240 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
VIII.— THE MAQUOKETA RIVER. 
The Maquoketa Biver lies north and east of the Wapsipinicon. It is somewhat 
smaller than the latter, but has about the same physical characteristics. We visited 
the North Fork near Worthington and the South Fork near Manchester andHopkinton. 
The bottom in both was sandy, with very little mud. 
Spring Branch, near Manchester, is a small spring brook, the temperature of 
which is said not to exceed 60° F. Many brook trout are caught in it every year. 
Spring Creek at Delhi is a small brook of no special importance. It becomes 
nearly dry in summer and has a very muddy bottom. 
FISHES OF THE MAQUOKETA RIVER. 
1. Ameiurus melas (Rafinesque). Bullhead. Worthington and Manchester, not common. 
2. Catostomus teres (Mitchill). Common sucker. Hopkinton and Worthington, rare; Delhi and 
Manchester, common. 
3. Catostomus nigricans Le Sueur. Hog sucker ; Stone-roller ; Hog mullet. Hopkinton, not common ; 
Manchester, common. 
4. Moxostoma duquesnei (Le Sueur). Common redhorse; “Mullet.” Hopkinton, not common; 
Worthington, common; Manchester, abundant. 
5. Campostoma anomalum (Rafinesque). Stone-lugger; Stone-roller. Hopkinton, rare; scales, 50. 
Delhi and Worthington, not common; Manchester, rare. 
6. Chrosomus erythrogaster Rafinesque. Bed-bellied minnow. Worthington, rare ; Delhi, very 
common ; Manchester (Spring Branch), common. 
7. Hybognathus nuchalis Agassiz. Silvery minnow. Delhi, common. 
8. Pimephales promelas Rafinesque. Fat-head. Hopkinton, abundant; Worthington, common; 
Delhi, not common; Manchester, common in small bayou near Spring Branch. 
9. Pimephales notatus (Rafinesque). Blunt-nosed minnow. Hopkinton and Worthington, rare; 
Delhi, not common ; Manchester, rare. 
10. Notropis heterodon (Cope). Manchester, rare. 
11. Notropis cayuga Meek. Hopkinton, rare. 
12. Notropis deliciosus (Girard). Worthington, abundant; eye large, 3 to 3J in head; snout very 
short and blunt. Manchester and Hopkinton, rare. 
13. Notropis gilberti Jordan and Meek. Hopkinton, abundant; Worthington, not common; Delhi 
and Manchester, common. 
14. Notropis whipplei (Girard). Hopkinton, rare; Manchester, common. 
15. Notropis megalops (Rafinesque). Common shiner. Hopkinton, not common; Worthington, com- 
mon; scales before dorsal small. Delhi and Manchester, common. 
16. Notropis ardens (Cope). Redfin. Hopkinton, not common ; dorsal fin tipped with red, all other 
fins red, red on opercle region; body bluish, tinted with red. Worthington, rare. Delhi, 
rare; length, 2J- inches ; scales, from 45 to 54; about 30 scales before the dorsal; anal rays, 11; 
dorsal, 8; head, 4^; depth, 4 to 4j. This species seems exceedingly variable and is nowhere 
abundant. Manchester, rare. 
17. Notropis dilectus (Girard). Emerald minnow. Hopkinton, common; Worthington, abundant: 
18 to 22 scales before dorsal. In some specimens, the scales nearest the nape are smaller 
than those on other parts of the body. Scales, 40; anal rays, 10-11, usually 10, sometimes 9 ; 
plumbeous band very distinct ; head, 4 to ; depth, 5f ; eye, 3§-. There are probably included 
under this name more than one species from Iowa. A careful study of more specimens than 
I have at present is needed to determine this fact. 
