NATURAL HISTORY SOCIETY OF GLASGOW. 185 



growing, and form into pseudo-galls, resembling great buds, 

 three or four inches long, — states, that happening to open one of 

 these galls, he saw plenty of the minute orange-coloured larvae of 

 a Cecidomyia. 



The larvae of a Continental species, C. lycJinidis, Heyd., live 

 gregariously in deformed, woolly, leaf and terminal buds oi Lychnis 

 dioica, and we may possibly find the above two forms are to be 

 referred to it. 



Angelica sylvestris, Lin. — About the middle of September, I 

 observed, among the umbels of this plant in Mugdock Wood, 

 numerous flowers conspicuously larger than the rest. Closer 

 inspection showed that the carpels were swollen and pinkish in 

 colour j the petals were somewhat fleshy, and had not unfolded ; 

 stamens were present, but the styles of the pistil seemed aborted. 

 The length of the galled flower was scarcely two lines. 



In each galled flower was a single larva, colour bright orange- 

 yellow, length three-quarters of a line to nearly one line, last seg- 

 ment emarginate, on each projection a number of bristles seated 

 on tubercles, similarly to others on different parts of the body. 



The larva inhabits the cup of the flower, and not the carpel, as 

 I ascertained by very careful examination. 



I made a slight reference to this gall in a previous paper on the 

 genus Aspliondylia ; and as I stated, it will probably turn out to 

 be the work of A. imnijinellae, Fr. Lw., which forms galls 

 resembling these on Fimpinella saxifraga, Lin., and the galls of 

 which species Mr Traill (Scot. Nat., i, p. 125) has recorded for 

 Scotland. 



Similar malformations of the flower have been observed in 

 various other umbelliferous plants, as Pastinaca sativa, Lin., 

 Daucus carota, Lin., and others, all most likely to be referred to 

 the same insect. But in all these forms, so far as known, the 

 larva seems to inhabit the carpel and not the flower-cup. 



Having this fact before me, I was careful to assure myself of 

 its true position in the examples I have met with on Angelica. 



In the discussion which followed the reading of this Paper, Mr 

 Peter Cameron stated that he had first found the larvae of 

 Cecidomyia quercik on the banks of the Clyde, near Newton, in 

 abortive acorns, in wliich several lived in company, and their 

 presence caused the cup to become split and twisted. It seems 



