66 THE FISHES OF OHIO. 
Order: IOSPONDYLI. 
Family: WIODONTIDA. 
Genus:  Hi1opon. 
Key to Spectes. 
A. Belly in front of ventrals carinated; dorsal with 9 developed rays.— alosoides. 
AA. Belly in front of ventrals not carinated; dorsal of 11 or 12 developed rays.—/ergisus. 
Hiodon alosoides (Rafinesque). 
Head 4%; depth 3%; eye3%. D.9; A. 32; scales6-56-7. Body closely 
compressed, becoming deep in the adult, the ventral edge everywhere carin- 
ated. Maxillary reaching middle of eye. Caudal peduncle rather stouter 
than in HZ. ¢fergisus, and the fin not so deeply forked; also, the pectorals are 
longer and the ventrals shorter than in A. fergisus. Color bluish, sides 
silvery, with golden luster. Length 12 inches, 
Rare in Ohio, the range of the species being farther to the 
west. A single specimen, taken in a fisherman’s net in the Ohio. 
river, was recorded by Henshall for Hamilton County, 1888. 
Hiodon tergisus Le Sueur. Moon EvE; TOOTHED HERRING. 
Head 41%; depth 3; eye 3. D.12; A. 28; scales 5-55-7. Body oblong,,. 
moderately compressed. Eye large, the maxillary barely reaching its mid- 
dle. Pectoral fins not reaching ventrals, the latter just short of vent. Belly 
somewhat carinated behind ventrals only. Color brilliantly silvery, olive- 
shaded above. Length 12 inches. 
This species is confined to Lake Erie and the Ohio river, and 
the lower courses of their larger tributaries, but it 1s common 
where found. Rafinesque made four species of it, and reported 
two of them for the Ohio as far as Pittsburg. Three of these 
nominal species, 47. clodalus, H. vernalis and Hf. tergisus, were 
recognized by Kirtland in his 1838 report, but he afterward 
dropped all but 1. ¢exg7sus. ‘‘ Common in the Ohio,’’ Henshall, 
1888; Lorain County, ‘‘common in the lake, ascending the 
streams sometimes,’’ McCormick, 1892; ‘‘ below the dams in the 
Maumee river at Defiance and Grand Rapids, at both places they 
were very abundant,’’ Kirsch, 1893 ; Ohio river at Bellaire, R. C. 
Osburn, 1900. 
