Abstract
While making a study of the insect larvae, mayflies, stoneflies and caddisflies of mountain lakes and streams in the Front Range of the Rockies near Tolland, Colorado,2 it was observed that, with very few exceptions, the species living in the lakes and quieter parts of the streams had the respiratory organs larger in proportion to the size of their bodies than the larvae living in the swift streams. It was also noted that there was a tendency for the species living tinder stones in the stream and on pond bottoms with much decaying plant material to have large respiratory organs. These facts seem to be correlated with two things, (i) the oxygen content of the water and (2) the swiftness of the current. With these observations in mind, sudies were made to determine the relationship between the area of the respiratory surface and the body weight for the representative species of the different habitats. I. MAYFLY NYMPHS
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