10 



INSECTS INJURIOUS TO VEGETABLES 



Suborder Physopoda. — The thrips have two pairs of wings 

 of similar form — long, narrow, membranous, not folded, and 



Fig. 13-— Brown v>'^Sir\\-h\x^(Euschistus variolarius). Adult at right; last 

 nymph stage at left. Enlarged. (Howard. U. S. Dept. Agr.) 



with few or no veins. These are fringed with long hairs and 

 do not fold, but are laid horizontally along the back when at 

 rest' (fig. 15)- 



Neuroptera. — This order 

 has been subdivided by re- 

 cent writers into numerous 

 other orders, but as they are 

 of comparatively little if any 

 economic importance, these 



Fig. 14-.— An aphis. Much enlarged 



Fig. 15.— Enthn'ps Mtici. a, Adult thrips; 

 b. antenna; c, leg. All highly magnified. 

 (After Hubbard, U. S. Dept. Agr.) 



subdivisions need not be discussed here. The Neuroptera, in 

 fact, have served as a "catch-all" for the groups that could not 



1 .\ccording to recent classification the Physopoda constitute a distinct order, 

 but the Parasitica, which includes the parasites of man and other mammals, 

 is a suborder of equal rank with the Heteroptera and Homoptera. 



