112 PROCEEDINGS OF THE 



In the Glasgow district I have observed the following species : — 

 A, sarothamni, Lw. — This species is characterised by its size, 



and by having 15-jointed antennae in the male, 14-jointed in the 



female, with the terminal joint markedly shorter than the 



preceding one. 



This species forms galls on the common broom {Cytisus scoparius, 



Link) of three well-defined kinds. 



1. Axillary, and having the appearance of a large swollen bud. 

 The gall is smooth, with indications of ribs, pointed at the apex, 

 one-celled and thin-walled, length, 3-3J lines. It makes its ap- 

 pearance in early spring, each gall containing a single larva, which 

 goes through its transformations within the gall, emerging by a 

 somewhat ragged hole near the apex. The perfect insect begins 

 to appear towards the end of May. This seems to be the form of 

 gall described by Winnertz (Linnaea Entom., viii., 283), and 

 Kaltenbach (Die Pflanzenfeinde, p. 107). 



2. Also axillary, but usually crowded together in some 

 numbers on the apical portions of the twigs. It is elongate and 

 cylindric, length, 3-G lines ; open at the apex, which is usually 

 two-lipped, from which a passage, filled with dense interlocking 

 white hairs, leads into the thin-walled cell at the base, containing 

 a single larva, one line and a qucirter long, bright orange or 

 reddish orange, and minutely tubercled. The gall makes its 

 appearance at the end of summer, and continues through the 

 autumn. The larva leaves the gall to pupate in the earth, the 

 perfect insect emerging probably the following spring. I have 

 never bred the imago from this gall, and feel somewhat doubtful 

 whether it may be referred to A. sarothamni. 



3. A galled pod. The part affected becomes inflated, is oval or 

 round in shape, circular in transverse section, and projecting 

 equally on both sides of pod. It is thin-walled, forming an 

 internal cavity which contains a single larva, and the galled 

 portion retains its green colour after the rest of the pod has 

 become black. The perfect insect emerges by a hole in the side. 

 The gall is found during the summer, and the present species has 

 been bred from it by Mr Traill. 



Gall No. 1 is pretty common, No. 2 is abundant, and both are 

 generally distributed in the district. No. 3 I have seen only in 

 one locality, near Milngavie, and have failed to find it elsewhere 

 where No. 2 is abundant. 



