ON THISTLES, ETC, 247 



Diptera Floral receptacle hypertrophied, gall hard, plurilocular. 



Urophora stylata Fabr. 849 

 Houard, No. 5909. 



Homop- Leaves rolled, bent, or otherwise deformed, discoloured, 



tera 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. 

 Diptera 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, L 



Urophora cardui Linn. 851 

 Connold, Veg. Galls, pi. 33 ; Plant Galls, fig. 292. 852 

 Houard, Nos. 5925, 5929. 



Cnicufi 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, 19 10. 



Capitulum swollen, hardened, plurilocular. M, G. 

 Imago; July, August, I- ^ ,. • o 



Tephritis eluta Meigen 857 



Houard, No. 5966. 



