OF WASHINGTON, VOI.UMK XII, !ll|ll. 21 



Culex territans Walker. 



Rather abundant early iu the year in suitable places. Found 

 in low vegetation in woods and about houses. Breeds in any 

 accumulation of water. Prefers rain-barrels and transient 

 pools, along with restuans and quinquefasciatus. Very seldom 

 enters dwellings ; does not bite, so far as I know. An early 

 species, becoming scarce in summer. Taken in March, April, 

 and May; then again in September and October. 



Culex restuans Theobald. 



The very commonest mosquito about houses, but I believe 

 wrongly accused of being a biter of man. It is an early species 

 here and is replaced later by (\ quinquefasciatus, which is the 

 real culprit. Habits well known. Taken here last of March, 

 April, May, and first of June; then again in fall. Does not 

 bite human beings very much, though it enters dwellings. 

 Seems to prefer poultry and live stock, also juices of plants. 



Culex quinquefusciatus Say. 



Found about dwellings. Very abundant. Puts in its ap- 

 pearance generally after restuans has disappeared. Enters 

 dwellings readily and bites always, though mostly at night. 

 Breeds in any water, even very foul, and in fact seems to pre- 

 fer filthy water. So far as I can see this species is the cause of 

 most of the charges laid \.o pipiens. Taken here May, June, 

 July, August, September, and October; mostly in July and 

 August. 



Psorophora ciliata Fabricius. 



Most abundant of the two Psorophora here. Sometimes 

 locally quite abundant. A fierce biter, entering dwellings, 

 most 1 )' at night, seemingly attracted to the lights, though it 

 never fails to bite when indoors. Breeds in large marshes and 

 also local transient pools. Prefers open fields to woods, though 

 often found in both places. Taken in May, June, Jnl\ T , Aug- 

 ust, and September; mostly in July and August. 



Psorophora howardii Coquillett. 



Not as abundant as ciliata. Habits about the same. Breeds 

 in same places. Is an eager biter also. Both species bite 

 either day or night. Taken at the same time as riliaia and 

 in same places. 



