(46) 



86. R. limatus, dope. Fork-tailed Dace. Specimens from Rock river 

 are in Prof. Jordan's collection. 



87. R. meleagris, Ag. A very large number of specimens of this 

 species are in the state collection, from Bailey's creek, McLean county, 

 where Prof. Forbes found them in abundance. Agassiz's description is so 

 incomplete that I insert the following from one of the Illinois specimens. 

 The species is well marked, and may be easily recognized. A few specimens 

 were taken in the Vermilion river : 



Head 2 2-5 in length ; depth 4i. Eye small, 5 in head. D. I, 7 ; A. 

 I, 6. The barbels are long and distinct. The snout projects considerably, 

 overlapping the lower jaw. Dorsal much nearer tail than tip of snout. 

 Upper half of body dark, sharply outlined by the light of the under parts. 

 The dark mottlings are not so profuse as in most of the species. The body 

 is stout, deeper and thicker than in most members of the genus. 

 Genus Phenacohius, Cope. 



88. P. teretulus, Cope, var. liosternus, Nelson. A number of specimens 

 of this form are in the state collection, from small streams in McLean county, 

 where it appears not to be uncommon. The following is the description of 

 the adult : 



Head 4^ in length; depth 4f. Eye 4^ in head. D. I, 7; A. I, 7; 

 ventrals 8. Lateral line 43 to 45 ; longitudinal rows 5-4 ; scales in front 

 of dorsal, 16 ; length 3 inches. Dorsal in front of ventrals, much nearer 

 snout than caudal. Scales in front of dorsal small. Intestine short, peri- 

 toneum pale. Head long; mouth inferior, lateral line first decurved, then 

 straight. Pectorals do not extend to ventrals, ventrals reach vent. Teeth 

 4-4, hooked. Color olive above, sides bright silvery overlying a plumbeous 

 shade ; a small but distinct caudal spot. Thoracic region entirely naked. 

 Lips fleshy, as in the Catostomidae. 



Genus Hybopsis, Ag. 



89. H. storerianns, (Kirt.) Ag. Storer's Minnow. Two specimens in 

 my collection, from Lake Michigan at Chicago. The following is the de- 

 scription of one of the specimens : 



Head in length 4f ; depth 4f ; eye in head 3 times, and longer than 

 snout ; very large and white. D. I, 8 ; A. I, 7. Lat. 1. 40. Dorsal over 

 ventrals, nearer snout than to caudal ; 20 large scales in front of dorsal ; 

 lateral line nearly straight ; pale above, sides bright silvery ; intestine 

 short ; peritoneum white. This species presents much the appearance of 

 amorus, Grd. 



90. H. hudsonius, (^C lint.') Put. Spawn-eater. Occurs in Lake Michi- 

 gan. (Jordan.) 



91. H. tuditanus, Cope. Described from Lake Michigan. I have seen 

 no specimens. 



92. H. sframi'neus, Cope. Very common in creeks through central 

 Illinois, and probably occurs elsewhere, but no specimens have been taken. 



93. If. voluceUus, Cope. Specimens have been received from the 

 Rock and Pecatonica rivers, by Prof. H. E. Copeland. 



