FLIES, MOSQUITOES, AND MIDGES 



221 



having a wing expanse of from one and one half to two inches. 

 The giant crane-fly (Holorusia rubiginosa), of California, is the 



FIG. 349. Anopheles mosquito and malaria 



a, larva ; t>, pupa ; r, adult : d, the blast introduced into the blood by the mosquito ; e to /, 

 stages through which the plasmodium passes in the red blood corpuscle ; /, the spores 

 which enter new blood corpuscles ; /, m, the microgamete ; n, o, the macrogamete ; /, 

 flagellas forming ; g, union of a flagellum with macrogamete ; r, fusion of nuclei ; s, the 

 vermicule ; / to y, formation of the zygote in the mosquito stomach, the fully developed 

 zygote, j, rupturing to produce blasts. (After J. B. Smith) 



largest species of the order, being two inches long and the legs 

 spreading some four inches. What advantage the crane-flies derive 

 from their size is a question, as they are very awkward and fragile. 



