may be readily distin- 
guished by the absence of the lateral line. In the South, notably in 
Florida, the variety oblongus, to which the Pennsylvania form belongs, 
is replaced by the variety swcetta, which is a handsomer fish, with larger 
dorsal fin, and beautiful striated scales. The chub sucker grows to a 
