CATALOGUE OF BRITISH PLANT-GALLS 149 
Diptera 
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11 
11 
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Acari 
Leaf margin rolled inwards near the petiole. Rare on 
this species of Willow. See No. 93. 
Perrisia marginemtorquens Winn. 135 
MacDougall, Journ. Bd. Agric., Oct., 1905. Connold, 
Plant Galls, fig. 350. Houard, No. 807. 
Ovoid or spherical swelling, 1 to 5 mm. in diameter, on 
both surfaces of the leaf, yellowish-green or pale yellow, 
often tinted with violet or reddish-purple above. Gre¬ 
garious or coalescent. Opening inferior, rounded, larval 
cavity containing a single larva, white at first, then orange, 
red at maturity. M. E. 
Oligotrophus capreae Winn. 136 
Syn. Hormomyia capreae Wtz. 
Connold, Veg. Galls, pi. 95; Plant Galls, fig. 272. 
Houard, No. 812. 
Terminal leaves shortened, forming a rosette. See 
No. 101. 
Rhabdophaga rosaria H. Low 137 
MacDougall, Journ. Bd. Agric., Oct., 1905. Houard, 
No. 784. 
Fusiform swellings on one-year twigs. See No. 95. 
Rhabdophaga salicis Sch. 138 
MacDougall, Journ. Bd. Agric., Oct., 1905. Connold, 
Veg. Galls, Pis. 26, 27; Plant Galls, fig. 269. Houard, 
No. 800. 
Stem more or less swollen. See No. 94 and Plate IX. 10. 
Rhabdophaga saliciperda Dufour 139 
MacDougall, Gall-Gnats on Osiers and Willows, Journ. 
Bd. Agric., Oct., 1905. Houard, No. 798. The galls de¬ 
picted on Plates XXVI. and XXVII. of Connold’s “Vege¬ 
table Galls,” and on Fig. 269 of “ Plant Galls,” are caused 
by the presence of Rhabdophaga salicis Sch., not R. salici¬ 
perda, as therein stated. 
Pedunculated yellowish or reddish pubescent pustule 
on the upper surface of the leaf. The interior may be 
either subdivided by projections or quite smooth. Aperture 
inferior, surrounded by hairs. Gregarious or coalescent. 
Eriophyes tetanothrix Nalepa 140 
Connold, Veg. Galls, pi. 66 ; Plant Galls, fig. 271. 
Smooth pustular growth on the leaf, showing equally 
on both surfaces, yellow or red. Interior smooth, or 
subdivided by excrescences from its walls. Gregarious 
or coalescent. 
Eriophyes salicis Nalepa 141 
Houard, p. 146. There is some doubt concerning the 
species of Eriophyes responsible for this gall and the 
preceding one. 
