UMBRID&. ‘ 53 
The species of this family now known are the following, beginning 
with the form least specialized :— 
1. Asternotremia isolepis Nelson.—Ilinois, both in tributaries of Lake 
Michigan and of the Ohio and Mississippi. 
2. Asternotremia mesotrema Jordan.—Georgia to Arkansas. 
3. Aphododerus cookianus Jordan.—Wabash Valley ; at various points 
both in Indiana and Illinois. Many specimens in United States National 
Museum. 
4, Aphododerus sayanus (Gilliams) De Kay.—Streams coastwise, New 
York, New Jersey, south to Louisiana. 
UMBRIDAE 
38. UMBRA PYGMABDA, (De Kay) Bean, MSS. 
Leuciscus pygmeus, DE Kay, Fishes N. Y. 214.—SrorEr, Synopsis, 414. 
Melanura pygmea, BairD, Ninth Smithsonian Rept. 1855. 
Fundulus fuscus, AYRES, Bost. Journ. Nat. Hist. iv, 296.—SToRER, 1. ¢. 431. 
Umbra or Melanura limi, part, various authors (all. quotations from Southern New 
York and streams of the Atlantic coast). 
My friend Dr. T. OH. Bean, of the Smithsonian Institution, calls my 
attention tothe fact that the Mud Minnow of our eastern streams is 
quite a different species from the Umbra or Melanura limi, with which 
it has thus far been confounded by all writers who were aware of the 
relations of the fish. The synonymy of M. pygmaa is given above. 
Its characters are as follows :— 
Head about 4 in length; depth 43; body more terete and less com- 
pressed than in M. limi; head broader, less depressed, with larger eye ; 
interorbital space more convex; snout shorter, profile more gibbous. 
Dorsal 13; anal 7 (dorsal 14, anal 8 in M. limi). Lateral line 35. 
Coloration :—dark brown, a series of whitish lengthwise stripes along 
the rows of scales; a black bar at base of caudal; no traces of verti- 
cal bars; blackish bands forward, downward, and backward from eye; 
a dark vertebral band. J/. limi is more mottled, not striped, and always 
' shows pale vertical cross-bars. Specimens examined from Tarboro’, 
N.C., and from points in New Jersey and New York. The smaller 
Se of branchiostegals (four instead of five or six) is the only char- 
acter known to separate Melanura from Umbra. 
