1S 
tera modes Baétis and .other ephemerids (twenty per cent.) 
Agrionide and large Libellulide, and fifteen per cent. of case-flie 
(Phryganeidex.) Pond-weed (Potamogeton) found in two stomachs 
had probably been taken accidentally. 
CHMNOBRYTTUS GuLosus, C. & V. Wipr-MouTHED SUNFISH. 
This fine species is among the commonest of the family in tlh 
lakes and ponds of Southern Illinois, where it is commonly know 
as the ‘“‘Goggle Kye.” 
The northern limit of its range, as far as known, is the Minos 
River valley. In numbers and habitat it replaces in the South th 
Eupomotis aureus of the north; but this equivalence is only appar 
ent, as the two species differ widely in food. From its size a 
abundance, it is no insignificant food resource. 7 
Food of the Young. : 
My smallest specimens were from lakes in the Mississippi bottom 
near Bird’s Point, Missouri. Two of these, one inch long and under, 
taken in September, 1579) had eaten only Bosmina longiros 
tris and Cyclops. Insect food first appears in specimens one 
and a half inches long. Hight specimens, between one and_ three 
inches long, six of which were taken from a lake in the Illinois 
bottoms, near Pekin, in October, 1879, and two from a lake in Ken 
tucky, near Cairo, Illinois, had eaten about forty per cent. Entomos: 
traca, thirty per cent. Neuroptera larve, and thirty per cent, Corixas 
and Diptera larve. Daphnia pulex, Simocephalus americanus, Boma 
lonqgirostris, Chydorus, Pleuroxus. and Cyclops, were among the En: 
tomostraca. Coriza alternata was found among the hhvonom 
Most of the Diptera (i. e. fifteen per cent.) were larval Cesguaet 
Food of the Adults. 
Six adults, from rivers, streams and lakes in. Central and South 
ern Illinois, ‘show the usual change in food, carried farther than in 
the preceding species. Eintomostraca disappear—except a few Chydorus 
in a single specimen—and fishes become the principal reliance, 
amounting to forty-seven per cent. of the food. Corixas, larve @ 
Palingenia bilineata, and some terrestrial Coleoptera—Anomala 
binotata—which miade half the food of one specimen, are the remain: 
ing items. 
The especially piscivorous habit of this species is probably relatec 
to the size of its mouth, which is much the larger among the sun 
fishes proper. A similar relation has already been noticed between 
the two black bass. : 
