70 



Genus 43. CoUESius, Jordan. 



74. Couesius prosthemius, Cope. 



Not in our collection. tSpecimens from near Evan.ston, taken in Lake 

 Michigan, are said by Dr. Jordan to be in the National Museum. 



Genus 44. Rhinichthys, Agassiz. 



75. Rhinichthys atronasus, Mitch. — Blagk-NOSED Dace. 



(Bui. II, 62 and 63; Rhinichthys cataractce, Rhinichthys obtusus Rhin- 

 ichthys meleagris: Synop., 207, 20^; Rhinichthys cataractce., Rhin- 

 ichthys atronasus, Rhinichthys obtusus.) 



This is essentially a brook species, delighting especially in swift and rocky 

 streams. We have not found it in Southern Illinois, its localities being con- 

 fined, in our experience, to the northern half of the State. Its relative rarity 

 here is doubtless due to the infrequent occurrence of suitable streams. 



Genus 45. Phenacobius, Cope. 



76. Phenacobius mirabilis, Grd. 



(Bui. II, 61; Phenacobius scopiferus.) 



Occurs somewhat rarely throughnut the State, from Galena to extreme 

 Southern Illinois; almost invariably in small, swift streams, or in the rapid, 

 rocky parts of more sluggish creeks. 



Genus 46. Ericymba, Cope. 



77. Ericymba buccata, Cope. 



We have found this species only in the sandy stretches of the tributaries ;of 

 the Wabash, where it is locally very abundant. 



Genus 47. Notbopis, Raf. 

 Shiners. 



78. Notropis dinemus, Raf.— Emerald Minnow. 



(Bui. II, 60; Notropis rubrifrons, Notropis other inoides: Synop., 202 and 203;; 

 Minnilus rubellus, Minnilus dinemus, Minnilus rubrifrons.) 

 Excessively abundant; far commonest northward, but confined everywhere 

 almost strictly to the larger lakes and rivers. Not a single specimen has oc- 

 curred in our collections from the smaller lakes in Northeastern Illinois, while 

 the waters of Lake Michigan, a few miles distant, were swarming with them 

 along the shore. Not abundant in the Ohio and northern Mississippi, but 

 rather common in the Illinois. From the smaller tributaries of these streams 

 we have not so much as one.of this species. In the Wabash and Saline 

 Rivers, in Southern Illinois. 



79. Notropis macrolepidotus, Forbes. 



A very rare minnow, taken thus far only from the Illinois River. 



80. Notropis atripes, Jordan. — Red Fin. 



(Bui. II, 59; Ly thrums atripes, Lythrurus diplcemius: Synop., 197; 3Iinnilus 



atripes, Minnilus diplcemius.) 



This species prefers especially small clear streams, in which it is occasion- 

 ally abundant; but, owing probably to the relative scarcity of such waters ia 



