88 THE REPORT OF THE No. 19 



usually causes the stem to bend at the infested point. Common in some 

 localities near Guelph. 



Lunate Marginal Gall. (Choristoneura flavoliinata, Felt). Plate A, 



fig- 6. 



Circular or somewhat irregularly elliptical spot-like galls only project- 

 ing very slightly from each side of the leaf. They are about 1-5 — 2-5 inch 

 in diameter, the main part of the spot is light colored (usually yellowish), 

 this being enclosed by a dark ring, thus giving it some resemblance to an 

 eye. The galls are glabrous and monothalamous, the larvse feeding on the 

 internal tissue of the leaf without causing much projection from within. 

 Usually not more than 1 to 2 spots on each leaf. Occurs on Solidago Cana- 

 densis. Common at Guelph. 



Blackberry Leaf Gall, {Cecidomyia farinosa, O.jS.). 



Consists of woody swellings at the base of the leaflets or on the midrib 

 of the blackberry. The larvae are purplish in color. Rare at Guelph. 



Boneset Stem Gall (Choris^toneura jjerfoliafa, Felt.) Plate A, fig. 5. 



Consists of oval swellings of the stems and leaf stalks. When mature, 

 the enlargement is about twice the normal size of the stem. The gall is 

 monothalamous and contains red larvse. Fairly common at Guelph. 



Spiraea Pod Gall {Cecidonnyia salicifolice, O. S.). 



The Pod Gall of the Meadow Sweet is found not only on Spircea salici- 

 folia but also on S. tomentosa and S. hetulcefolia. It is quite similar in 

 shape and appearance on all three, and in each it is found on the under sur- 

 face of the leaf as stated in Entomological Report of 1906, page 68. 



Golden-rod Gall (Trypeta polita, Loew). 



Consists of a bunch of dwarfed leaves caused by the arrest of the growth 

 of the branches. It is a little more than half an inch in length. The larva 

 lives at the base of the gall. Fairly common at Guelph. On Golden-rod 

 (Solidago Canadensis). 



Hymenoptera. 



The Large Spiny Rose Gall (RJiodites multispinosus. Gill). Plate B, 

 fig- 3. 



This gall, when mature, is oblong or sometimes ovate in shape, and is 

 found on the stem and the branches. It averages 1 to 2 in. in length and | 

 to 1 in. in thickness in the widest part. The surface is covered wath numer- 

 ous spines or prickles about \ in. long and is light brown colored. The sur- 

 face of the gall itself is somewhat rough and irregular, with depressions and 

 elevations sometimes of considerable size. Moreover, after the gall-insects 

 have emerged it is perforated with from 30 to 50 small, circular apertures, 

 each about 1.5 mm. in diameter. The color of the gall is a dull gray. Its 

 texture is firm, hard, brown colored, and granular. The gall is polythala- 

 mous, containing from 30 to 50 chambers, each about 3 to 5 mm. long and 2 

 mm. wide and arrans-pd more or less radially along the longitudinal axis. 

 When mature, the gall-insects make a tunnel from these to the surface. The 

 adult insect is a Cynipid about \ inch long with reddish colored head, thorax 

 and abdomen. The gall occurs on the Wild Rose. Rare ; Niagara District 

 and Toronto. 



Cinquefoil Axil Gall (Diastrophus potentilhr, Bass). Plate B. fig. 5. 



The gall is spherical or oval in shape, from i to A inch in diameter and 

 about h inch long, and is borne on a slightly curved peduncle 3-5 to | inch 

 long arising in the axil of the leaves. The gall is spongy in texture, with a 

 solitary central chamber containing the white curved larva which is about 

 3 mm. in length. The gall is green in summer, reddish brown in winter. 

 Occurs on PofentrUa Caimdensi^. Rare in Eastern Ontario. 



