382 Transactions. 
I have estimated the proportions of different foods in the total number 
of stomachs to be—Fishes, 60 per cent.; insects, 18 per cent.; crayfish, 
T per cent. ; molluscs, 2-5 per cent. ; plants, 12-5 per cent. ы 
Galazias.—The average length of 16 Galazias sp. from the stomachs of 
Rotorua and Rotoiti trout was 56 mm. І believe most to be Galarias 
brevipinnis, but identification cannot always readily be made on partly 
digested specimens. In all, 23 trout had eaten 132 Galaxias, an average 
of 54 per trout. 
Gobiomorphus.—The common bully, Gobiomorphus gobioides, was found 
to be the most common fish-food. In order to ascertain the number of 
Insects.—The insect contents of the stomachs examined were generall 
insect food. At this season insect food is probably poorer in the lakes 
than during most pde of the year. Dipterous larvae and cicadas were 
un 
found large numbers in the stomachs of trout from Lake Rotoiti. In 
the tabulated list 11 trout had taken 17 Paranephrops, an average of 14 
per trout. i 
)yrgus. — Тһе mollusc Potamopyrgus spp., of which there are 
several varieties, is found in all lakes, often being attached to the pond- 
weed, Potamogeton Cheesemanii. Seventeen trout had eaten 188 Potamo- 
pyrgus, an average of 11 per trout. Allowing for bones and cartilage, I 
have ascertained that a small Galazias БО mm. long equals in weight 36 
molluses without the shell. 
‚ 2 татів. —Out of the total 31 stomachs containing plants, 9 contained . 
Nitella, 7 Cladophora, 4 Ulothriz, and 4 Мукор» ни Twenty 
stomachs were examined from the various lakes during September, October, 
and November, 1918 and 1919, and of these 15 contained an average of 
40 per cent. plants. It will be seen that the proportion of plant food 
eaten was considerably less during February of this year. 
ierosec Organisms.—In 38 stomachs diatoms were found. Other 
organisms in varying numbers were Rotifera, Paramoecium, Amoeba, and 
es, Gravel, and Pumice.—It seems likel 1 
: , ^n y that most sand or grave 
in the stomach is taken accidentally with other food. In the case of 
pumice being taken it is possible that here also it had been accidentally 
swallowed owing to the buoyancy of the stone. 
