1 20 HEMII'TKRA-HKTEROPTERA. 



a pale asli color. The perfect insects have long nar- 

 row bodies. They are blackish brown above, and dirty 

 yellowish beneath. There are several broods each 

 season. They leave the plants in October, and hiber- 

 nate in the perfect state. 



TllRll'iD/E (Thrips). 



This family constitutes the order Thysanoptera of 

 authors. The insects comprising it are very minute, 

 rarely exceeding 2. 5 m. m. in length. The body is 

 long and linear ; wings narrow, membranous, furnished 

 with long cilia ; and laid horizontally on the back 

 when not in use ; mandibles setiform ; maxillae flat, 

 triangular, and furnished with palpi ; labial palpi also 

 present. 



These insects arc common on flowers, especially 

 daisies and clover. Their long bodies, and curious 

 habit of turning up their abdomens when frightened, 

 remind one of the smaller species of the Staphylinidae 

 Some species are beneficial, preying upon noxious in- 

 sects, others are injurious to vegetation. 



The Grass-eating Thrips, Limotlirips poapliagos Mss., 

 destroys the heads of timothy and June-grass. The 

 young insect pierces the stem just above the node 

 where it is tender, and, sucking the juice from it, 

 causes it to shrink and all the parts above the injury to 

 die. 



The Bed-bug, Ciincx Icctularis Linn. (Fam. Meni- 

 brancci), and the different species of lice, Pediculus, 

 (Fam. Pcdiciilina) arc low wingless forms, belonging to 

 this sub-order. 



