EXPLORATIONS OF THE ALLEGHANY REGION AND WESTERN INDIANA. 109 
Balcony Falls. It was in earlier times converted into a canal by an elaborate system 
of dams and locks. Our collections were made at a point a few rods above the wagon 
bridge at Loch Laird. The dam below this point is now broken through. The stream 
is shallow and rather swift, running over gravelly bottom. The banks are covered 
with willows, and along the shore is a thick growth of EuelUa. Not much time was 
spent here, and the space lit for seining which can be worked is small. Species taken 
in the North Eiver are marked N. 
6. Swift CreeJc, about 5 miles north of Petersburgh, Va. Collections made Sep- 
tember 6. The collections in this stream were luade during a heavy rain and 
under unfavorable circumstances. Immediately below the dam in Swift Creek the 
stream is very rocky ; lower, its current is less rapid, with deep holes here and there. 
Although this stream is one of the tributaries of the lower course of the James, its 
fauna is essentially that of the upland streams. The noteworthy difference consists 
in the presence of the shad, rocktish, gizzard shad, and pike. The shad and rocktish 
come up the stream to spawn in spring and the young remain in the stream through 
the summer. In the lowland course the large-mouthed black bass takes the place of 
its more active congener. The species from Swift Creek are marked S. 
1. Ameiurus albidus (Le Sueur). N., L. “Channel Cat.” 
Not rare. A. 21, 23. Color rather dark in young specimens. 
2. Ameiurus nebulosus (Le Sueur). B., N. 
Not rare, in sluggish places in the larger streams. 
3. Noturus insignis (Richardson). B. “Mad-Tom.” 
Not rare in weedy places. 
4. Catostomus teres (Mitchill). B., L., E. 
Common in sluggish waters. 
5. Catostomus nigricans (Le Sueur). B., L., N., E. 
Common in swift waters. 
6. Moscostoma cervinum (Cope). B., E. 
Very common in swift waters, especially in water-falls and in the pools at the foot 
of dams. 
Young specimens in life have the back dark brown, mottled with black blotches 
which extend on the sides; side with a well-defined coppery band, broader than the 
eye; belly below this band abruptly silvery, a blackish blotch on tail before base of 
caudal; base of caudal pale orange ; caudal dull orauge, the membranes black ; nos- 
tril and edge of opercle pale orange. Older specimens lose the orange lateral band, 
and in still older ones light stripes follow the rows of scales on the back. 
This little sucker is too small to be of much economic value. It rarely exceeds 8 
to 10 inches in length. 
7. Hybognathus nuchalis Agassiz. L. 
Scarce in the river channels. 
8. Exoglossum maxillingua (Le Sueur). C., B., N. “Nigger-Dick.” 
, Very common, though not in cold nor very swift water. A rather sluggish spe- 
cies, living on the bottom. 
