MOSQUITOES 127 



yellow-fever blood came on a cargo from Central America to 

 New Orleans. The fever spread rapidly and by the middle of 

 September 2462 people had been attacked by the disease and 

 329 had died. Aedes is the common rain-barrel mosquito of 

 the South; it is frequently referred to as the "calico mos- 

 quito " because of conspicuous banding of its legs, thorax, 

 and abdomen with black and white. This mosquito is unable 

 to survive the winter of the Northern states (Fig. 63). 



FIG. 65. Outdoor laboratory work in a malarial district of the city 



Culex mosquitoes. To this genus belong our most common 

 household forms. They are generally brown and may be dis- 

 ti nguished from Anopheles by the fact that they rest with body 

 parallel to the plane of support and head and proboscis bent, 

 giving a humpbacked appearance. While these mosquitoes 

 are not known to be injurious to health, the annoyance and 

 distress they cause furnish ample reason for the general move- 

 ment to exterminate them. Culex pipiens is the common 

 household pest throughout the country. Howard says these 

 mosquitoes will not fly far from their breeding places unless 



