994 The American Naturalist. [November, 
of a new species of Cyprinodontide which is nearly related to the 
Oristias of the elevated Lake Titicaca of Peru, which is the type of a 
new genus called by Professor Gilbert, Empetrichthys. As in the 
Peruvian genus there are no ventral fins and no lateral line, and the 
very large pharyngeal bones are fused below. This fish inhabits the 
inhospitable waters of the Amargosa River, which, while not elevated 
like the Peruvian lake, flows through a region of similar geologic 
age. Another interesting discovery is that of the rare Lepidomeda 
vittata in a stream on the western side of the Colorado drainage 
in Nevada, far from the only locality previously known, which is 
the Colorado Chiquito of Arizona on the eastern drainage. 
In an introduction to the report on insects, Mr. Riley makes the fol- 
lowing remarks: 
“ Taking first the Coleoptera, which represent by far the larger part 
of the collectings, they have for the most part been carefully compared 
with the national collection, and I have had the assistance, in the veri- 
fications, of Mr. M. S. Linell and Mr. E. A. Sehwartz, both well 
acquainted with our North American Coleoptera. As the chief local- 
ities from which the beetles were obtained do not exceed seven, the 
list has been arranged in tabular series to prevent repetition of locali- 
ties. This arrangement at once shows that the collection comprises 
some 258 species, representing 170 genera in 39 families. Of the total 
number of species arranged according to localities, twenty-eight (a) 
are of general distribution in North America, i e, they cross the 
-whole continent, and among them are six cosmopolitan species, while 
only a single species Bradycellus cognatus found in the Argus Moun- 
tains, belongs to the cireumpolar fauna. About fifty of the species 
are widely distributed throughout the more arid regions of the west, 
and about twenty species belong more properly to the fauna of mari- 
time or upper California. The bulk of these species, as will be noted, 
were collected in San Bernardino County. Deducting the three sets 
of species and a few others, e. g., the genera Homalota, Scopzeus, Seym- 
nus and Cryptophagus, of the distribution of which very little can be 
definitely said, there remain about 140 species which are more or less 
characteristic of the Sonoran fauna. Some nineteen species are 
undoubtedly new. i; 
" [In the Heteroptera the list represents merely the species that were 
readily determinable, while the balance, including the more interesting 
forms, have been referred to Mr. P. R. Uhler, of Baltimore, Maryland, 
who has kindly reported on them, with definitions of the new genera 
and species. 
