1906 ENTOMOLOGICAL SOCIETY. 69 



varies from 1.5 to 4.5 cm. in length, and from .8-1 cm. in width and .4-. 6 

 cm. in thickness. Through the gall runs a single chamber about 1 mm. in 

 diameter. The opening to the gall runs the whole length of the gall and is 

 on the upper side of the leaf. The opening is lined with minute white hairs. 

 In the gall are minute orange larvae about 1.6 mm. x .6 mm. -2 mm. Oc- 

 curs on Virginian Creeper (Ampelopsis quinque folia) . Common at Guelph. 



Midrib Gall on Touch-me-not. 



An enlargement of the petiole or midrib of the leaf, protruding on both 

 sides of it and averaging about 1 cm. in length x .4 cm. in width. Green, 

 smooth and monothalamous. A single chamber running the length of the 

 gall and containing several minute white larvae. Occurs on Touch-me-not 

 flmpatiens fulva). Common. 



Fruit Gall on Wood Nettles. 



This gall consists of a malformation of the fruit of the woodnettle and 

 sometimes all the fruiting stem is covered with them. The gall is juicy 

 and quite soft in structure and in shape is a long oval with a pointed apex 

 and sessile. The hypertrophy is variable, being sometimes mono and some- 

 times dithalamous. In the larval chamber, which is about 1 mm. in diam- 

 eter and surrounded by light colored tissue, are one or two small fat larvae 

 light brown i-n color. The larva is segmented and legless. The gall is about 

 .5 cm. in diameter and 1 cm. in length. It is green in color. Occurs on 

 Wood Nettle {Laportea Canadensis). Not common. 



Willow Egg Gall (Euura ovum). 

 Oval galls on the sides of the twigs of the Bush Willow. The galls are 

 hard and woody and usually the same color as the stem. Occurs on Bush 

 Willow (Salix sp.). Common. 



C -> 

 Dogwood Club Gall (Cecidomyia clavula). 



The galls are club-shaped and about 2 cm. in length. Inside is an 

 elongated channel containing a single larva. They are found on the ter- 

 minal twigs and the color is about the same as the bark. Occurs on 

 Flowering Dogwood (Cornus florida). Not common. 



Oak Spangles (Cecidomyia poculum). 

 Saucer-shaped galls in clusters on the under surface of the leaf. Usu- 

 ally pale red in color. Occurs on White Oak (Quercus alba). Common. 



Hymenoptera. 



Acraspis macTocarpa. 



This beautiful little gall occurs quite commonly upon the leaves of 

 Quercus macrocarpa in this vicinity. It is small, average diameter 3 m.m., 

 and in form globular to oval. Above, it is bright red, fading to yellowish 

 green near the base, where it is joined to the leaf by a small portion of the 

 surface so that it is easily detached without injuring the leaf. The surface 

 of the gall is netTed with innumerable fissures, between which are small ele- 

 vations with very short spines. When on the underside of the leaf the gall 

 is white in color. It is monothalamous and the smooth, hollow chamber 

 contains a single small white larva. The galls occur along the veins. 



They much resemble Cynips pisum,, but are monothalamous and also 

 resemble Cynips echinus, but the spines on this gall are scarcely noticeable 

 and Cynips echinus and Cynips pisum are both polythalamous. Occurs on 

 Burr Oak {Quercus macrocarpa). Common. 



