119 
Table of food of Eupomotis and Centrarchus—Continued. 
r EvpPoMotis. | CENTRARCHUS. 
mo as he ta basi eA d— 
Pease by ai =i a =) Bb oY 
Oia o i @ (a>) Ss 
t= en a = Ss n =I =I nm 
@ sels LOT : i) fc) : 
sent drodaae ee es 
2a ae hs 
— —e ¢ 
2 | 5 5 5 | = 
; me | St a |; 
fe) oO ie) ‘ 
| p cp ny 
Number of specimens examined ......--.-.-.---- 9 5 2 9 5 | Lites 
ea =. 
Bermiphipoda (Aliorchestes) ._.t. .ss.csc teens 00205226] oce--- Vern ldis (£951 rts TY 1 Elna kb pe 
BOC A (ABO NUS) cies roo kc et ess Arap Cotite Dawe aeeecoel Suds | Bese chet s ioe OS irdes ot hnats oul atanror 
Ss oy ee ON ee ee ay Oe ee es Soe ed ate aliens = te 71 | a ge 
CT RAGGOlG sat ra cee = nn cn osiigno tenon Fog ae came nee mn 2H Sho. 08) cas Seis | ie sen By A 
PRIMO Der Sent fel oo a.s Sa uhws esd eames neste 3 12 Ole ar eee LOS al teste c 
SR ere ti eS 2 See bani ane eautene Sab cia gels #9 26) I bt Deas eed 21 Bolas 
MOTTO GE teen Soares a= oe oe Me eee Wok wae eralioe salem Pe cers eset eaan ap 38 45 09 
_V.. VEGETATION... . .....---202-c2--ne seer essen eceeee! i Pee LZ\ sade he we oe ree 
CSR ap iy gE A ee eae SE” AS ee hee peony aca eM eres ae ae OE. 
PU s ob Sera toss 6 sk oon ls Paws REGRESS Se eee Perit pov OG ie tee tics relates 
ES ee re ne Ns igh au oe Sakeap ease aap =< aE AES Pi Gens ce UD Pees se teers 
1 
CENTRARCHUS IRIDEUS, Lac. 
This little species is found in considerable numbers in ponds and 
streams in the southern hill-country of Illinois. My specimens, all 
taken in July, are from ponds and streams in the Mississippi bot- 
toms in Union and Jackson counties, and from Cache R. and its 
tributaries in Johnson county. 
Five of the young, from three-fourths of an inch to an inch in 
length, had eaten seventy-one per cent. of _Kntomostraca and twenty- 
one per cent. of larve of Chironomus; and, for the rest, about equal 
quantities of ephemerid larve and young Allorchestes, with a trace 
of water mites (Hydrachnide). 
Thirty-eight per cent of the food was Cyclops; cyprids amounted 
to twenty-one per cent,; and twelve per cent. of Simocephalus com- 
pleted the ratio of Kntomostraca. The smallest specimen, three- 
fourths of an inch long, had eaten sixty per cent. Simocephalus and 
forty per cent. Cyclops. 
About a fifth of the food of one specimen, an inch and an eighth 
in length, consisted of minute young Corixas, the remainder being | 
about equally Cyclops and cyprids. : 
Only two specimens were examined which could be classed as 
adults,—one three and a fourth inches long, the other smaller. 
These indicate that the food of full-grown individuals differs from 
that of the young chiefly in the addition of considerable quantities 
of terrestrial and aquatic insects. 
The gill-rakers of this species are numerous, long and slender—a 
fact reflected in the food. Fifteen per cent. of the contents of the 
