WATER I. \ SECTS 



19:j 



rear the nymphs, use the methods described for Dragon Fly 

 Nymphs. 



DoBsox Fly Larvae (Fig. 23). 



Dip net sweepings among the rocks in streams sometimes 

 brings up a creature which at first sight looks like the Water 

 Tiger, but ^vhich has tapering projections along the sides of the ab- 

 domen. The head bears a pair of strong jaws and on the thorax 

 are three pairs of legs. It feeds on other water insects. The full 

 grown insect, the Dobson Fly, is that large net-winged insect with 

 long antennae and bulging eyes which is so often killed around 

 electric lights at nigrht. 



^3 



Immature Insects. — 2(>. Damsel Fly Xymi'Hs: 'il. \V.\ter Tig- 

 er (Larva of the Diving Beetle) ; 22. Water Scavenger 

 Beetle Larva; 23, Dobsox Fly Larva. 

 Crane Fly Larvae (Fig. 24). 



These footless, worm-like, dirty brown larvae are often found 

 in the moss, slime, or decaying leaves on the wet banks of streams 

 very near the edge of the water. They may also be found in the 

 wet rotten parts of partly submerged logs. The head is small 

 and inconspicuous, while the tip of the abdomen usually bears 

 several fleshy projections surrounding two large dark circular 

 breathing pores. The pupa differs from the larva in having n 

 distinct head on the tip of which are two long breathing tubes. 

 These creatures are the immature stages of the Crane Flies, those 



