NATURAL HISTORY SOCIETY OF GLASGOW. 183 



Larva: length barely two lines, elongated, flattened, deeply 

 incised between segments, anal segment with six prominent 

 tubercular points or teeth, arranged in two groups of three each ; 

 central two-thirds of larva of uniform width, sharply tapering to 

 head ; posterior segments narrower and abruptly truncate ; colour 

 brilliant orange. 



Kaltenbach states in his " Pflanzen-Feinde " (p. 175), that the 

 yellow larvae are found in May, and that they leave the gall in 

 June to pupate in the earth. According to Dr Franz Loew 

 (Verb. d. k. k., zool.-bot. Gesellsch. in Wien, 1875, p. 30), each 

 gall is inhabited by from 2-10 orange-yellow larvae, 3-5 mm. long, 

 and that they go to the earth towards the end of June. Dr Loew 

 gives a good figure of the gall (1. c, Taf. ii., fig. 3), as found on 

 Prunus domestica, Lin. : it appears somewhat more elongate than 

 those I have seen here on P. communis, var. spinosa. Several of 

 the empty galls had a small round perforation in the side, the 

 work of an inquiline probably, as such galls I found to have traces 

 of frass inside. The rightful inmate would emerge by the slit on 

 the upper face of the gall. 



The perfect insect is, so far, unknown. 



Cecidomyia pustularis, Bremi^ 



Oak-leaves having one or more lobes of the margin folded to 

 underside, are very common in Mugdock Wood, occurring also 

 in Gadder Wilderness. Similar productions are described by 

 Bremi under the above name. I have never found larvae 

 inside, being probably too late in the year in my searches. 

 Kaltenbach (1. c, p. 676) and Miiller (E. M. M., vii., p. 88) 

 have done so, and the latter describes the adult larva as one line 

 long, and white, and that 2 or 3 larvae live in a fold. 



HORMOMYIA MILLEFOLII, LoeW. 



Last autumn I was fortunate enough to breed two specimens 

 of the male of this species, of which I made a careful description 

 at the time, supposing the male to be undescribed. Whilst 

 engaged, however, in the preparation of the present paper, I 



* During the progress of this paper through the press, Dr !F. Loew has 

 described the perfect insect in the Verh. d. k. k. zool.-bot. Gesell. of Vienna for 

 1877 (p. 14), under the name Diplosis dryobia, giving a figure of the leaf with 

 its folded lobes (1. c, Taf. i., fig. t>). 



