aS £ 2% 
CE or 
286 / NOTES ON MEXICAN FISHES—BEAN, 
In radial formula and number of seales this species is apparently 
nearest to FY. labialis Gthr., but in labialis the height of the body at the 
base of the pectoral is contained four and one-half times in the length 
without caudal, while in the species here described it is contained 
three times. In /. labialis the head forms one-fourth or less than one- 
fourth of the total without caudal, while in this species it is fully one- 
third of this length. 
Additional examples of this species were obtained by Prof. Dugeés, 
being number 37834 U.S. National Museum, a single specimen 5 inches 
long; and number 41973, five examples, the largest 4 inches long and 
the smallest 25inches. In these five specimens the differences separat- 
ing F. robustus from F. labialis Gthr. are found to be constant. 
Characodon variatus Bean. } 
A single specimen, No, 43761 U. 8. National Museum, collector’s No. 
184, 22 inches long; was collected by Prof. Dugeés in the State of Guana- 
juato. With the aid of the numerous additional specimens collected by 
this gentleman since my description of Characodon variatus and ferrugi- 
neus was published (Proc. U. 8. Nat. Mus., 1887, pp. 370-372), I am led 
to believe that these two species are identical. The sexual differ- 
ences are very striking. On Plate xx of the volume just mentioned is 
a female, and fig.4 the male. In a large series of this species, No. 41813, 
containing many females, this sex is found to have a narrow dark band 
along the side usually well developed, and a very distinct broad dark —— 
band occupying the middle of the caudal fin, the base and the tip being — 
pale. The dorsal in this sex is bluish, except that there is a narrow | 
pale margin along the top. j 
It should be stated, also, that my previus opinion as to the identity of —— 
Goodea and Characodon is erroneous, the characters assigned to Goodea 
justifying its separation as a distinct genus. | 
Acara bartoni, new species. (Plate XLrv, fig. 3.) 
The description is based upon four specimens, catalogue number 43765, | 
U.S. National Museum, which were collected in Hauzteca Potosina, a 
region situated north of the State of Guanajuato, in the State of San 
Luis Potosi, Mexico. Prof. Dugés thinks this region probably extends 
eastward to the Hauzteca Grande, in the States of Tamaulipas and Vera 
Cruz. The common name in the region is Mojarra. 
All of the specimens have been eviscerated and have had their gills 
removed, but as no better individuals are available they must serve for 
the purposes of this description. The largest example is 7 inches long 
and the smallest 34 inches. 
The greatest height of the body is contained two and a third times 
in the length without the caudal. The two larger examples have the 
nape strongly arched. The diameter of the eye is contained from four 
and a half to five and a half times in the length of the head or twice in 
