MOSOriTOES 



131 



Its respiratory tube is short, its bmly black and spotted witli 

 tufts of long bristles protruding from tlie sides (Fig. 02). The 

 [)upie of the different species are not readily <listinguishcd. 

 Under favorable conditions the time recjuircd for the eggs to 

 hatch and grow to adult mosquitoes is ten days : w lu-n the 

 weather is cold it may be indelinitely 

 extended. Three days after emergence 

 the adult may lay eggs. Cidex has pro- 

 duced from seven to ten generations in 

 a season and Anopheles four. Allowing 

 150 eggs to a generation, the possible 

 progeny of a pair of Anopheles in one 

 season would be 31,000,000. The natu- 

 ral enemies of immature mosquitoes are 

 fishes, newts, salamanders, dragon-fly 

 nymphs, the larvae of water beetles, and 

 even young turtles. 



Location of breeding places. After 

 members of the class have learned to 

 distinguish the different mosquitoes and 

 their larva? at a glance, they should 

 divide themselves into groups corre- 

 sponding to convenient divisions of tlie 

 district to be studied. Each group should 

 be responsible for a full report upon the 

 breeding places and the kind of mosqui- 

 toes found in its territory. Collect speci- 

 mens and put the eggs, larvas and pupjc 

 from each territory into separate glasses 



or into vivaria with screen tops (Fig. GO). Keei) a dish of 

 water and a bit of fruit (apple, grape, l)anana) in the vivaria 

 for the adults and have green alga- in the water with the 

 larvfie. Catch full-fe(l mosquitoes about animals cr in bed- 

 rooms and keep in glasses arranged as sliown in lig. <••• 



Fi<;. (iS. liLsccl-ciitching 

 bottle 



Ftir handlinj; tl»'li«'at»' in- 

 sects this is l)»*tt«'r tiiaii a 

 lu't. The t'ssfiitial fraiun- 

 is a paper eone oi>eiiiii;; iti- 

 wanlthroiijihthethiueork 



