APT. 18. 



NOTES ON CYNIPID WASPS WELD. 



11 



type, known by such common names as " pea," " hedgehog," " spiny 

 oak gall," being hard globular or elongated galls attached to the sur- 

 face of the leaf, reticulate on the outside or rough with points or 

 spines and containing one, two, or several larval chambers without 

 an inner cell. The flies emerge late in the fall, usually before the 



Fig. 2. Philonix gigas, new speciks. Hypoptgium and mesonotum. 



leaves drop (and in one known instance oviposit at once in the buds)- 

 the galls remaining attached to the leaves and dropping with them. 

 The only Philo7iix galls known are of quite a different type. They 

 are fleshy, globular, slightly attached to the under surface of the leaf, 

 with a thick pithy wall covered with a short dense felt-like pubescence 

 looldng as though it had been rolled in road dust. Inside there is a 



Fig. 3. — Acraspis pezomaciioides (Osten Sacken). Dorsal and side views of meso- 

 notum AND HYPOPYGIUM. 



single thin inner cell surrounded and supported by a ilense layer of 

 dark-brown radiating fibers. They drop to the ground in September 

 and October long before the leaves, and some larvae transform into 

 adults which emerge later the same season in November and December 

 and others not until the next spring. Other larvae do not transform 



