114 PROCEEDINGS OF THE 



district. Schiner (Fauna Austr. Dipt, ii., 396) suggests the 

 probability of it being only a variety of A. sarothamni. 



In these notes I have altogether disregarded five species given 

 by Walker as British. 



II. — Notes on Cecidomyia irifolii, Fr. Lw., and its Gcdl. 

 By Mr Francis G. Binnie. 



The species was only described in 1874, by Dr Franz Loew 

 (Verb, der K.K. Zool-bot Gesell. xxiv.), but the gall had previously 

 been recorded for Britain by Mr J. W. H. Traill, M.A., F.L.S. 

 (Scot. Nat. L, 195). 



This species belongs to the genus Cecidomyia, as restricted by 

 Loew; and the character of the antennae, stalked in the male and 

 sessile in the female, places it in a sub-division of the genus whose 

 members are extremely difficult to distinguish from one another. 

 The habit of the larva, however, offers a ready means of distinction 

 when correlated with other differences; and usually a good 

 specific character is to be found in the number of the antennal 

 joints. In the present species these are 14-15 in both sexes. 



The gall is found on Trifolium repens, L., during the summer. 

 It consists of a folded leaflet, a pseudo-cell being formed in the 

 vicinity of the mid-rib, the walls of which become inflated and 

 more or less fleshy, often tinged with red externally, and one, 

 two, or all the leaflets of the triplet may be affected. Each 

 leaflet is inhabited by 1-2 larvae; on one occasion 4 were found. 

 They are white when young, and gradually change to orange at 

 maturity, when they attain a length of three-fourths of a line. 

 The insect generally goes through its changes within the gall, the 

 larva spinning a white cocoon. About this time, however, 

 numbers of the cells are to be found empty, from which, in the 

 absence of any indications of the ravages of an enemy, it may be 

 inferred that a certain number of the larvae descend to the earth 

 to pupate. 



The perfect insect begins to emerge towards the end of August, 

 and at intervals for some time afterwards, and larvae, pupae, and 

 imagos may all be found during that period. Tlie galls occur 

 commonly in the Possil district and near New Kilpatrick, and are 

 probably generally distributed. I have never found this species 

 affecting Trifolium pratense, for which Dr Loew records it. My 

 observations on the economy of the species differ in some minor 



