28 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 59. 



lateral series, 16-17 above lateral line, 41-42 before the dorsal. On 

 comparing the types of -4. generosus and C. plebeius (Baird and 

 Girard) it became evident to the writer that both belonged to a 

 very closely related species, if indeed they were not identical. It 

 now seems probable that the fishes called A. generosus were collected 

 in the Rio Grande basin, perhaps in Utah Creek, along with the 

 trout S. virginalis. 



No question has arisen as to what river system Gila elegans and 

 Ptychocheilus vorax belong. The exact locality of capture is not 

 known, but ample opportunity was offered to fish in the waters of 

 the Colorado from Coochetopa Creek to Green River, and fishes of 

 both species readily take a baited hook. 



Girard does not indicate where specimens of Tigoma egregia were 

 collected. The United States National Museum register records it 

 from Humboldt River, the entry having been made in February, 

 1857, and the type is in all respects like fishes of the species living in 

 that river. The Humboldt was reached June 8, 1855, at a point not 

 far from Imlay, where the river passes through the gap between the 

 Eugene and Humboldt mountains. ''There are no fish in this part 

 of it larger than minnows," writes Lieutenant Beckwith, and those 

 which they apparently caught, Ricliardsonius egregius and SipJta- 

 teles obesus, are the only species there which take the hook readily. 



Algansea obesa was described from two specimens — one collected 

 by J. S. Bowman, the other by Lieutenant Beckwith. Girard was 

 apparently satisfied as to the correctness of the locality assigned to 

 the first, and it (Cat. No. 193 U.S.N.M.) is regarded by the present 

 writer as typical of a Lahontan species, SipJiateles obesus. The 

 second example (Cat. No. 194 U.S.N.M.) apparently belongs to the 

 same species as the first, but it is not given a locality in the museum 

 register. Girard at first refers it to the Humboldt River and later 

 records it as doubtful. 



Tigoma humboldti is included in Girard's general report, but no 

 specimens are there accredited to Beckwith, as in the original descrip- 

 tion. One example (Cat. No. 225 U.S.N.M.) is preserved. The 

 catalogue records two collected by J. S. Bowman. The species 

 represented by the single specimen has not since been found in the 

 Humboldt River. It differs from R. egregius in having 11 rays in the 

 anal fin, a deeper body, larger head, and larger eyes. There are 54 

 scales in the lateral series, 13 above the lateral line, 7 below, and 27 

 between occiput and dorsal fin. 



The type of Tigoma gracilis is lost, the locality unknown, and the 

 description too brief and general to admit of the name being applied 

 without doubt to any particular species. 



It now remains to compare some of the other types with speci- 

 mens which a future collector may be fortunate enough to secure 

 from Cottonwood and Utah creeks near the crossings of the old 

 Sante Fe trail. 



