Notes on the Commoner Species 187 



enormously developed, being about half the length 

 of the larva itself, and are well tracheated, obviating 

 any necessity for surface breathing. The insects 

 apparently dislike to rise from the bottom, and if 

 chased up, dive down as soon as possible. They 

 avoid the light, hiding among the debris. The 

 pupa stage is less than twenty-four hours. The 

 adult lives twelve days, and can exist for eight days 

 on water alone. 



Ochlerotatus triseriatus. — This species has the 

 curious habit of breeding in tree holes ( Fig. 6, b, 

 page 31). It ranges from New York to Louisiana, 

 and while a hard biter, and by no means rare, can 

 scarcely be classed as a nuisance. It is not found in 

 the houses, though sometimes it comes on sheltered 

 porches of homes in groves or near woods, but it 

 does not fly far. The time of day does not seem to 

 affect its biting if it is hungry. Its bites used to 

 raise white lumps on me, not painful, however, after 

 I had become immune to most of the rest, but on 

 Dr. Dupree it never seemed to have any effect. We 

 generally caught the adults about half an hour be- 

 fore sundown, captures being made from March 2 i 

 to October 11 — earlier, though not later, than in 

 New Jersey. They fed once to four times before, 

 and sometimes once after, laying, but usually died 

 immediately after oviposition. One batch seemed 

 to be the rule. In New Jersey the eggs have fre- 

 quently been collected in tree stump holes, Mr. 

 Brakeley finding them also in an iron kettle, at the 

 sides and above the then surface. The ova were de- 

 posited in the laboratory from three to twelve days 



