IOWA ACADEMY OF SCIENXT.S. 47 



This is II well marked variety o[' Moxostom'i inarrolepi<loti(i>i and is quite common 

 in our area. The lar<?e sized, red fins, coarse scales, and peculiarly compressed 

 pharyngeal tc-eth render it very easy of distinction. It is found in streams of either 

 Tapid or slow current, appearing indifferent to either condition. In the deeper 

 holes in the larger streams it may always be found . 



Moxostoiiiji aiireoliim Le Sueur. — Lizard creek. Ft. Dodge. 



This species occurred to us but once within the limit assigned to this paper. The 

 locality abounds with the common Moxosfoma duquesuei and among them were 

 found a dozen or more of this species. It is common in the great lakes of the 

 no)th and may not stand as a good species on further study. 



Pla('<>i>liaryiix carinatus Cope. — Raccoon river, Adel and Perry. 



This form will yet, no doubt, be found throughout our area. It is essentially 

 western, having been described from the upper Missouri. It is difficult of separa- 

 tion from the common red-horse which it greatly re-sembles superficially except on 

 careful examination of the pharyngeal teeth. It is " a large coarse sucker, exter- 

 nally similar to the species of Moxostonui, from which genus it differs only in the 

 remarkable development of the lower pharyngeals and their teeth; the bones are 

 very strong, and six to ten of the lower teeth are enlarged, little compressed, with 

 a broad rounded or flattened grinding surface; the mouth is larger and more 

 oblique than in Morostoma macrolepidolniii and the lips are thicker." — Jordan. 

 Large numbers of this form were taken the present year in Northwestern Iowa, but 

 the localities are all outside the limits imposed by this paper. 



CYPRINID.E. 



(The Minnows.) 



Campostoma aiiomaliiiii Rafinesque. — Beaver creek; Four Mile creek; Raccoon 

 river at Adel, Des Moines; North river; Middle river; Walnut creek; Beaver creek, 

 and Four Mile creek, Polk county. 



This usually abundant form has not occurred to us in the great numbers which 

 characterize its pi-esence generally. It is one of the most easily recognized of the 

 ■Cfiprinidae because of the great peculiarity of certain anatomical features, the 

 intestines alone being several times the length of the body. Moreover this organ 

 is coiled in a characteristic manner about the air-bladder, a fact which no other 

 minnow, the world over, presents. A vegetarian in food habit, the great length of 

 the intestines is readily understood. When taken the abdomen, or ventral region, is 

 usually distended and greenish in color, due to the nature of the contained food. 

 The scales are irregularly mottled, giving to the fish a peculiarly dirty appearance. 

 In common with the other Ci/prinidae it never attains but small size. 



Chrosoinus erytbrogaster Rafinesque. — Walnut creek. 



This most beautiful minnow has occurred but once in our area. Three specimens 

 represent the results of most assiduous collecting. The small but clearly defined 

 scales, closely crowded, the graceful outline, the brilliant spring colors of males and 

 females all conspire to render this form of easy determination; the infrequency of 

 its occurrence in aquaria, therefore, seems to point to its rarity in this section of 

 Iowa, though it is reported abundant in other localities. While widely distributed 

 throughout the great Mississippi Valley, it attains its maximum abundance and 

 beauty in the Ozark region of Missouri and Arkansas. It is, in nuptial coloration, 

 probably the most gaudy fish in our waters. 



Hybognathiis imcIialisAgassiz.— Walnut creek; Raccoon river at Adel, Perry 

 and Des Moines; Beaver creek; Squaw creek, Ames. 



