222 



APPLIED ENTOMOLOGY 



Smaller species, some with gray, black, or black wings spotted with 

 white, belong here. They are often quite common around streams and 

 ponds during the summer months and are frequently called "Fish-flies." 



Fig. 217. — Adult Corydalis, about natural size and its larva. (From Sanderson and 

 Jackson, Elementary Entmology; after Comtstock.) 



The members of the family Chrysopidae are of great economic im- 

 portance as the larvse feed freely on injurious insects, particularly aphids, 

 and are so voracious, that they are often called Aphis-lions. The adults 

 (Fig. 218) are rather small, slender-bodied insects averaging less than an 



Fig. 218. — Adult Lacewing (Chrysopa plorabunda Fitc-h), slightly reduced. {From Folsom.) 



inch long, with long antennae and large, finely-veined, green wings, which 

 when not in use are carried sloping over the body. These adults are 

 sometimes called "Golden-eyes" because of their shining, golden-yellow 

 eyes, but perhaps more frequently "Lace-wings" from the delicacy and 

 beauty of these structures. 



