342 



COLLEGE ZOOLOGY 



Fig. 267. — Order Thvsanoptera. Pear 

 thrips, Euthrips pyri. (From Moulton, Bui. 

 80, Bur. Ent., U. S. Dept. Agric.) 



and consequently weak 

 and thin. Chickens take 

 dust baths to rid them- 

 selves of Menopon pal- 

 lidum (Fig. 266), the most 

 common species. 



Order 8. Thvsanop- 

 tera. — Thrips (Fig. 267). 

 — Insects with four 

 narrow, membranous 

 wings fringed with long 

 hairs; mouth-parts inter- 

 mediate ; the metamor- 

 phosis transitional, not 

 complete, but a quiescent 

 stage occurs. 



The feet of these insects are without claws, their place being 

 taken by bladders adapted for clinging to 

 leaves or flowers. The males are not com- 

 mon, since parthenogenesis is the usual 

 method of reproduction. Several species 

 are distinct pests; these are the onion- thrips 

 {Thrips tabaci), the wheat-thrips {Euthrips 

 tritici), the grass- thrips {Anaphothrips stri- 

 atals), and the fruit thrips {Euthrips pyri) 

 (Fig. 267). 



Order 9. Euplexoptera. — Earwigs (Fig. 

 268). — Insects usually with four wings; 

 fore-wings leathery, small, and veinless; 

 biting mouth-parts; posterior end of ab- 

 domen bears pair of forceps; metamorphosis 

 incomplete. 



This order contains the family Forfi- 

 CULID.E. The earwigs are not common in 

 North America. They feed at night on fruit 



Fig. 268. — Order 

 Euplexoptera. Ear- 

 wig, Anisolabis mari- 

 tima. (From Daven- 

 port.) 



