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



Plate 111. 



^TTTTt 





North American Thysanoptera. 



Fig. 16.—Echiiwtlirips meTicanus: Head lUid thorax of female, dorsal view. Fig. \l.—Echino- 

 tbripx wcxiraniis: Tip of abdomen of female, dorsal view. Fig. \S.—Ecliinothn'pi< mceicavKs: 

 Kislit fore wing of female. Fig. V^.—Krliitiotlirip." mej'icantiK: Right antenna. Fig. 20.— 

 Eiithripx alhiis: Head and prothorax of female, dorsal view. Fi.ir. ^l.—EiitliripK (illni.-:- Tip of 

 abdomen of female, dorsal view. Fig. ^-l.—Eutlirip:? atbiDi: Right fore wing. (Original.) 



