360 



FOREST ENTOMOLOGY. 



Cecioomyia (Rhabdophaga) saliciperda, Duf. 

 ("Willow-wood Midge). 



This species injures the stems, from two years old and upwards, of 

 several species of willow, and can therefore be readily distinguished 



from C. mlicitt, which confines 

 its attacks to young twigs. 

 In figs. 328 and 329 we have 

 a representation of the damage 

 done to a species from Kew 

 Gardens. Fig. 328 represents 

 a cross section of the stem, 

 showing the depth of the 

 injuries ; and fig. 329 repre- 

 very thin shaving or "slab" 



d by Cecidomyia saUcipeiJa. 



sents the damage as revealed by 

 taken off. 



As I I'eceived the specimens after the insects had hatched, I give 

 the following account from Dr E. 

 Stewart MacDougall : ^ — 



" This is a tiny fly, 2 to 3 mm. long (the 

 female is a little larger than the male), 

 with head and thorax black or black- 

 brown, and with black hairing. The 

 wings are milky white, with whitish hairs. 

 " The eggs, rounded and orange- 

 yellow, measure O'-tO mm. in length. 



" The larva is rounded at both ends, 

 or somewhat spindle-shaped. It has a 

 well - marked anchor process, and on 

 magnification little projections can be 

 st'i'n on the edge of the body, and warts 

 on the top of the body. 



" The pupa is bright yellow, the 

 limit of the wings reaching to ring -i and 

 the feet to ring 8. At the base of the 

 antenna two brown horns can be seen. 

 '• The females lay their eggs on Sali.c alba, S. fragilis, S. caprea, 

 S. purpurea, S. vi)ninal/f<, and exceptionally on white poplar. 

 ' Journal of the Association of Economic Biologists. 



Fig. Si^.-Purtion of hark awl irood 

 cut ojf to show the injuries of Ceci- 

 tloinyia saliciperda. 



