The Scottish Naturalist. 377 



very commonly bears galls of Hormomyiajuniperina L., 

 in the form of terminal ovate triangular cones on the 

 slender twigs, each composed of three flattened leaves, 

 which meet along their edges, and enclose three smaller 

 leaves, between which is a cavity occupied by the larva. 

 The galls look much like young fruit externally. They 

 are at first green, but become brown as they dry. I 

 have found them in Aberdeenshire, and Mr. Binnie has 

 reported them to me from near Glasgow. (T.S.N., L, 

 194; T.A., I., 77.) 



J. nana. (Dwarf Juniper). Galls of H. juniperma, entirely like 

 those on J. communis, are recorded by Mr. P. Cameron, 

 from Scuir of Eigg. (Trans. N. E., Glasgow ; N.S., I., 

 pt. 3, pp. 295-97). 



Pteris aqililina (Bracken Fern). The pinnules have the 

 margins revolute, fleshy, at first yellowish-red, later deep 

 black. Each is tenanted by one orange larva of Ceci- 

 domyia Pteridls Mueller. The galls are very plentiful 

 wherever I have looked for them, and Mr. Binnie re- 

 ports them from Glasgow. (T.S.N., II., 304; T.A., I.. 

 77-78, B.I., 163;. 



Nephrodium dilatatum and N. Filixmas frequently 



bear pseudo-galls, which consist of unexpanded fronds, 

 the pinnae of which remained rolled up into a ball, from 

 10 to 50 mm. in diameter. The outer pinnae are green, 

 but those in the centre are black and decayed ; and 

 amongst them live one or more larvae, which, from their 

 structure, must belong to a species of Anthomyia. I 

 have not succeeded in rearing the flies. I have found 

 these structures near Aberdeen, from June to October, 

 also in Kincardine, and in Forfar and Perthshire, and 

 near Glasgow. (T.S.N., IT., 305 ; T.A., I., 78.) 



In conclusion, I subjoin a list of the gall-making Diptera of 

 Scotland, so far as they have yet been identified. 

 Several have been named from the galls alone, from 

 which the insects never have been reared or obtained. 

 Such names are placed between brackets. Some, the 

 identifications of which are doubtful, are marked with ? 



