62 



19. Hadroptertcs x>hoxocephalus , Nelson. 



(Bui. II, 39; Alvordius phoxocephalus : Synop., 501; do.) 



This species, described from specimens taken in Central Illinois, has not 

 yet been found in the northern part of the State, althoug^h it is decidedly 

 common from the Illinois river southward, including the Wabash Valley. It 

 occurs in our collections only from the largrer streams; such as the Fox, 

 Illinois, Saline, and Little Wabash r'vers, and Mackinaw creek. 



Genus 10. Percina, Haldeman. 

 Log Perches. 



20. Percina caprodes,Rsii. — Log Perch; Rock-fish; Hog-molly; Hogfish. 



(Bui. II, 39; Percina caprodes, Percina manitoti.) 



The largest of its sub-family, and among the most abundant in the 

 northern part of tbe State. Our collections contain specimens from the 

 borders of Lake Michigan to Cairo and the Wabash Valley. In Northern 

 Illinois it is extremely common in the small lakes and in the streams con- 

 nected with them, and likewise occurs in other creeks. 



Genus 11. Cottogaster, Putnam. 



21. Cottogaster shumardi, Grd. 



(Bui. II, 39; Imostoma shumardi: Synop., 498; do.) 



Somewhat rare in Illinois, and occurring chiefly in large streams. It has, 

 in fact, been taken by us only from the Rock, Illinois, and Wabash rivers. 



• Genus 12. Diplesium, Raf. 



22. Dijjlesium blennioides, Raf.— Green-sided Darter. 



Found by us only in the Wabash valley, where it is not rare. Collected 

 from the little Wabash, at Flora. 



Genus 13. Boleosoma, De Kay. 

 Tessellated Darters, 



23. Boleosoma camurum, Forbes. 



(Synop., 493; Vaillantia camurum.) 



This little species is wide-spread, but somewhat rare, occurring throughout 

 the State in creeks and ponds, but much more abundantly to the southward. 



24. Poleosoma nigrun, Raf. — Johnny Darter. 



(Bui. II, 400; Boleosoma olmstedi, Boleosoma maculatum.) 



By far the most abundantly and widely distributed of the darters, occur- 

 ring in almost all watei's, though of course far more abundantly in creeks, 

 and preferring rocky shallows. I do not know that it is ever found in foul 

 or muddy situations. It ranges throughout the State fi'om the Galena and 

 Calumet rivers on the north, southward to Union county. 



Genus 14. Ammocrypta, Jordan. 



25. Ammocrypta asprella, Jordan. 



(Bui. II, 38; Pleurolepis asprellus.) 



The only specimens of this species in our collections are the original types, 

 taken in a small bluff stream in Hancock county. It is reported by Dr. Jor- 

 dan, however, to range from Illinois to Alabama. The creek in which the 

 type occurred is a muddy stream, with occasional reaches of gravelly bottom. 



