DIPTERA. 



359 



Fi.i;. 326.— S/«)o/s o/Salix caproa 

 bji Cecidomyia rosaria. 



as in male; abdomen orange, with paler oviduct, and covers 1 with 

 black hairs ; legs uniformly dark- 

 brown, with greyish pubescence. 



Cecidomyia (Ehabdophaga) ROSARIA, 

 Lw. (Willow Eose-gall Midge).^ 



The galls caused by this insect 

 (fig. 326) are fairly common in 

 Xorthumberland, more especially in 

 the hilly districts, where there is 

 an abundance of scrub of the goat 

 Avillow (Salix eajjvea). The galls 

 may be found throughout the winter 

 months after every leaf has disap- 

 peai'L'd, and as many of the larvae 

 pupate within the gall, it is well to 

 collect them when dry for artificial 

 breeding. The insects appear about the middle of May, and deposit 

 their eggs in the terminal shoots. The gall very soon forms, as I have 

 found it by the first week in June. The gall itself is simply a rough 

 rosette of leaves formed in conse- 

 quence of growth being arrested. 



Adult insect, /e?«aZe.— Expanse 

 of wings about 6-8 mm. Anten- 

 nae lightish, inclining to grey on 

 upper side. Thorax greyish, 

 very hairy. Abdomen flesh-col- 

 oured, telescopic portion of seg- 

 ments very elastic, other por- 

 tions dark and hairy, under side 

 uniformly flesh - coloured, with 

 greyish silken hairs. Eyes black, 

 wings greyish, veins dark-grey. 

 Halteres light. Legs greyish, with red feet. 



J/aZ^.— Antennae greyish-black, and joints very hairy. Eyes black. 

 Base of wing flesh-coloured. Thorax darkish grey, hairy. Abdomen 

 uniformly grey, and hairy. Legs same as in $ . (Fig. 327.) 



^ In hatching out this species care should be taken to "select" the rosettes 

 only, apart from huds on the twigs, in consequence of there being another and 

 distinct species found within the buds. 





-Cecidomyia rosaria {iiiale). 



