1907 ENTOMOLOGICAL SOCIETY. 85 



1^ to nearly 2 inches. The ground colour of the forewings is ochre-yellow, 

 hut is heavily dusted with brown scales. On the forewings are five, more 

 or less, transverse bands, or rows of spots joined together. The outer two 

 rows of these are pearly, the others mostly the ground colour of the wings, 

 edged with brown. The hind wings are paler, semi-transparent, and without 

 any markings. The body is about the same colour as the wings, the shoulder 

 covers of the thorax being margined with brown on the inside. The male 

 differs from the female in being rather smaller and in the antennae being 

 more pectinate. 



The Spotted Halisidota Tussock Moth (Fig. 29), is a more conspicuous 

 looking moth. The forewings are also ochre-yellow, but are spotted with 

 blotches of 3ark brown, the outer of which forms a distinct band across the 

 wing. The other blotches form four partial transverse bands, the 2nd, 3rd 

 and 4th of which, in most specimens, join in the centre of the wing, forming 

 one large blotch. The hind wings are the same as those of H. caryce. The 

 body is of much the same colour as the forewings, and just behind the collar 

 are two oblique stripes, which converge and almost form a V-shaped mark. 

 In width of wing expanse, this species averages slightly more than the first 

 named species. The same differences occur between the males and females. 



As mentioned above, the caterpillars of these two Halisidota Tussock 

 Moths only appear late in the season, but, if another year they should again 

 occur in such numbers on trees of value which it was thought should be pro- 

 tected throughout the whole season, they could, of course, be easily destroyed 

 by spraying the trees with a poisonous arsenical spray, such as Paris green 

 one pound, fresh lime one pound, water 160 gallons. In apple or other 

 orchards which are regularly sprayed with the poisoned Bordeaux mixture, 

 little injury would be done by these and many other kinds of leaf -eating 

 caterpillars. 



ADDITIONAL INSECT GALIS OF ONTARIO. 



By Tennyson D. Jar vis, Ontario Agricultural College, Guelph. 



In last year's Annual Report,* I gave an account of a considerable num- 

 ber of Insect Galls found in Ontario. Further collections and investigations 

 have enabled me to add the following to the list : — 



DiPTERA. 



The Iris Leaf Gall. {Agromyza magnicornis) (Lowe). 



An oval enlargement on the inside of the leaf, usually about 1 in. from 

 the tip. Length ^-| in., width \ in., thickness, ^ in. Surface green, like 

 that of the rest of the leaf, except that it is somewhat whitened and withered 

 in appearance. The interior is composed of loose, parenchymatous tissues 

 separated from one another by many air cavities. In the centre is a single 

 chamber about ^ in. long and |^ in. in diameter. Where the gall occurs 

 the leaf broadens, but above the affected part it becomes distorted and dwarf- 

 ed. Larva, white. Pupa, dark brown. Occurs on the Blue Flag (Iris versi 

 color). Common. 



Aspen Egg Gall. (Agromyza ceneiventris , Fallen). Plate A., fig. 8. 



This gall resembles in external appearance the Egg Galls of the willow 



•Thirty-seventh Annual Report of the Entomological Society of Ontario, 1906, 

 pages 56-72. 



