Al'HILOTHRIX MAKGJXALIS. 89 



much more spindle-shaped than the previous speci- 

 mens, and also distinctly ridged — a feature neither 

 mentioned by him in his description of the gall, 

 referred to by Cameron, nor found in my specimen. 



There may l)e, however, variations in mode of 

 growth such as would allow each of the aliove to be 

 representative. 



They are illustrated in Fig. 9 for comparison, and 

 to assist the collector to identifv anv he mav find. 



Aphilothrix marginalis, Scldechtendal. 



(Plate XXIV, div. A.) ' ■ 



Cyni^js niarglnaJis, Mayr, Schltcll. ; Andriciis margiiKills, Mayr, 

 Camei*(jn ; Aphiloihrix marginalis, Mayr, Lielit., Acller, Fitch, 

 Moslev. 



English name of gall. — " The Marginal Gall. ' 



Position of gall. — On margin of leaf; sometimes on mid-rib. 



Manner of growth. — Sessile, solitary, glabrous, glossy. 



Colours. — Green, striped with pink or red, yellowish, thrown. 



Average dimensions of a mature specimen. — Height, 

 4 mm. : breadth, 3 mm. ; girth, 9 mm. 



May be sought during the months of May and June. 



Growth is complete l>y the end of June. 



The typical condition of the gall is unilocular and imilarval. 



The larva pupates in the gall. The imago emei'ges during the 

 same or the following month. 



Parasite, No. 66. 



Cameron says : " Xeither as regards the gall, or 

 insect, is this to be known from A. 4-h'rteatns. I have 

 no doubt that it is only A. qiiaxlrilineatus, the galls of 

 which occur on the leaves" ('Brit. Phyto. Hymen.,' 

 vol. iv, p. 96). Mayr remarks that they so greatly 

 resemble each other as to be indistinguishable. 



In form this gall is irregular; it may be conical, 

 oval, or roundish, more or less deeply ribbed longi- 

 tudinally, and when on leaves larger than when on 

 catkins. 



The larval chamber is laree with thin walls. 



