240 ELEMENTARY STUDIES IN INSECT LIFE 



tion, for the nymphs to ascend and cling to while molt- 

 ing. 



Some Points for Observation. - The time of appearance 

 of wing-pads ; the time of day when the molt takes 

 place ; the color-markings of the insect hef ore molting 

 and after molting ; the number of molts ; date of 

 maturity ; relative positions of the narrow wing-pad 

 and the wide wing-pad in the nymph, and of the nar- 

 row \viiiiis (the tegmina) and of the wings in the adult; 

 time, manner and place of ovi position. As the work de- 

 velops the student will find main- other interesting facts 

 to increase the volume of his notes. 



THE DRAGON-PLY 



The study of tin- development and growth of the 

 grasshopper familiarizes us with the incomplete meta- 

 morphosis of an insect which passes its whole life on 

 land. jVlany insects spend a part of their existence in 

 the water. The dragon-flies are insects with incomplete 

 metamorphosis. 



To rear these insects is not a difficult task. In the 

 rearing many delightful as well as instructive observa- 

 tions will be made. The first thing to do is to obtain 

 the insects. Each group of dragon-flies has its own 

 peculiar place. The nymphs and it is these we will 

 seek to find --of one division (Gomphince) live in the 

 sediment at the bottom of pools, frequently pools with 

 little or no vegetation on the bottom. Two other di- 

 visions (Agrioiiintt' and Arxclniiiiw} are to be found 

 among submerged vegetation. 



Since all of these live for a considerable length of 

 time in the water, permanent pools and streams will 



