THK GOLDEN TROUT. 45 



('Iilr(iiniiiil(hi.- Four stoinaclis coutiiined 95, SO, 3, and I per cent cliiroiioniid 

 larviv. 



Coleoptera. — The contents of (! stomachs consisted of 75, tiO, 20, In, 10, and 0.25 

 per cent beetles. 



I[j/hi()iopfen(. — Three stomachs contained ants, two -la per cent, and tlie other 1 

 per cent. 



Ills,,-! fr<ifjiiii:i}U. — Small fragments of insects constituted from H per cent to (So 

 per cent of the entire stomach contents of 9 specimens. 



V,,j,f,il>l, iiiiifter. — Five stomachs contained 40, 30, Id, 7, and 0.5 per cent 

 vegetable matter. In one or two instances part of this vegetable matter was prol)- 

 ablj' derived from the cases of caddis-fly larva>. 



The following pei'centages show the relative importance of the various elements 

 of the stomach contents for all 12 .specimens. These average percentages were 

 obtained by adding together all the percentages of each element and dividing this 

 sum l)y 12. Arachnida 0.16, Ephemerida (May -fly larvae) 1, Plecoptera (adult stone- 

 flics and nymphs) .3.9, Hemiptera 0. OS, trichopter larvse 11.23, cases of trichopter 

 larvw 9.2, Diptera 1.5, chirononiid larvae and pupje 15, Coleoptera 15, Hymenoptera 

 (ants) 4.23, insect fragments 31.4, vegetable matter 7.3. This shows that trichopter 

 larva?, chironomid larva? and pupse, and Coleoptera were the most important food 

 elements, as these three together constituted a little over 41 per cent of the stomach 

 contents of the 12 trout. 



Soda Crekk. — Six trout of the same species were obtained from this stream at 

 Quinns Horse Camp on July 16, 1904. They varied in length from 4.5 to 6.5 inches. 

 Five of the stomachs were estimated to be fronx one-half to two-thirds full and the 

 sixth about one-fourth full. 



Ephemerida. — One stomach contained 15 per cent May-fly nymphs. 



Plecojifera. — One specimen had eaten 15 per cent adult stone-flies and two had 

 each eaten 20 per cent stone-fly nymphs. 



Orthiiptera. — One specimen contained 25 per cent remains of a grasshopper 

 (locust). 



Trlchopievn. — Three stomachs contained 60, 20, and 15 per cent caddis-fly larvse 

 and another 90 per cent larva? and larval cases together. 



('hironomidse. — The contents of one stomach consisted of 1 per cent chironomid 

 larvic. 



Ooleoptei'a. — Twenty per cent of the contents of one stomach and 5 per cent of 

 another consisted of remains of beetles. 



IhliiiiiKipt, I'd. — One stomach contained 15 and another 10 percent ants. 



fiisKT fi;i(iiii,iit><. — The contents of all six stomachs consisted of 10 per cent to 

 99 pel' cent small fragments of insects. 



Veijetahle matter. — Two specimens had partaken of vegetable matter to the 

 extent of 5 and 2 per cent. 



The following are the average percentages for these six specimens: Ephemerida 

 (May-fly nymphs) 2.5, Plecoptera (adult stone-flies and nymphs) 9.22, Orthoptera 

 4.16, trichopter larva? 30.82, chironomid larva^ 0.16, Coleoptera 4.1t», Hymenoptera 

 (ants) 4.16, insect fragments 43.66, vegetable matter 1.16. Trichopter larva?, with 



