392 



SYNOPSIS OF THE CYPRINIDvE OF PENNSYLVANIA. 



in same, Inferior border operculum straight, one-fourth longer than posterior. Longitudinal rows of scales '2:;, 

 transverse 75 — 8, concentric ridges stronger. Fins all quite short, rays D. 1. 8. C. 18. A. 1. 8, V. 8, 1*. Ml. 

 Dorsal outline nearly straight, front very gradually descending. 



Specimens taken in the beginning of autumn were yellowish silvery below, as far as a dark band in the usual 

 position of the lateral line; the latter commences at end of muzzle, and is much deeurved on thoracic region. A 

 narrower dark line on the upper lateral region confluent with the lower on caudal peduncle. Above lower band 

 brownish interline with small brown spots. 



Total length 2.312 in.; end muzzle to origin dorsal one in.; latter to origin caudal .81. 



I have seen four specimens of this species from tlie Meshopen Creek, Susquehanna 

 County, Pa., a tributary of the River Susquehanna. 



ITYBOPdlYNCIIUS, Agassiz. 



Am. Journ. Sci. Arts, 1855, 222. 



The separation of the first bony dorsal ray is the most prominent feature in this genus, 

 as I have pointed out, Proc. Acad., 1864, 283. The pharyngeal teeth are arranged 4 — 4, 

 and often a little hooked; they much resemble those of some species of Ilybopsis. The 

 parietal region is flat, and the temporal abruptly angulated, as mentioned by Agassiz, but 

 this occurs in almost as great a degree in some Hybopses. Tin; genus most nearly allied 

 is Pimephales ; it agrees with it in the development of the frontal tubercles of the male 

 taking place across the muzzle only, and in the increased length of the alimentary canal. 

 In H. notatus the intestine presents five flexures ; in P. promelas there are seven, and the 

 length is two and two-thirds that of the head and body. 



The figures given by Girard of the species he has described under this genus, do not 

 present the peculiarity of the dorsal fin, and are either erroneous or the species do not 

 belong to the genus. 



HYBORH-YNCHUS NOTATUS, Bafinesque. 



Agassiz, 1. c. Minnilus notatus. Raf, Ichth. Ohiensis, 47. 



In Pennsylvania this species occurs only, so far as my observations have extended, in 

 tributaries of the Ohio. I have seen it from Michigan, while Prof. Agassiz records a 

 range of nearly all the tributaries of the Mississippi and Lakes, with Lake Champlain, and 

 the Mohawk. 



