1904 ENTOMOLOGICAL SOCIETY. 93 



Among the interesting things that affect the oak are the Cynipidos. You 

 will remember that on one of our field days we visited the country-house 

 of our friends, Mr. and Mrs. Morgan, on the Island of Orleans; and that 

 our attention was drawn to the woolly galls upon the oak trees around it, 

 and to the curious beetles, Balaninus rectus, tSay, that we shook in such 

 numbers from the branches. 



Galls of the kind mentioned are formed by the four-winged fly, Calli- 

 rhytis seminator, Harris. They are polythalamous, each being made up of 

 distinct cells with flocculent matter attached. The flies that come from 

 them differ in the sexes. The males are shining black, with tawny yellow 

 legs and antennae; the females have the head and thorax cinnamon red. 



A remarkable gall that I have found on oaks, near Montreal, is that 

 of Amphiholips inanis, 0. S. It is produced on the red oak, and comes 

 to maturity in June. When opened at this time it is found to consist of 

 a mere shell with a central chamber, held in place by radiating filaments. 

 The fly makes its way from this central chamber, bites a round hole, in the 

 outer rind, and so escapes. 



A variety of larvae, both of moths and butterflies, feed upon the leaves 

 of the oak. The most injurious of these is the Forest Tent-caterpillar, the 

 larva of Clisiocampa disstria, Hbn., (Fig. 15.,) which spins a cob-web like 



Fig. 15. Forest Tent-caterpillar. 



nest against the sides of the tree, and swarms along the branches, stripping 

 them of their foliage. 



This caterpillar must not be confounded with that of the Cliswcampa 

 Americana, Fabr., of the orchard. It differs from it in several respects. 

 One of these is easily remembered. The larva of C. disstria has a row of 

 white spots along the back, that of C. Americana has a white stripe. 



The largest larvae that sometimes feed on the oak are those of the hand- 

 some Saturnian, Attacus Cecropia, Lin, and the no less handsome Telea 

 folyphemus, Cram., beautiful larvae feeding on the oak, and well worthy 

 of observation are those of : 



Anisota pellucida, Hubner. 



Halisidota tessellaris, A. and S. 



Halisidota maculata, Harr. 



Edema alhifrons, A. and S. 



Several kinds of oak-feeding larvae are stingers : 



Hemileuca maia, Drury. 



Lagoa crispata, Pack. 



Phohetron pithecium. A. and S. 



Sibine stim^vlea, Clem. 



Of these the only one I have found at Quebec is Phohetron pithecium, 

 the 8-flapped slug-worm. 



Of butterfly larvae that are found on the oak, these may ut; mentioned : 



Limenitis disippus, Godt. 



Thecia calanus, Hbn. 



Nisoniades brizo Bois., Lee, and occasionally Papilio turnus, Linn. 



These are all found in the neighborhood of Quebec. 



