352 ENTOMOLOGICAL NEWS. [Oct., '08 



more or less reddish. Within this roll, the larva continues to feed, 

 extending the roll as it grows. Occasionally, a young larva feeds for 

 a time in a circle on the exposed surface of the leaf, causing it to become 

 reddish and wrinkled. By May 22, nearly all the leaves near the ground 

 show the rolls, which in some cases, nearly encircle the leaf, while in 

 others, they may be about one-quarter of an inch long. In one roll, 

 an inch long, twenty-five larvae were found ; while in others, only a 

 few were present. As a rule, the longer the roll, the fewer insects 

 they contain relatively. The insects remain in the larval stage through 

 the summer, becoming full grown by the last of September or first of 

 October, when all but those parasitized descend into the ground and 

 pupate to pass the winter. In exceptional cases, perfect larvae are not 

 able to escape from the roll in the fall, and so pass the winter in the 

 gall, emerging at the usual time in the spring through cracks or punc- 

 tures in the drier rolls. 



Parasites. This gallfly is attacked by a chalcid egg parasite which 

 appears at the same time in swarms almost as large as those of the host. 

 The female chalcid walks around among the Cecidomyia eggs touching 

 them rapidly with her antennae and stopping every now and then to 

 insert her ovipositor and lay an egg in one of the host eggs, but neg- 

 lects those surrounding it. 



A species of mite was also found to be very abundant under and 

 on the tree, and though it was not seen attacking eggs or larva, con- 

 ditions were such that it may be considered as possibly a parasite. 



EXPLANATION OF PLATE XIV. 



1. Lower side of leaf showing galls, half natural size. 



2. First stage of larva, not over six days old; just beginning to form 

 galls on oak leaves. X 190. 



3. Wing of C. foliora. X 25. 



4. Segment of antenna of male; greatly enlarged. 



5. "Wishbone" of full grown larva ; greatly enlarged. 

 6. Dorsal view of head of full grown larva ; greatly enlarged. 



MOSQUITOES INVADE CITY. Swarm Comes to Town and Plays Havoc 

 Before Storm. Just before the heavy storm last night a large swarm 

 of mosquitoes flew into the city and caused a great deal of annoyance 

 and plenty of work for physicians in the hospitals of the northeast 

 section. In about fifteen minutes after the swarm struck the city the 

 hospitals began to receive patients with their faces and hands so badly 

 swollen that it was necessary in some cases to lance them to draw out 

 the sting of the bite. On Girard Avenue, east of Belgrade Street, the 

 pests stripped all the trees of their leaves. After they had passed the 

 trees looked as though autumn had come. Philadelphia Press, July 

 24, 1908. [!!!] 



