248 
BRITISH GALLS 
Hymenop- 
tera 
» 
Acari 
Homop- 
tera 
Centaurea scabiosa Linn. 82. Great Knapweed. 
Large elongated swellings, or small rounded projections, 
on the stems, striated longitudinally. Colour normal, 
larval cells numerous. M. G. Imago, May, I. 
Aulax scabiosae Giraud 858 
Syn. Aulax centaureae Thoms. 
Connold, Plant Galls, fig. 86. Houard, No. 5988. 
Irregular oviform swelling, about the size of a pea, on 
the midrib at the extreme base of the leaf. Colour slightly 
paler than that of the non-affected part. 
Aulax Fitchi Kieffer 859 
Fitch, 1877, p. 124. Connold, Plant Galls, p. 93 (with¬ 
out name). Swanton, Knowledge, June, 1910. Houard, 
No. 5991. 
Well-defined rounded pustules, 2 to 4 mm. in diameter, 
on the radical leaves, projecting from both surfaces, chiefly 
on the inferior ; colour greenish, becoming dark violet or 
black at maturity. Opening situated in the centre of a 
depression on the upper surface. (Plate XXL 4.) 
Eriophyes centaureae Nalepa 860 
Houard, No. 5989. 
Lapsana communis Linn. 112. Nipplewort. 
Irregular bending and folding of the leaf. Aphis grass- 
green, slightly reddish on the head ; cornicles long, pale 
green. Aphides abundant in early June on the under sur¬ 
face of the leaves. 
Macrosiphum alliariae Koch 861 
Syn. Siphonofthora alliariae Koch. 
Buckton, i., 124. Houard, No. 6030. 
Hymenop- 
tera 
Crepis paludosa Moench. 
Stem swollen. 
62. Marsh Hawk’s-beard. 
Cynips sp. 862 
Fitch, 1879, P- 2 59 - Houard, No. 6125. 
Mouse-ear Hawk- 
Hieracium Pilosella Linn. no. 
weed. 
Diptera Gall ovoid, often 10 mm. in diameter, velvety, formed 
by the rolling of a deformed leaf round the atrophied 
shoot. Larvae gregarious, white, becoming red. M. G. 
Cocoon white. 
Macroi.abis pilosellae Binnie 863 
Syn. Cecidowyia pilosellae Binnie. 
Binnie, 1877, p. 179. Connold, Plant Galls, p. 245. 
Houard, No. 6199. 
