438 FISHES FROM THE MAUMEE VALLEY, OHIO. 



21. Semotilus atromaculatus (Mitchill). (U. S. Nat. Mus., Cat, No. 40091.) 



Chub; Horned Dace 



M..L.,C, G., P. Abundant. 



22. Opsopoeodus emiliae Hay. 



Length of specimens, 2£ inches; head, 4£ in the length of the body; 

 depth, 4.\. Dorsal, one short and nine long rays; anal, 1-8; scales, 40 

 iu the lateral line. 



Body elongate, not much compressed, rather robust anteriorly ; cau- 

 dal peduncle slender. 



Snout blnutish; mouth very small and very oblique, its gape making 

 an angle of at least 60° with the axis of the body. Lips very thin; 

 chin convex and projecting beyond margin of the upper lip when the 

 mouth is closed. Eye moderate; its diameter 3^ in length of head. 

 Length of snout, four-fifths diameter of the eye, end of the maxillary 

 reaching about two-thirds to vertical from anterior margin of the 

 orbit. 



Origin of first dorsal ray nearer tip of snout than base of caudal fin 

 by about diameter of the eye; first dorsal ray about one-half length 

 third dorsal ray; second about three-fourths the length of the third. 

 Length of longest dorsal ray, four-fifths length of the head, its tip 

 reaching beyond tip of last ray when the fin is deflexed. Anal similar, 

 but smaller. Tips of pectoral fins reaching two-thirds distance to base 

 of veutrals; ventrals reaching vent, which is midway between base of 

 pectoral aud base of caudal fin. Caudal fin forked; outer rays more 

 than twice length of inner rays. 



Scales before dorsal fin not crowded, 16 in a series. 



Teeth, 5-5, slightly hooked at tips, and with grinding surface and 

 slightly crenated edges. Lateral line incomplete. 



Straw-colored, with top of head black. The first five dorsal rays 

 (including short one) black, next two rays white, and the last three 

 black. All the other fins plain, with no dark markings. 



The above description is taken from two specimens from Maumee 

 River. 



Dr. D. S. Jordan has compared these two specimens with the types 

 of 0. emiliWj types of Trychcerodon megalops Forbes, and with specimens 

 from New Harmony, Jnd., and furnishes me with the following notes: 

 "The two specimens (Maumee) are larger and brighter in color than 

 types of 0. emiliiv; they are more compressed, brighter, aud with 

 slightly larger eye than T. megalops; they are also larger and have 

 more black on the dorsal than the New Harmony specimens. All, 

 however, seem to belong to one species." 



23. Notemigonus chrysoleucus (Mitchill). (U. S. Nat. Mus., Cat. No. 40100.) 

 M., P. Xot abundant. 



