JORDAN ON FISHES FROM THE RIO GRANDE. 401 



Giinthei's account, especially iu regard to the position of the dorsal. 

 There seem to be eleven rays in the anal. The number of branchioste- 

 gals is apparently six-; the species is therefore a Hydrargijra, and not a 

 Fundulus, as those genera are now understood. 



Family CYPRINID^. 



Genus CAMPOSTOMA Agassiz. 



5. — CAMPOSTOMA POEMOSULUM Girard. 



1856— Campostomaformosulum Girard, Proc. Ac. Nat. Sc. Phila. 176. 



Campostoma fwmosulum Girard (1859), U. S. Mes. Bound. Sur. Ichthyo]. 41, pi. 25, 



f.5-8. 

 Campostoma formosuhim Jordan &. Copelamd (1876), Check List, 146. 



A single specimen of a Campostoma, with a rather long and pointed 

 head. Its scales are rather large, 51 in the lateral line. It agrees well 

 with Girard's figure and description, but the points of distinction be 

 tween the species and the common C. anomalum are not evident. 



Genus HYBOGNATHUS Agassiz. 



(Hyiognathus, Alfjoma, and Dionda Girard.) 



C— Hybognathus AMARUS (Girard) Jordan. 



1856 — Algoma amara Girakd, Proc. Ac. Nat. Sc. Phila. 181. 



Algoma amara Girakd (1859), U. S. and Mex. Bound. Surv. Ichthyol. 45, pi. 27, f. 



17-20. 

 Algoma amara Jordan & Copeland (1876), Check List, 150. 



Several specimens of a small, pale, large-scaled species of Hybognathus, 

 very similar to H. nuchalis Ag., and agreeing well with Girard's figure 

 and description. Lateral line 36 to 38. The genera Algoma and Dionda 

 do not differ in any tangible respect from Hyhognathus^ and, until some 

 good distinctive character is found, should be reunited with it. The 

 species of Dionda and Algoma are generally small and thick-bodied, and 

 Girard's typical series of teeth, preserved in the National Museum, 

 show the teeth of Dionda as generally shorter proportionally than tho se 

 of Hybognathus. In this respect, as well as in the form of the body, 

 Algoma is intermediate. 



7. — Hybognathus serenus (Girard) Jordan. 



1856 — 7Jio»<?a sereHa Girard, Proc. Ac. Nat. Sc. Phila. 177, 



Dionda serena Gerard (1859), U. S. Mex. Bound. Surv. Ich. 42, pi. 23, f. 9-12.. 



Dionda serena Jordan & Copeland (1876), Check List, 147. 

 .1856— Dionda texensis Girard, Proc. Ac. Nat. Sc. Phila. 177. 



Dionda texensis Gikard (1859), U. S. Mes. Bound. Surv. Ich. 42, pi. 2G, f, 21-24. 



Dionda texensis Jordan & Copeland (1876), Check List, 147. 



