HOW TO KNOW THE INSEQS 



This, of course, Is the adult stage. Insects which thus resemble 

 the adults as they grow up and change from the growing stage to 

 the adult stage without an Intervening resting stage are said to 

 have Incomplete metamorphosis. While In the growing stage they 

 are known as nymphs. 



Butterflies, house files, bees, beetles, etc. have com.plete 

 metamorphosis. The eggs hatch Into creatures but little. If at 

 all, resembling the parents. These are knoiATi as larvae. All 

 their growth Is made In the larval stage. During this growing 

 period the larva repeatedly molts. At Its last molt It assumes 

 a resting stage or pupa which may last only a few days or In 

 which months may be spent. V/hlle Inactive outwardly, some mar- 

 velous remodeling goes on Inside. Old structures are torn down 

 and rebuilt into v;holly different ones. Thus a slow-moving, 

 velvety green cabbage worm, equipped with heavy jav/s for eating 

 tough cabbage leaves, and a digestive system to handle such 

 coarse food, head with practically no eyes, three pairs of very 

 short, Jointed legs and five pairs of strong, hook-armoured, paddy 

 legs, finds a secluded spot, hangs itself by one end and changes 



Figure 4, The Pupae of Insects represent their resting stage, 



(a, Coleoptera; b, Diptera; c, Siphonaptera; 



.d, Lepidoptera; e, Hymenoptera.) 



Into an attractive chrysalis or pupa. From this resting stage 

 some ten days later It emerges an airy creature with four broadly 

 expanded v/lngs, six long slim legs, keen eyes, long antennae, a 

 long colled sucking tube to gather sweet ;]ulces, a digestive 

 system attuned to the new food and reproductive organs to ferti- 

 lize or produce several hundred eggs. 



Or taking the case of a beetle; - the flov:ers of goldenrod 

 form the favorite food for the locust long-horned wood-borer 

 ( Cyllene roblnae), and these beautiful yellow and black creatures 

 may often be found in large numbers on these flowers. This 

 goldenrod banquet makes a common gatherir;g place where m.ates are 

 found. When egg-laying time arrives, the female beetles hunt out 

 the common locust trees and tuck their white eggs in crevices of 

 the bark. These eggs hatch In about two weeks and the tiny grub 

 bores Its v/ay throug- the bark to the outer sap wood before cold 

 weather quiets It for the winter. Temperature has much to do 

 with the activity of these cold-blooded creatures. With the re- 

 turn of warm days the grub again becomes active and bores its way 

 around through both the sap wood and the heart wood. The wood is 

 its food. When growth Is complete it pupates In its well-protected 



