OF WASHINGTON, VOLUME XII, I'.llO. 19 



thirsty. Found always in low vegetation. Seems to prefer grass. 

 Does not enter dwellings to any extent, but comes into open 

 porches and is sometimes troublesome early in spring. Breeds 

 in clean, transient pools, preferring those in which there is grass 

 and other living vegetation. One of the early mosquitoes. 

 Taken in March, April, and throughout the summer, though not 

 so abundantly as earlier. Also in fall as late as December 15. 

 Some have the posterior tarsal claws toothed, while others 

 have them simple, but I see no other difference in the two. 

 Also from Mount Nebo. 



Aedes canadensis Theobald. 



Very scarce and local. Does not bite as readily as sylvestri*. 

 Habits and habitat appear about same as svlvestris, though 

 cttiunieiisis appears to like woods. Taken at about the same 

 time and in pretty much the same places as sylrcttris. 



Aedes thibaulti Dyar & Kuab. 



Very scarce here. I have taken only a few. In thickets 



and woods, also about dwellings and in buggies. Habits very 



little known. My specimens taken in April and May. Males 

 appear first. 



Aedes triseriatus Say. 



Abundant at times and very troublesome in thickets and 

 woods, also about houses. Comes into porches quite frequently, 

 though seldom entering dwellings. Bite is quite painful. 

 Breeds in tree-holes. Hibernates as larvae. Appears early 

 and is to be found throughout the spring, summer, and early 

 fall. Males appear first. I have them from Mount Nebo also. 



Aedes calopus Meigen. 



Habits mostly well known. Taken here only in and near 

 cities until 1908, when a few made their appearance at points 

 along the river bottoms a good way from Little Rock. Over- 

 flow probably accountable for this sudden spread. They do 

 not do very well in the country, except about dwellings. Are 

 summer mosquitoes, though sometimes taken as early as 

 April ; mostly from July to September. Never seen after cold 

 weather, though they are said to hibernate as adults. I 

 really believe that they are tropical mosquitoes and everything 

 goes to show that they have been brought here from farther 

 south. I have them also from Dardanelle and Mount Nebo, 

 Arkansas. 



