OF WASHINGTON, VOLUME XII, 1!J10. 15 



found, so that the water had free passage and the pond weeds 

 found no foothold, except very near the banks, where the}' 

 were completely destroyed by stock. After the launches 

 stopped passing through this bayou, logs soon accumulated 

 and the pond weeds immediately took possession, so that 

 throughout the present season quadrimaculatus and abomi- 

 nator have bred continuously and abundantly in this bayou. 



It must be noted in passing that the larvae, pupae, and 

 freshly emerged adults bred in such a location are invariably 

 bright grassy green in color, which gives them additional ad- 

 vantage of the fishes. This is not the case with larvae, etc., 

 found in other places. 



HOW MOSQUITOES ARK CARRIED FROM PLACE TO PLACE. 



How mosquitoes are carried about by railway trains, steam- 

 ships, and the smaller river boats has been mentioned by vari- 

 ous writers and need not be repeated here; but the important 

 part played in mosquito dissemination by smaller convey- 

 ances has, it seems, been overlooked for the most part. I must 

 not fail to mention in these brief notes that mosquitoes are 

 constantly being transported over the country by buggies, 

 covered wagons, and, even in the case of Aedes evanescent, 

 on the backs of horses; and I must add that the} 7 are carried 

 for considerable distances, too. I have known Anopheles 

 ijnadrimaculatus and Culex abominator to be quite frequently 

 carried 40 miles in a day, and as they will not leave a vehicle 

 while it is in motion, it will be seen that they may travel 

 even greater distances. Aedes cvanescens is the only species 

 that travels extensively on horses or other animals ; likewise 

 the only species which never voluntarily quits biting, once it 

 has started. This is why it is so frequently carried from 

 place to place on live stock. 



I have found the following species to travel in buggies, etc: 



Anopheles quadrimaculatus Say (constantly). 



Culer abominator D & K. (constantly). 



Culex quinquefasciatus Say (very often). 



Culex restuans Theob. (very often). 



Aedes cyanescens Coq. (very often). 



Anopheles punctipennis Say (very often). 



Anopheles crucians Wied (seldom). 



Coelodiazesis barberi Coq. (seldom). 



Culex tarsalis Coq. (seldom). 



Mansonia pertitrbans Walk, (often). 



Culex peccator D. & K. (once only, male). 



Acdes calopus Meig. (quite often). 



Aedes thibaulti D. & K. (twice only, male and female). 



