12 THE ENTOMOLOGIST. 



thought that a mile might be saved by going over hedge and 

 ditcli : the hedges we either got over or through, but the 

 ditches mastered us; they were too wide to jump, and too 

 wet to get near enough to try. After walking through hay- 

 fields and cornfields to get to a bridge we were thoroughly 

 knocked up ; and darkness setting in, and not knowing the 

 district, we were heartily glad to see a light and hear a dog 

 bark, and to get into Flookburgh again. The people at the 

 inn had given us up for the night. There was another 

 unpleasant look out: the fields there are half a mile across, 

 and not a few bulls about ; their company was certainly not 

 desired by us in the darkness, when we could not see where 

 the hedges were. 



Here for the first time on the marshes Colias Edusa was 

 to be seen : one female was sitting quietly on a plant of 

 Lotus corniculalus, no doubt laying its eggs; now and 

 again it kept walking round, as 1 have often noticed butter- 

 flies, as though wanting to be quite sure it was the right 

 plant to lay on, Leucophasia Sinapis (the wood-white) over 

 and over again settles on various plants, but does not attempt 

 to lay on any other but the Lotus; it seems to be quite 

 engrossed in its examination. Js it sight or smell that 

 dictates its nidgment, if 1 may so call it? 

 (To be continued.) 



ON THE DEVELOPMENT OF GALLS OF 

 CECIDOMYIA ULMARI^. 



By E. A. Ormerod. 



The cecidomyideous galls affecting both sides of the leaf 

 of the common meadow sweet {Spiraa ultiiaria) are well 

 known as they appear on the upper surface, simply as a 

 somewhat spherical or globose enlargement of the leaf 

 tissues, corrugated by a minute network of veins, the colour 

 varying from white to deep pink, and the surface glabrous. 

 Beneath the leaf, however, their structure is very different, 

 being composed, when fully developed, of two filmy growths 

 of tissue, joined or closely applied by their edges, forming 

 together a kind of funnel-shaped or inversely pear-shaped 

 involucre to the true gall or larval chamber within, and the 

 gradual change of form in the progress of development 

 (which, as far as I am aware, has not yet been described) is 

 of some interest. 



