CALL FISHES OF THE OZARK REGION. 75 



tribution — e. g., Etheostoma cmruleum spectabile — the very great varia- 

 tions which it presents are those of form and size, rather than of colora- 

 tion. The differences between the sexes are marked, and especially so 

 are those between the young and old males. Drs. Jordan and Gilbert 

 have called attention to these features in their admirable "Synopsis of 

 the Fishes of North America." * This species was, with the possible 

 exception of the following form, the most abundant fish with which 

 we met. 



6. Chrosomus erythrogaster, Rafinesque. (202.) 



West Fork Black River and Tom's Creek, Reynolds County; Sink- 

 ing Creek, Spring Valley Creek, and Jack's Fork, Shannon County. 

 In the smaller brooks and streams this beautiful cyprinoid was espe- 

 cially abundant. The very brilliant hues so characteristic of the species 

 varied from pure white, on the ventral aspect, through all shades of 

 coloration to bright yellow, orange, and red. In one locality particu- 

 larly, in a mere rill tributary to Sinking Creek, the seine when landed 

 presented a leaping mass of almost indescribable beauty of coloration. 

 Hundreds of this richly-colored dace were taken at this locality — the 

 richest found during the period of exploration. The males appear to 

 be in the excess in point of numbers. 



7. Dionda nubila, Forbes. (212. ) 



Tom's Creek, Reynolds County, and Piney River. Texas County. 

 This form was described as Alburnops nubilus, from the Rock River, 

 Illinois. It was placed in Clio/a by Jordan and Gilbert in their "Syn- 

 opsis," and finally, for reasons stated by Jordan in "Catalogue," p. 21, 

 note 1, placed in Dionda. The genus, as now limited, "is character- 

 istic of the Rio Grande region." The species is the most northerly one 

 of the group. It was rare in our collections in Missouri. 



8. Hybognathus meeki ? Jordan and Gilbert. (214.) 



Several specimens from the West Fork of Black River, Reynolds 

 County, and Jack's Fork, Shannon County, appear to be this species. 

 It is not an abundant form in this locality, and does not appear in 

 the collections made at any other points. It is said by the discov- 

 erers to be "abundant in the Ozark region of Missouri and Arkansas." 

 From this circumstance our identification may be erroneous. 



9. Hybognathus nuchalis, Agassiz. (216.) 



Piney River, Texas County, and Meramec River, Dent County. 

 Two specimens only were taken. 



♦Bulletin U. S. Nat. Museum, XVI., 1SS2. 



