APRIL. 59 



the larva of the pretty Plutella porrectella occurs ; 

 the larva of this species forms a beautiful open net- 

 work cocoon on the underside of the leaves of the 

 plant on which it fed, in which it changes to the pupae 

 state ; it also occurs in gardens feeding on the common 

 " rocket." 



In the shoots of the "stone-crop" (Sedum acre), 

 " growing on a barn at Bexley," the larva of Gly- 

 phipteryx equitella occurs ; while in the shoots of the 

 birch, and also under the bark, the larvae of Argy- 

 resthia Goedartella and A. Brockeella will be found. 



If we look attentively at the leaves of the " ribwort 

 plantain" (Plantago lanceolata), we shall see on the 

 front of many of them a dark brown line running up 

 the centre; this is the mine of the young larvae of 

 Gracilaria tringipennella ; when nearly full fed the 

 leaf is considerably hollowed out in the mined abode, 

 which becomes broader, but the back of the leaf never 

 becomes discoloured ; the pupa is enclosed in a white 

 cocoon within the mine. 



On the Hypericum perforatum Messrs. Gracilaria 

 auroguttella & Co. still submit their genuine "cigars" 

 to the collector's notice, who will do well to lay in a 

 stock, as the establishment " positively closes this 

 month." While mining the leaves of the thorny rest- 

 harrow (Ononis spinoxa), and the dyer's greenweed 

 (Genista tinctoria) the larvae of Gracilaria Ononidis 

 may be found. 



If, in places having a south or south-western aspect, 

 we examine the young leaves of the " black knapweed' r 

 (Centaurea nigra), we shall observe that many of 

 them, some actually laying flat upon the ground, are 



