[33] CATALOGUE OF THE FISHES OF NORTH AMERICA. 



99.— OPSOPCEODUS' Hay. (105,106) 



415. OpsopcBodus emiliae Hay. Vs. (413,414) 



100.— LUXILINUS- Jordan, (gen.nov.). 



416. Luzilinus occidentalis Haird ».t Girard. T. (418) 



101.— NOTEMIGONUS Eafinesqiie. (107) 



417. Notemigouus gardoueus Cuv. & Val. Vse. (415) 



418. Notemigonus chrysoleucus ^ Mitchill, Vn. (417) 

 418 b. Notemigonus rhri/solcticus hosci Cn\. & Yiil. Vse. (419) 



102.— RICHARDSONIUS Girard. (108) 



419. Richardsoniusbalteatus Richardson. T. (421) 



420. Richardsonius lateralis Girard. T. (422) 



103 — LEPIDOMEDA Cope. (109) 



421. Lepidotaeda vittata Cope. R. (423) 



422. Lepidomeda jarrovil Cope. R. (424) 



104.— MEDA ^ Girard. (110, 111) 



423. Meda fulgida Girard. R. (42.')) 



424. Meda argentissima Cope. R. (426) 



4^. D. 1, 8; A. 1, 8. Scales, 11-55-5. Teeth, 5-5, with well developed grinding sur- 

 face. L., 3 inches. Pyramid Lake, Nevada. (Cope, Proc. Ac. Nat. Sci. Phila., 1883. 

 140.) 



'The genus Trycherodon should be suppressed, its typical species, T. megalops, heAng 

 identical with Opsopoeodua emilice. 



2 LuxiLLNUS Jordan. 



(Genus nova : type Lujcilus occidentalis B. and G.) Ventral edge of moderate width ; 

 .scaled over and not at all carinated; otherwise essentially as in Notemigonus. Gill 

 rakers slender, of moderate length. Teeth 5-5 with entire edges and well developed 

 grinding surface, their tips little hooked. Intestines of the short type, but longer 

 than in most related genera. Anal basis elongate. (Name, a diminutive oi Luxilus ; 

 from lux, light.) 



3 Specimens from Virginia, South Carolina, Georgia, and Florida (var. hosci) have 

 43 to 50 scales in the lateral line, an«l 15 to 17 rays in the anal fin. Specimens from 

 various northern and western localities. Nova Scotia to Maryland, Louisiana, and 

 Dakota (var. chrysoleucus) have 46 to 51 scales in the lateral line, and 12 to 14 anal 

 Tays. I regard the two forms as geograi)hical varieties of one species. The name 

 •Cyprinus americanus is i)reoccupied, having been first given to a Menticirrits. 



*'£he types of Meda fulgida, lately found by me, have the teeth 2, 5-5, 2, not 1,4-4, 

 1, as stated by Girard. The genus Meda is therefore identical with Plagopterus. The 

 small barbel mentioned by Cope as a character of Plagopterus, I am unable to find 

 either in Meda or Plagopterus. 



Meda fulgida is closely allied to Meda argentissima, but has the eye a little larger, 

 the snout shorter, the lower jaw more prominent. In form, size, coloration, and fiu 

 rays the two agree fully. 



