292 



AN INTRODUCTION TO ENTOMOLOGY 



The larva (Fig. 329) is campodeiform. Its mouth-parts are 

 formed for sucking as in the larvcC of ant-Hons (see page 282) ; they 



Fig. 328. — Wings of Sisyra flavicornis . 



are very long; and two sucking organs, each formed of the mandible 

 and maxilla of one side, are closely parallel for the greater part of 

 their length. Each of the first seven abdominal segments bears on 

 the ventral side a pair 

 of jointed filaments 

 which are believed to 

 be tracheal gills. 

 When full-grown, the 

 larva leaves the water 

 and spins over itself, 

 on some object near 

 the water, a hemi- 

 r;pheric cover of close- 

 ly woven silk, at- 

 tached by its edges to 

 the supporting surface, 

 and a complete inner 

 cocoon of consider- 

 ably smaller size, like- 

 wise closdy Vv^oven. 



The silk-organs of the larva are described 

 on pages 282-3. 



Climdcia dictyona. — This species resem- 

 bles the preceding in size but is yellowish 



Fig. 330. — Cocoon and 

 cocoon-cover of Cli- 

 macia. 



Fig. 329. — Larva of Sisy- 

 ra umbrata. (After An- 

 thony.) 



