NOTES ON FISHES OF THE GENERA AGOSIA, ALGANSEA, AND 
ZOPHENDUM. 
r BY\ 
I David Starr Jordan, 
\ President of Indiana University. 
The genus Zophendum Jordan (Bull. Hayden's Geol. Surv. of Terr, iv, 
786,1878) has been defined in the Synopsis Fish N. A. as being anear rela- 
tive of Uybognathus, from which it differs chiefly in the small size of the 
scales. These generic characters are well shown in Zophendum australe 
Jordan, and in an undescribed species also from Guanajuato. An ex- 
amination of the specimens figured by Girard, of Leuciscus tincellus 
Guv. & Vai., from the City of Mexico, shows that this species agrees 
substantially in dentition, intestines, and other characters, notably in 
the breadth of the suborbital bones, with Zophendum australe. But 
this species is the original type of the earlier genus Algansea Girard. 
The name Algansea therefore should be used instead of Zophendum for 
australis, tincella and their congeners. This leaves the group called 
Myloleucus Cope {obesus, symmetricus, bicolor, etc.,) to retain the name 
Myloleucus, unless they be referred to the European genus Leucos. 
But the original type of Zophendum was Uybognathus (misprinted Hy- 
borhynchus) siderius Cope. An examination of Professor Cope's original 
types shows that it has no affinity with the other species called Zophen- 
dum. Zophendum siderium has a distinct barbel at the angle of the 
mouth. Its teeth are 4-4, hooked, with a rather broad grinding sur- 
face, and its intestines are moderately elongate, the peritoneum some- 
what dusky. It is, in fact, identical with the species described by 
Girard as Agosia chrysogaster. I have compared Cope's types with 
specimens of the latter from Bio Sonora, Magdalena, Mexico. Zophen- 
dum, as originally defined, is therefore a synonym of Agosia. 
Very close to Agosia is the group called Apocope. This differs in its 
thicker lips, and in having the teeth mostly 1, 4-4, 1, strongly hooked, 
and without grinding surface. This is probably a valid genus, al- 
though very close to Rhinichthys on the one hand and Agosia on the 
other. The fins are considerably higher in Agosia, and the intestines 
are full of vegetable matter. 
Proceedings National Museum, Vol. XIII.-No. 822. 
287 288 
NOTES ON FISHES JORDAN. 
The species concerned in this discussion maybe arranged as follows : 
Genus Agosia Girard=Z0PHENDUM Jordan. 
Agosia chrysogaster Girard=Hyborhynchii8 siderius Cope. 
Genus Algansea Girard=ZoPHENDUM, not type. 
Algansea tincella (Cuv. & Vai). Algansea australis (Jordan). 
Genus Myloleucus Cope. 
Myloleucus obesus (Girard), etc. 
Indiana University, April 10, 1390.