THE LIFE PROCESS IN INSECTS. 93 



It should be noted also, in comparison of larva and imago, 

 that there is an entire change of life habits and of instincts. 

 That there is no traceable connection between the instincts 

 of the larva and those of the adult, is an interesting fact. 



PUPA (x 3) : h, head; e, eye case; th, thorax; ant, antenna case; tc, tongue 

 case; Ic, cases of front and middle legs; we, wing cases; sp, spiracles; 

 a, abdomen ; cr, cremaster. 



Butterflies and moths constitute the group Lepidoptera 

 (or scaly-winged insects). Capture a few of the moths 

 that are attracted to a light at night, and examine them, 

 to discover wherein moths differ from butterflies. 



THE LIFE PROCESS IN INSECTS. 



I. Nutrition. The food of insects is so various, that 

 diverse organs are necessary for seizing and preparing it 

 for digestion. The mouth parts normally present are 

 (1) a labrum; (2) a pair of mandibles; (3) a pair of max- 

 illae, each with three free appendages, lacinia, galea, 

 and palpus ; and (4) a labium, with its jointed palpi. 

 Any of these parts may be specialized, modified, or sup- 

 pressed, according to the needs of the animal. 



