(40) 
Genus RHEOCRYPTA , Jordan. 
9. * Rheocrypta copelandi Jordan. Copeland’s Darter. (M. Y. 222.) 
Known only from White River, near Indianapolis. 
Genus DIPLESIUM , Rafinesque. 
10. Diplesium blennioides (Raf.) Jordan. Green-sided Darter. (M. Y. 
222 .) 
Abundant in the Wabash valley, Crawford Co. 
Genus BOLEOSOMA , Dekay. 
11. Boleosoma olmstedi (Storer) Agassiz. Tessellated Darter. (M. Y. 
224; Nelson, 35). Lake Michigan, Ogle Co. 
12. Boleosoma maculatum Agassiz. Johnny Darter (M. Y. 224 ; 
Boleosoma brevipinne Nelson, 36.) 
Common throughout the state, in clear streams. Pine Cr., 
Ogle Co.; Illinois R., Pekin; Normal; Drury Cr., Union Co.; 
Clear Cr. 
[13. Boleosoma camurum , Forbes, n. s. 
In re-examining the collections of the Laboratory for the purpose of 
adding to this paper the details of distribution and other minor points, I 
made a few observations on some Etheostomatidae and Cyprinidae which 
seem worthy of record, and I therefore insert them here, at the suggestion of 
Dr. Jordan. 
Specimens from several localities in the state, mixed sometimes with 
Boleosoma maculata and sometimes with Boleichthys eo prove, on closer 
examination, to be a Boleosoma quite distinct from maculata , and appa- 
rently undescribed. 
The general appearance is much like that of maculata , but the lateral 
line is incomplete, the species is more slender, has a greater number of ver- 
tical rows of scales, a blunt nose and a scaly head. 
The length is from 45 to 50 mm. Depth 5 & to 6 in length, caudal 
peduncle 3?, head 4 to 4L Eye 3f in head, nose % eye, and almost trun- 
cate. Mouth inferior, horizontal, upper jaw the longer, and decidedly pro- 
tractile. There are no naked areas, except a narrow strip before the dor- 
sal. Yertical rows of scales 54 to 57, with the lateral line usually extend- 
ing over from 23 to 35 scales. 5 longitudinal rows above lateral line. In 
a few specimens 35 to 50 mm. long, there is only a trace of a lateral line on 
4 or 5 scales. Scales smaller before dorsal, about 4 those on sides. 
D. IX or X — 10 to 12, A. I — 8 or 9. tipper D. half as high as 
long, about | r height of 2d D., and contiguous to it. Second length of 
first, and 2 longer than anal. Anal spine weak and short, length of fin £ its 
height. Ventrals and pectorals reach the same point, £ to vent. 
