GALLS OF CECIDOMYI^ ^ 297 



s,ny way differing from those which occur on J. 

 coynmiinis. 



2. Galls on Rosa spinosissima. — On the Ayrshire 

 coast I have found the stems (usually near the- 

 top) distorted and enlarged by what is no doubt 

 -a species of Cecidomyia. The swellings vary in 

 length and thickness ; some being nearly two 

 inches long, others not more than one-quarter 

 of an inch ; while in thickness they vary from 

 two to five lines, being as a rule thicker at the 

 ends than in the middle, when their length is over 

 half an inch. When the galls are of some length 

 they cause the twig to become bent, and it is very 

 seldom that the swellings themselves are not 

 twisted to a greater or less extent. Internally 

 they are woody, but not very firm in texture; and 

 the larvae do not live in clearly-defined cells. The 

 larvae are orange, and of the usual Cecidomyia 

 form. I have unfortunately not been able to rear 

 them to the imago state, and consequently I am 

 not in a position to say what species may form the 

 galls ; nor have I been able to find any record of 

 these galls being described anywhere. They are 

 to be found usually in near proximity to the galls 

 of Rhodites spinosissiTnce. 



3. An undescribed (?) gall on Latliyrus macrorrhizus, 

 — Mr. Peter Ewing gave me from the neighbour- 

 hood of Kinghorn, Fifeshire, a gall on Lathy rus 

 macrorrhizus which I cannot find described. It is 

 an irregular swelling, bent in the middle, having a 

 length of from 7 to 8 lines, and a breadth of from 

 4 to 5 lines. The outer surface is irregular and some- 

 what darker in colour than the stem of the plant. 

 Internally it is hard and woody. When I received 

 the gall it was too young, and did not yet contain 

 a grown larva. It is not unlike some of the 

 galls of Aidax hieracii found at the roots of 

 the Hieracia; and I am inclined to believe that 

 an Aulax may be the maker. 



