7- 

 S. 



y- 



lO. 



1 1 . 



I 2. 



13- 



14. 

 ■5- 



CECIDOMYIA. Gall Gnat. 



reddish; body with black l:)ands ; wing blackish, hairy. 



On 



C. soUdaginis. -^^ in 



stein of goldenrod. 

 C. Itirtipes. Bright red, with black hair. 

 C. sei-rulata. Brown. On alder. 



C. chrysopsidis. i^ in. ; red ; wing gray, hairy. On golden aster. 

 C. destructor. — The Hessian fly. ^ in. ; black; body tawny, with black rings; wings 



black. Ill the stems of wheat, which causes it to stunt in growth. 

 C. tritici. — The wheat midge. -jV in. ; like the last, but wnigs transparent. Attacks 



the ear of wheat. 

 C. rohiniiV. li'j in. ; forms swellings in the locust stems. 

 C. ffrossii/ariiC. Causes the gooseberries to turn prematuie 1 eii and rot. 

 C. salicis-rigidcv. \ in. On willows. 

 C. strohlloides. Causes the pine cone-like end-huts on willows. 



in them. 

 C. piui-itiopis. Attacks the needles of the pine trees. 

 C. ornata. y'^ in. ; body red ; wings with five brown spots. 

 C trifolii and C. leguininicola . In clover-leaves. 



C. albovittata lives 



LASIOPTERA. Edged Midge. 



Z-. veiitralis. 

 L. vitis. ^\ 



J 



1 s 



in. ; blackish-brown, with yellow legs ; front edge of wing black, 

 red ; black head. On grape vines. 



(22) 



