23 



Fig. 16. Thysanoptera. Onion thrips. 



(rt) adult ; (b) antenna of same ; (c) young larva ; (d) full-grown larva. 

 All greatly enlarged. (From U.S. Dept. Agric.) 



line hairs. The name of the order comes from the structure 

 of the wings, being derived from the two Greek words 

 thysanos, a tassel, and pteron, a wing. Fig. 16 shows young 

 and adult thrips, the latter with its delicate, fringed wings. 



Order III. Hemiptera. Half- Winged Insects. 



This order includes the true bugs, plant lice, scale 

 insects and several parasitic forms such as the bed bugs and 

 lice. The name of the order is derived from the Greek 

 words hemi, half, and pteron, a wing, in reference to the fact 

 that certain of these insects have the basal portion of the 



Fig. 17. Hemiptera. Leaf-footed plant bug. 

 Tti" Ice natural size. (From U.S. Dept. Aoric.) 



