ORDERS OF INSECTS 



15 



(Fig. 11) a household pest, and the latter minute and occurring in 

 swarms in moist situations. 



Order Ephemerida. This includes the delicate May flies so 

 abundant in spring and early summer. They have four delicate 

 wings, and live but a short time as adults. The young stage, 

 nymph, is found in the water (Fig. 12). 



Order Neuroptera. This group is characterized by the pres- 

 ence of four delicately veined wings. Representatives of the order 

 are the Golden-eyed Lace-winged fly, whose larva consumes plant 



FIG. 11. -A "silver fish 

 or "fish moth." 



FIG. 12. May-flies. Nymph and imago 

 in foreground. 



lice, and the "ant-lion, " whose larva digs pits in sandy soil, wherein 

 it lies in wait for other insects (Fig. 13). 



Order Mecoptera. A very small group containing the scorpion 

 flies. 



Order Trichoptera. Caddis-flies or Caddis-worms. Four- 

 winged with a complete metamorphosis. The larvse construct 

 cases of sand, gravel, and frequently of leaves, etc. In these cases 

 they pass their larval life, crawling about on the beds or bottoms 

 of streams. The mouth parts of the adult are rudimentary (Fig. 14). 



Order Odonata. The dragon flies and damsel flies, with four 

 wings of nearly equal size, biting mouth parts, and large compound 



