48 



the 

 -the 



showing 



larva 

 hair 

 the 



Fig. 26 shows 

 highly magnified 

 line on the side 

 natural size. 



Fig. 27 represents the fe- 

 male fly, with her four-pointed 

 ovipositor extended. At b we 

 I have the head highly magni- 

 fied, and c and d show the an- 

 tennae, and the ovipositor en- 

 larged. 



Fig. 28 is the male also 

 enlarged ; b, the head, c, the 

 peculiar clasping organs, and 

 d the pedunculated joints of 

 the antennae, which differ from 

 those of the female. 



Fig. 26. Larvae. 



Fig. 27. Female 



Grape-Vine Galls. 



We will now 

 refer to these 

 Cecidomyides 

 who produce 

 gall - like ex- 

 crescences on 

 the plants they 5 . 

 attack, and as^SfcF^ 

 specimens o f 

 their destruc- 

 tive work — we 

 refer to the 

 grape-vine galls. 



Fig. 29. Gall Fly. 

 The flies that cause these 



are not yet described, but they are very similar 



Fig. 30. Vitis Pomum. 



to that shown in Fig. 29, which is a willow 

 gall, known as Cecidomyia Strobiloides, O. 

 Sacken. 



Fig. 30 is the form known as the grape- 

 vine apple gall, Vitis-pomum, Walsh and 

 Riley. This gall is divided into numerous cells, each containing a larva. 

 Fig. 31 is the grape-vine filbert gall, Vitis-coryloides, Walsh and Riley. 

 Fig. 32 shows the grape leaf trumpet gall, Vitis-viticola, Osten Sacken. The colours 

 of these galls are bright crimson ; they are generally found on the upper' side of the leaf 

 — the galls are hollow, and contain a pale orange larva. 



Fig. 28. Male. 



