NOTES ON FISHES COLLECTED IN MEXICO BY PROF. AI.FREDO 
DUGES, WITH DESCRIPTIONS OF NEW SPECIES. 
BY 
TarLeTon H. Bean, M. D., 
Tchthyologist of the United States lish Commission. 
(With Plate xiv.) 
The U.S. National Museum received from Prof. A. Dugés, August 
24,1891, a small but very interesting collection of fishes, including 
three species which appear to be new to science, and which are described 
in the following paper. Among these fishes are two examples of Lam- 
petra spadicea of much larger size than any previously obtained, and 
which show some very interesting variations from the types. The 
species of Acara trom the region Huazteca Potosina, in the province of 
San Luis Potosi, Mexico, is interesting because it appears to be the 
first one of its group from the locality. It is rather curious that the 
name Mojarra should be held in common by this fish and the species ot 
- Gerres. 
Lampetra spadicea Bean. 
Two examples, 104 and 105 inches long, Catalogue No. 43766, Col- 
lector’s No. 177; from Tanganzicuaro. 
The length of the head is one-eighth of the total, and the diameter of 
the eye is contained four and two-third times in the length of the 
snout. In the longer individual the maxillary tooth has two minute 
cusps between the large ones, but neither of these is median. The 
mandibulary plate has nine cusps, of which five are larger than the 
intervening ones. The teeth around the margin of the disk are reduced 
to two rows posteriorly. In the shorter example, which has more of a 
bluish tint overlying the chestnut of the upper parts, the maxillary 
tooth has one minute supplementary cusp, not median in position. 
The mandibulary plate has nine cusps, as in the larger individual. 
Algansea dugési, new species. (Plate xiv, fig. 1.) 
This species is related to A. australe Jordan, from which it differs in 
its much smaller scales. 
The types of the species are catalogue Nos. 41818 and 43764, U.S. 
National Museunt, They were collected by Prof. A. Dugeés, of Guana- 
Rroceedings National Museum, Vol. XV-—No. 905. 
283 
