126 



CIVIC BIOLOGY 



glance by its mottled wings and by its posture. It resembles 

 somewhat a thorn in the wall, standing as it does at an angle 

 of almost ninety degrees to the surface, with proboscis in line 

 with the body, whether the surface is vertical or horizontal. 



Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec.. 



1897 



1900 



1898- 1900-1901- 



FIG. 64. Yellow fever in Havana 



Aedes calopus. This is the mosquito responsible for the 

 transmission of yellow fever, which in the memory of man has 

 left its dead unburied in some parts of our country. Indeed, in 

 the early part of the summer of 1905 a mosquito infected with 



