1906 ENTOMOLOGICAL SOCIETY. 67 



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Grape Vine Tube Gall {Cecidomyia viticola). 

 A long' conical, cylindrical tube-shaped gall, about .7-1 cm. in length 

 by 1.5-2 m.m. in diameter near the base, where it is attached to the leaf by 

 a slight constriction. It tapers to a point at the tip. Monothalamous, con- 

 taining several minute larvce. It is green or bright red in color and occurs 

 on the under side of the leaf. Occurs on Wild Grape (Vitis sp.). Not 

 rommon. _ 



Basswood Wart Gall {Cecidomyia verrucicola). 



Small swellings on leaf of basswood, appearing in May or June. About 

 3 m.m. in diameter, protruding from both sides of the leaf about 1 1-2 m.m. 

 The upper side has a dimple in the centre. Red above and green below. 

 Open in the fall by means of a circular lid upon the underside. Contains 

 small larvse. Occurs on Basswood (Tilia Americana). Very common. 



Burr Gall on Hawthorn (Cecidomyia bedeguar^. 



This is a small cylindrical gall, hollow, red or green in color, about 3 

 m.m. in height and diameter, and with a hole in the top of it. The top of 

 the gall around the hole is thickly s6t with spines, making the gall look 

 somewhat like a burr. Inside it are found many small orange-colored larvae 

 about 1.5 m.m. long. It is monothalamous and occurs on the upper side 

 of the leaf. Occurs on Hawthorn (Crataegus sp.). Common. 



Cherry Pocket Gall (Cecidomyia virgirnana). 

 This gall consists of a malformation of the fruit. The pit or stone is 

 absent and the fruit is enlarged, forming a thick-walled pouch about 1 cm. 

 in length by 5 m.m. in width by 1.5 m.m. in thickness. The gall contains 

 from 10 to 15 larvae. It has no opening, but later the fruit becomes loos- 

 ened from the peduncle and leaves an opening. The larvae leave the gall 

 in June or July. Occurs on Prumis virginiana. Very common. 



Ash Midrib Gall (Cecidomyia pellex). 



This gall is caused by a swelling and folding of the midrib of the leaf- 

 lets, the thickening being greatest at the midrib and extending towards the 

 edges of the leaf, often involving nearly the whole of it. The thickened 

 portion is folded together, giving the leaflet the appearance of a bean or 

 pea pod. A small cavity is left at the bottom of the gall which runs the 

 whole length. In this cavity are found minute larvae, feeding on the green 

 succulent tissue of which the gall is composed. The underside of the leaf 

 is always the outside of the gall. Occurs upon the leaflets of White Ash 

 (Frn.TJjnn Americana). Not common. _ , 



. . . . C\^U.^^ 



Box Elder Midrib Gall (Cecidomyia negundinis). 



Swellings on the midrib of the leaflets of the Box Elder, much resem- 

 bling Cecidomyia pellex on the White Ash. The swellings form two long- 

 circular chambers, one on either side of the midrib, opening on the upper 

 surface by slits running the whole length of the gall. Occurs on Box Elder 

 (Acer nequjido). Not common. 



Ball Gall on Hichory (Diplosts caryw). 



Thin-walled galls, about 3 m.m. in diameter, hard and brfttle, attached 



to the underside of the leaves of Carya alha by a projection at the base, 



which appears upon the upper side as a black dot, surrounded by a light 



yellow areola. The gall has no opening and contains a very small larva. 



; The hypertrophy is monothalamous. The exterior of the gall is smooth or 



■ slightly pubescent. Occurs on Carya alba. Common. 



