Tech. Series 21, Bureau of Entomology, U. S. Dept, of Agriculture. 



Plate IV. 



North American Thysanoptera. 



Fig. 23. — Evfhn'ps2>a''^'>i'^: Headiiiid tlioraxof ft'imilo, dorsal view. Fig. 24.—Kiilhnpx]inn'us: 

 Tip of abdomen of female, dorsal view. Fig. 2.'i.— A'H</(ry>,s parvus: Right fore wing of 

 female. Fig. 26. — Euthrips hcUanthi: Head and prothorax of female, dorsal view. Fig. 27.— 

 EiithriiiK hilinnthi: Tip of abdomen of female, dorsal view. Fig. 2S. — Euthrips hdianthi: 

 Right antenna of female. Yxa.'l'i.—EiitlirijixhcUantlii: Right fore wing. Fig. SO.— Euthrips 

 albu.t: Right antenna of female. (Original.) 



