90 



Genus 11. Cottogaster, Putnam. 



21. Cottogaster shumardi, Grd. 



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



Somewhat rare in Illinois, and occurring cLiefly in large streams. 

 It has, in fact, been taken by us ^only from the Rock, Illinois, and 

 Wabash Elvers. 



Genus 12, Diplesium, Raf. 



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



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

 Collected from the i-ittle 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 abun- 

 dantly to the southward. 



24. Boleosoma nigrum, Raf. — Johnny Darter, 



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



By far the most abundant and widely distributed of the darters, 

 occurring in almost all waters, though of course far more abun- 

 dantly in creeks, and preferring rocky shallows. I do not kuow that 

 it is ever found in foul or muddy situations. It ranges throughout 

 the State from the Galena and Calumet rivers on the north, south- 

 ward to Union county. 



Genus 14. Ammocrypta, Jordan. 

 il5. Ammocriipta asprella, Jordan. 



(Bui. II, 38 ; Pleurolepis asprelliis.) 



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, Jordan, however, to range from Illinois to 

 Alabama. The creek in which the type occurred is a muddy 

 stream, with occasional reaches of gravelly bottom. 



26. Ammocrypta pellucida, Baird. — Sand Darter. 



(Bui. II, 88 ; Pleurolepis pellucidus.) 



The range of this little darter is limited strictly by the character 

 of the streams which it prefers, as it seems to occur only in some- 

 what swiftly running waters with sandy bottom. We have taken it 

 in the Little Wabash and the Embarras, and some other creeks of 

 the Wabash Valley, but not elsewhere in the State. 



