Cope.] "* 't) [June , 



of Maryland and Delaware, and is but little valued for market. It is no 

 doubt the species described first by Lesueur, as it is the only one of the 

 genus seen in the Philadelphia market. I did not meet with it in jSTorth 

 Carolina. 



PtycTiostomus duquesnei, Lesueur. 



A specimen of this fish from near Pittsburg, Lesueur' s original locality 

 suggests the correctness of the opinion of Rafinesque, that his Pt. eryth- 

 rurus is a different species. The characters are seen in the 10 ventral 

 radii, and the considerably more prominent muzzle, with correspondingly 

 inferior mouth. The scales are also smaller 7 — 48 — 7, (to front of ven- 

 tral). Dorsal fin little incised above, R. XIII. Length of head 4.6 in 

 that of head and body ; orbit four times in head 1.75 times in interorbital 

 sjoace. Cranial crests moderate, the parietal region elevated as in PL 

 inacrolepidotus, not so plane as in Pt. erythriirus. Depth 3| in length. 

 Lips moderately developed. Dentition as in P^. erytJirurus. The coloration 

 in spirits is quite like that of other species, except that the dorsal region 

 is a dark steel bluish, which the other species do not exhibit. Scales 

 ■without black spot at base. 



Length of a moderate specimen from the Youghiogheuy River, Penn- 

 sylvania, one foot. 



Kirtland's description in Proc. Boston Sci. Nat. Hist. V 268, leaves it 

 somewhat uncertain as to whether this species or the Pt. erythrurus was 

 before him ; his figures resembles the present flsh. I should not be sur- 

 prised to find that his female "red-horse " described as so different from 

 the male, was our Pt. coHapsus. 



PtycJiostomus carpio, C. V. 

 This species differs from its near allies in the more numerous dorsal radii, 

 etc. The form appears to be that of Pt. erythrvyrus. Its habitat is given 

 by the French authors, as Lake Superior, and Giinther adds St. Lawrence 

 River and Lake Erie. I have not seen it. The lip characters separate it 

 from Pt. velatus. 



Ptycliostomus, oneida. Dekay. 



Geological survey. New York, III, 189. 



This species is also similar in general prop Drtions to the Pi. erythriLmx, 

 but has, according to Dekay, more numerous scales and a much smaller 

 eye. Dekay says : seventeen longitudinal rows of scales counted at dorsal 

 fin. Head and body 10 in. ; tail 2.; head 2.5 (one-fourth) ; eye., 4 inch 

 (one-sixth head). Radi D. XIII ; V. 9. He does not describe the lips. 



Oneida Lake. 



Ptychostomus aureolus. Les. 



Agass. 1. c. 89. Catostomus aureolus. Lesueur J. A. N. Sci. Phila. I, 

 95 Tab. 



With this species we enter a series characterized by the relatively small 

 size the head bears to the body, and consequent apparent elevation of the 

 latter. The head enters the length exclusive ot the caudal fin, five times. 



