CLASSIFICATION OF INSECTS. 



words : physao, to blow up, and pous, a foot. It re- 

 fers to the curious bladderlike feet of these insects. 



The species of thrips are very 

 minute insects. Fig. 57 represents 

 one of them greatly enlarged, with 

 the wings of one side spread. They 

 can be easily found by pulling to 

 pieces the blossoms of clover or 

 daisies. Some species are black, 

 others are light brown. The wing- 

 less nymphs of our common black 

 species are bright red. FlG - 57> ~ A thn P s - 



Order HEMIPTERA (He-mip'te-ra). 

 >ugs, Lice, Aphids, and others. 



The winged members of this order have four wings ; 

 in one suborder the first pair of wings are thickened 

 at the base, with thinner extremities which overlap 

 on the back ; in another suborder the first pair of 

 wings are of the same thickness throughout, and usu- 

 ally slope at the sides of the body. TJie mouth-parts 

 are formed for sucking. The metamorphosis is incom- 

 plete. 



The name Hemiptera is from two Greek words: 

 hemi, half, and pteron, a wing. It was suggested by 

 the form of the first pair of wings in the true bugs. 

 Here the basal half of these organs is thickened 

 somewhat like the wing covers of beetles, only the 

 terminal half being winglike. The second pair ot 

 wings are membranous, and when at rest are folded 

 beneath the first pair. 



Within this order are grouped insects that differ 

 greatly in form and appearance. These are dis- 

 6 



