52 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY—II. 
36. APHODODERUS COOKIANODS, Jordan. 
Proc. Acad. Nat. Sci. Phila. 1877, p. 60. 
Many specimens of this species are in the United States National 
Museum from various points in Illinois. The chief distinctive charac- 
ter of this species, the small size of the scales, seems to be constant. 
Specimens of an Aphododerus, from near New Orleans, the original 
locality of Aphredederus gibbosus Le Sueur, seem to be identical with 
A. sayanus. 
The etymology of “Aphredoderus” is apparently agodos, excrement; 
dspn, neck. The word should therefore be spelled Aphododerus. 
37. ASTERNOTREMIA MESOTREMA, sp. nov. 
General form, appearance, and coloration of Asternotremia isolepis 
Nelson, but the vent not as in the latter species between the anterior 
bases ot the ventral fins, but about an eye’s diameter in front of them: 
Head nearly 3 times in length; depth 34; lateral line, 45 scales. Dor- 
sal III, 8. Anal ITI, 7. 
Type 9296, United States National Museum, from Georgia. Col- 
lector, Hugh M. Neisler; precise locality not indicated. Specimen 24 
inches long, in very bad condition. 
The peculiar position of the vent indicates a direct transition from 
the more generalized type of Asternotremia toward Aphododerus. In 
this species, it is about two-fifths of the distance between its normal 
position in the former genus and that of the latter, farther forward 
than in Asternotremia isolepis. 
Since this paper was in press, I have received two more specimens 
which I refer to this species. They are in much better condition than 
the original types, and from them I am enabled to supplement and cor- 
rect the original description. 
Head 3 in length; depth 34; eye 4 in head; distance to dorsal 24 in 
body ; base of dorsal 4. 
Fin-rays:—). III, 10; A. III, 6; V.7. Scales in 60 to 70 rows, very 
small, and difficult to count. 
Vent in front of the ventrals, about one-third the distance to the lit- 
tle knob at the throat. 
Color precisely like that of the other members of the family. 
Length of specimens 23 and 24 inches respectively. They were taken 
in Little Red River, Arkansas, by Prof. H. S. Reynolds. 
