ON THISTLES, ETC. 
247 
Diptera 
Homop- 
tera 
Diptera 
9 9 
99 
f 9 
Floral receptacle hypertrophied, gall hard, plurilocular. 
Urophora stylata Fabr. 849 
Houard, No. 5909. 
Leaves rolled, bent, or otherwise deformed, discoloured. 
Aphis reddish brown or golden-yellow, with a large spot 
on the dorsum, and black cornicles. 
Aphis cardui Linn. 850 
Buckton, ii., 92. 
Cnicus arvensis Hoffm. 112. Creeping Thistle. 
Rounded or fusiform swelling, usually near the top of 
the stem (sometimes the involucres are affected), hard, 
glossy, greenish or brownish, attaining the size of a wal¬ 
nut, or even, according to Houard, “la dimension du 
poing.” Larval cavities numerous, each with a single 
occupant. M. G. Imago, June, I. 
Urophora cardui Linn. 851 
Connold, Veg. Galls, pi. 33; Plant Galls, fig. 292. 852 
Houard, Nos. 5925, 5929. 
Cnicus heterophyllus Willa. 58. Melancholy Thistle. 
Floral receptacle hypertrophied, without induration, 
containing a plurilocular gall. 
Tephritis CONURA H. Low 853 
Houard, No. 5913. 
Centaurea nigra Linn. 112. Black Knapweed. 
Floral receptacle transformed into a hard, cylindrical 
or ovoid gall, usually containing three cells, each inhabited 
by a single larva. M. G. 
Urophora solstitialis Linn. 854 
Connold, Veg. Galls, pi. 125 ; Plant Galls, fig. 144. 
Houard, No. 5964. 
Fusiform swellings on the midrib, veins or petiole ; 
green, surrounded later by a violet or yellow border. 
Larva yellow. M. E. 855 
Loewiola centaureae F. Low 856 
Connold, Plant Galls, fig. 143 (without name). Swan- 
ton, Knowledge, June, 1910. 
Capitulum swollen, hardened, plurilocular. M. G. 
Imago, July, August, I. 
Tephritis eluta Meigen 857 
Houard, No. 5966. 
