Cockerell- Some Notes on Fish Scales. 213 



CYPkiMD.i:. 



The following interesting species arc described from the collection of 

 the Bureau of Fisheries at Washington and {Algansea and Lepidomeda) 



the National Museum : 



(1.) Algansea sallaei (Giinther). Scales oblong-, subquadrate, nearly 

 parallel-sided, slightly over 2 nun. long, about 1| wide; nucleus 

 subbasal; radii all around; apical radii about 10 or 12, the inter- 

 radial circuli very widely spaced. This is one of the few American 

 Cyprinids having basal radii; the scales are not unlike those of 

 Temeculina. The fish is from Guanajuato, Mexico (A. Duges). 



(•_'.) Mylocheihts caurinus (Richardson). Snake River, Idaho (Ever- 

 mann). Large scales, about b% mm - l° n g an ^ 5 broad; nucleus 

 subbasal; no basal radii; apical radii about 25 or more; apical 

 circuli widely spaced, not at all angulate in middle; very obtuse 

 hiterobasal angles. Except for the non-angulate apical circuli, this 

 reminds one of Semotilus. 



(3. ) Richardsonius siuslawi (Evermann&Meek). Siuslaw River, Oregon 

 (S. E. Meek). Scales quite normal for the typical subgenus Rich- 

 ardsonius ; apical radii about 18, some imperfect. 



(4.) Exoglossum maxillingua (Le Sueur). Roanoke, Ya. Scales about 

 2% to 2% mm. long and broad; nucleus subbasal; no basal radii; 

 apical radii about 20; apical circuli widely spaced, not angled; 

 laterobasal angles evident but obtuse. The structure is almost as 

 in Mylocheilus. 



(•">.) Lepidomeda vittata Cope. Colorado Chiquito River. Transversely 

 oval scales, with the usual subbasal nucleus; apical radii about 7, 

 strong; no basal radii; apical circuli extremely widely spaced. 

 These scales are quite different from those of Gila, a fact useful for 

 the separation of the fishes from juvenile Gila, occurring in the 

 same region. 



