CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 



97 



C. Abdomen with 2 or 3 long filaments; lower wings much smaller 

 than upper; antennae short.^ — Ephcmcrida (May-flies) (Fig. 53).. 

 CC. Abdomen without jointed filaments; wings about equal in size; 

 antennas short. Odonata (Dragon-flies). 



The larvae of most of the Neuropteroid insects are aquatic and are of little 

 economic importance in agriculture. They are of importance, however, in fish- 

 culture. In the Stone-flies Newcomer has recently reported that several species of 

 Taniopteryx (especially T. pacifica) with well developed mouth-parts cause consider- 

 able injury to foliage and fruit in Central Washington. 



Fig. 52.- 



-M ay-fly {Hexagenia), adult. 

 {After Folsom.) 



Fig. 53. — May-fly, nymph. 



LARVAL FORMS OF THE NEUROPTEROIDA 



A. Body cylindrical, caterpillar-like. — Mecoptera. 

 AA. Body more or less depressed, not caterpillar-like. 



B. Mandibles united with corresponding maxiUte. — Netiroptera. 

 BB. Mandibles separate from corresponding maxillae. 



C. Body encased in a shell of gravel, etc. — Trichoptera. 

 CC. Body not encased in a shell. 



D. Abdomen with external lateral gills and terminated by 2 or 

 3 long gill processes. — Ephemerida (Fig. 53). 

 7 



