12 



AMERICAN MUSEUM GUIDE LEAFLETS 



In the "egg-boats" of Giles the rounded end of each egg is directed 





^7 



STAR SHAPED ARRANGEMENT PONTOON BRIDGE ARRANGEMENT 



/TIER GRA.'iSi 

 FIG .6. EGGS OF THE MALARIA MOSQUITO 



Characteristic arrangements on the surface of the water. Magnification 7 diameters. 



downward and the larva' escape into the water from the lower surface 

 of the Heat (Fig. 7). 



The Larva. 



Mosquito larva- are popularly km.wn as "wigglers" or "wrigglers," 

 because of their peculiar motions in swimming. At the time of hatch- 

 ing, the larvae of the 

 Malaria Mosquito are 

 minute. The trans- 

 parent body is cylin- 

 drical and is exceeded 

 in diameter by the 

 small, 1) ni w n i s li, 

 r Oil n d ed Divisions 

 head. A> of the 



soon as freed body 



from the egg the larva 

 begins to feed. It 

 grows rapidly, and. if 

 the food supply is 

 abundant and the tem- 

 perature of the water 

 is not too low, it at- 

 tains its full size in a 

 few days. The body is divided into the head, the thorax and the 

 cylindrical abdomen of nine rings or segments (Fig. 8). In a newly 



fig 7. MOSQUITO LARV/E {Cnlex pipiens Linn.) 



HATCHING FROM AN EGG-RAFT 



The <--<•: 1 1 >i i i>r larvse arc carrying on their 

 heads the cap-like lower ends of the egg shells. 

 These caps may be seen attached, like hinged lids, 

 to some of the egp;^ of the raft, and this is the 

 usual condition. The egg-raft was in this case 

 disturbed, and the instant and simultaneous 

 hatching of the larvse occurred with such sudden 

 violence that the lid-, were carried away on the 

 larva heads. Magnification about 1- diameters. 



