126 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. [1885. 



Name. 



Moniana gibbosa 



Monianatristis 



* Eichaidsonius lateralis 



*Lnxilu8 0cci(lentali8, (B. &G.)' 



* Luxilus leptosomus - 



Luxilus seco -^ 



t Luxihis lucidns'* 



* Semotilus macrocephalus 



* Semotilus speciosus 



t Tiaroga cobitis "■' 



Gila (species) ^' 



Tigouia (species) "^ 



Cbeouda (species)*^ 



Identification. 



Notropislutrensis, (B. & G.). 

 Notropis sp. 



Eicbardsouius lateralis, (Grd.). 

 Luxiliuus occideutalis, (B. &G.). 

 Noteuiigouus cbrysoleiicus. 

 Notemigonus ? cbrysoleiicus. 

 Notropis umbratilis, (Grd.). 

 Semotilus atromaculatus, (Mitcb. ). 

 Semotilus atromaculatus, (Mitcb.). 

 Tiaroga cobitis, (Grd.). 

 Gila (species). 

 Squalius (species). 

 Squalius (species). 



Eye 3i in bead, sligbtly longer tbau snout. Snout formed as in X. hdrensis; tbe moutb 

 oblique. Maxillary 3i in bead, reacbiug past front of orbit. Form fairly represented 

 in Girard's figure, but tbe caudal peduncle ratber more attenuate. 



Some blackisb dots along tbe posterior margin of each scale ; a dusky band mixed 

 witb silvery along sides. A brownish spot as large as pupil on base of caudal. 

 Teeth 4-4. 



^Luxilinus, Jordan; type Ltixilinus occidentalli, B. & G. This genus is allied to 

 Notemigonus, difiering in having the belly nowhere carinated, the ventral line behind 

 ventral fins being covered witb ordinary imbricated scales. Teeth .5-5, with entire 

 edges and strong grinding surface. Gill-rakers slender, of moderate length. Intes- 

 tine short, but more elongate than in Xotropis. 



-The type oi Luxihis leptosomus is in bad condition. It is not evidently different 

 from Notemigonus chrysoleucus. 



^The type of Luxihis seco (in tbe Academy at Philadelphia) is a young Notemigonus 

 not evidently difi'erent from N. chrysoleucus. It has A. 13 or 14 ; lat. 1. 55 ; teeth 5-5 

 mouth very small ; lateral line decurved; a dusky spot at base of caudal. 



"•Two specimens (5(i S. I., 3^ inches long) of Luxihis lucidus, Girard, are in tbe muse- 

 um of the Academy. Head 4 ; depth 3|. D. 8;A. 11. Scales 7-40-3 ; 25 scales before 

 dorsal. Teeth 2, 4-4,2, with oblique grinding surface. Ventral line covered with 

 scales. Eye = snout, 3f in head. Insertion of dorsal midway between base of cau- 

 dal, a point just behind tip of snout. Lateral line decurved. Scales before dorsal 

 much crowded.. Mouth oblique, the maxillary reaching front of orbit, 3^ in bead. 

 Base of anal 1^ in head. (Meek.) 



This species is apparently identical with Notro2yis umhraVilis, described from tbe 

 same region. 



* A type of Tiaroga cohiiis, in the Philadelphia Academy, has been examined by me. 

 The genus is evidently a valid one, and very distinct from Notrojns, approaching 

 most nearly to Ehinichthys. The following are my notes on tbe s])ecimen examined: 



Body decidedly elongate, loach-like, snbfiisiform, little compressed, covered with 

 minute scales. Head small, subconjcal, depressed. Moutb very small, terminal, 

 oblique, without barbels, the maxillary 4 in bead, not reaching nearly to eye. Pre- 

 maxillary not protractile. Lips fleshy. Lower jaw included. Eye moderate, placed 

 high, nearly midway in bead, its length 3| in head. Isthmus very wide. Ventrals 

 sligbtly in advance of dorsal. Fins all high, tbe first (rudimentary) ray of dorsal 

 somewhat enlarged. Pectorals reaching ventrals ; ventrals past front of anal. Head 

 4f in length : depth 6. D. 8, A. 7. Lat. 1. 60 to 70 (not to be counted exactly). Teeth 

 apparently 1, 4-4, 1, extremely small, apparently without grinding surface. 



•^I here omit all reference to the species of Gila, '^ Tigoma," and '^ Cheonda," not 

 having yet re-examined Girard's types, and having therefore nothing to add to the 

 account given in the Synopsis. 



