CATALOGUE OF BRITISH PLANT-GALLS 189 



sometimes distorted in a similar manner. Numerous 

 larval burrows within. 



Ceuthorrhynchus pectoralis Schult 391 

 Connold, Plant Galls, fig. 66. Houard, No. 2668. 



Coleop- Slight swelling on the lower part of the stem. See 



tera No. 389. 



PSYLLIOIDES NAPI Koch 392 



Houard, No. 2669. 



Diptera Flowers remaining closed, forming a globular gall. See 

 No. 390. 



Perrisia cardAminis Winn. 393 

 Connold, Plant Galls, fig. 67. Houard, No. 2665. 



Fungi 



Coleop- 

 tera 



Floral leaves greatly hypertrophied. Stem and flowers 

 much distorted and swollen, affected parts snow-white, 

 appearing as if polished at the time when the conidia are 

 forming beneath the epidermis ; upon the rupture of the 

 latter the free conidia appear on the surface as a white 

 powder. The well-known '' white rust." 



Cystopus candidus L^v. 394 

 Syn. Albugo Candida Lev. 394<* 



Massee, Textbook PI. Diseases, pi 59. 394(5 



Caxdamine hirsuta Linn, i lo. Hairy Bitter Cress. 

 In egularly subglobose, unilocular, small, fleshy swellings 

 on the petioles of the radical leaves. 



Ceuthorrhynchus contractus Marsh 395 

 Houard, No. 2657. 



Erophila verna E. Meyer {—Draba verna L). 109. 

 Common Whitlow Grass. 



An ovoid swelling at the base of the stem^ containing a 

 single white larva. M. E. (Plate VL 4.) 



Ceuthorrhynchus hirtulus Germar 396 



Connold, Plant Galls, p. 246. Houard, No. 2688. 



Cochlearia armorica Linn. Horse Radish. 

 Rounded swelling on the upper part of the root. 



Ceuthorrhynchus pleurostigma Marsh 397 

 Houard, No. 2510. 



Hesperis matronalis Linn. Dame's Violet. 

 Seed-pod (siBqua) swollen. 



Ceuthorrhynchus inaffectatus Gyllh. 398 

 Houard, No. 2737. 



