Descriptions of New Illinois Fishes. 137 



gill are rather slender, about .2 the length of the gill filaments. 

 The head and body are contained 2.4 times in the length of the 

 intestine. The eye is circular, of moderate size, 4.1 in head; the 

 branchiostegal rays are broadly united to the isthmus. Dorsal 

 I 8. unusually high, its longest ray contained 4.5 times in 

 head and body, the length of the fin 9.1. The anal is also high, 

 I 7, its height 5.5 in length, its length 9.75. The caudal is 

 long, not very deeply forked; the pectorals and ventrals are of 

 moderate size, the latter reaching the vent, the former 5.4 in 

 length of fish, not attaining the ventrals. The scales are very 

 small and uniform, 63 in the lateral line, with 20 longitudinal 

 rows, and 31 scales before dorsal. 



This species is represented by a single specimen obtained 

 from the Illinois River at Peoria in 1878. 



NOTROPIS PHESTACOBIUS, n. S. 



This fish unites with a strong general resemblance to Phe- 

 nacobius the characters of Notropis. The body of the adult is 

 short and deep, the head square, the nose long, and the eye un- 

 usually large. Length 2.5 in., depth 3.5 to 4: caudal peduncle 

 4 to 4.75. Color in. alcohol indefinite; sides somewhat silvery, 

 scales along and above the lateral line slightly specked with 

 black. The head is quadrate in transverse section, flat above, 

 3.75 to 4: nose decurved, 3.4 to 3.5; interorbital space 2.9 to 3.1. 

 The mouth is inferior, horizontal, rather small, lips fleshy, not 

 lobed, lower jaw much the shorter, 2.75 to 3.1 in head, upper 

 lip opposite the lower margin of the pupil, upper jaw to poste- 

 rior margin of nostrils, 3.33 to 3.9 in head. Teeth 4 4. In- 

 testine about equal to head and body, .97 to 1.17. Eye very 

 large, circular, placed high up, 3.4 to 3.5 in head. Branchios- 

 tegals free from isthmus. Dorsal I 8, decidedly before ven- 

 trals, its length 7 to 8 in body; anal low, I 8; paired fins 

 rather broad and short; ventrals not reaching vent, and pecto- 

 rals falling far short of ventrals, the former 6.25 to 6.4 in head 

 and body. The scales are thin, large, crowded anteriorly upon 

 the sides, breast wholly naked in all the specimens seen. Lat- 

 eral line 35 to 36, longitudinal rows 7 to 9, 13 to 14 before 

 dorsal. 



Described from 10 specimens, the only ones seen, all taken 

 at Peoria, 



