ODONATA — THYSANOPTERA 
Pig. 21.— Adult dragon fly. Original. 
membranous wings. Each wing is marked with a shallow notch about 
midway along its front margin. Adults as well as nymphs are pre- 
dacious, living on other inseets which they 
capture. Their mouth parts are of the biting 
type. They have large compound eves, — as, 
indeed, we should expeet in insects that live by 
capturing others. The abdomen is slim, and 
is never provided with a sting of any sort, as 
is so often supposed. 
Insects of this order are of importanee be- 
eause they make a business of capturing in- 
dividuals of other species, many of which we 
may reasonably assume would be injurious. 
The order has been carefully studied, and 
about 2000 species have been deseribed. 
Thysanoptera 
The group to which has been given. this 
name is made up of very small inseets, many 
Fic. 
2?. — The empty 
pupal skin of a dragon 
fly. 
Original. 
of whieh the layman will recognize rather by their characteristic work 
than by acquaintance with the appearance of the insect itself. Their 
common name is‘ Thrips.” 
