CATALOGUE OF BRITISH PLANT-GALLS 225 
Diptera On the stem. A gall composed of hypertrophied imbri¬ 
cated leaves, reddish below, glabrous and shining, with a 
central cavity containing a yellow larva. 
Cecidomyia sp. 676 
Trail, 1878, 1885. Houard, No. 4571. 
Vaccinium Myrtillus Linn. 101. Whortleberry. 
Fungi Red or purplish swollen spots on the leaves, which are 
variously deformed ; also elongated fusiform swellings on 
the stems. 
Exobasidium vaccinii Wor. 677 
Connold, Plant Galls, fig. 96. Massee, Brit. Fung. 6 77 a 
Flora, i., 108. 
OLEACEAE 
Fraxinus excelsior Linn. 109. Common Ash. 
Diptera Circular pustules, 6 to 8 mm. in diameter in the leaf 
parenchyma, not very pronounced ; tinted green or yellow¬ 
ish-green, with an irregularly rounded opening on the 
inferior surface. The gall falls away at maturity, leaving 
a hole with a brown border in the leaf. 
Dasyneura fraxinea Kieffer 678 
Trail, 1886, p. 108 ; 1888, p. 24. Houard, No. 4647. 
,, On a petiole, or more frequently on the midrib, of a 
leaflet. Elongated pouch-like galls, opening by a slit on the 
upper surface in September. Tinted with reddish-brown 
or purple. Larvae orange-coloured, gregarious. M. E. 679 
Perrisia fraxini Kieffer 680 
Connold, Veg. Galls, pi. 93 ; Plant Galls, fig. 33 ; as 
caused by Diplosis botularia Wtz., which is, however, only 
an inquiline. Houard, No. 4644. 
,, Leaflets thickened and hardened, their margins folded 
upwards until they form a pouch for the numerous white 
larvae. M. E. 
Perrisia acrophila Winn. 681 
Syn. Dasyneura acrophila Winn. 
Connold, Plant Galls, p. 244. Houard, No. 4643. 
Homop- Leaf thickened, loosely rolled inwards, greenish-yellow, 
tera tinted, and streaked with red and purple. Usually the 
blade on one side of the midrib only is affected; rarely 
both margins are rolled. (Plate XII. 1.) 
Psyllopsis fraxini Linn. 682 
Connold, Veg. Galls, pi. 74 ; Plant Galls, fig. 34, as 
caused by Phyllocoptes fraxini Nalepa. H ouard, N0. 4641. 
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