AQUATIC INSECTS IN NEW YORK STATE 455 



. The brown or pink micropylar projection is knobbed, and is 

 placed a little to one side of one end of the egg; otherwise the 

 egg is cylindric, with rounded ends [fig. 20]. 



Life history of Chauliodes 



The eggs were first found Ly the writer on the underside 

 of a boat landing built of wood, on the southeast shore of 

 Cayuga lake near Ithaca N. Y., June 14, 1899, while searching 

 for them. In this case there was but a single mass, freshly 

 deposited within two feet of the surface of the water. The 

 second lot, found June 16th in Coy glen, was composed of three 

 groups or clusters, each cluster being made up of about 30 or 

 40 egg masses. Each mass has from 1000 to 2000 eggs. These 

 were all within a radius of 2 feet on a large glacial rock, about 

 2 or 3 feet above running water. Farther up the glen in many 

 places I found single masses on small rocks overhanging the 

 water. Some of these were 10 or 15 feet above the water. In 

 one case a mass was found on an overhanging limb of a tree. 

 Mr A. D. MacGillivray has frequently found them on leaves and 

 limbs. Stones seem to be preferred by the adults when deposit- 

 ing their eggs. 



The hatching takes place at night, five or six days after the 

 eggs are deposited. The young larva breaks from the egg at 

 the end near the micropylar projection, which is the cephalic 

 end of the embryo, and readily finds its way to the water, usu- 

 ally by dropping directly from the egg mass or the object to 

 which it is attached. 



The freshly hatched insect differs from the more mature larva 

 in having the la4;eral filaments relatively much longer, and the 

 head larger; and the antennae only two segmented. 



The young are not very active and will remain in the portion 

 of the stream below the egg mass for several months or prob- 

 ably longer if not carried away by the strong current. A muddy 

 bottom is not distasteful to them, though they may be found 

 in many parts of our common streams; they are less frequently 

 found in the swiftest parts. The species (C. s e r r i c o r n i s ) 



