THE PEAR-TREE LTD A. 481 



were developed, the last of which did not disappear 

 until October. Prof. Peck discovered a minute 

 ichneumon fly, which deposits an egg in that of the 

 saw-fly, and which, when hatched, feeds upon the 

 contents, becomes transformed, and flies away upon 

 its mission. This slug may be destroyed by dust- 

 ing slacked lime upon the foliage when the dew is 

 upon it. 



(4) The Pear-free Lycla — Lijda fosciata. During 

 the month of July the larva of this insect attacks the 

 foliage of the pear. It is of a pale yellow color, 

 with a black head, and is nearly one inch in length. 

 It spins its silken web round the young leaves, and 

 quickly consumes them. After its work is done, it 

 lodges in the earth, and comes forth the following 

 May as a moth. The male is black, with a yellow 

 front of the head and abdomen. It is about a half- 

 inch in length. The female is a little larger, but 

 of the same color, except it has the yellow only 

 between the atennae, at their base, on the mandibles, 

 the legs, and the latter half of the abdomen. The 

 larvae can be destroyed by dusting the foliage with 

 slacked lime [Westwood). 



(5) Large Pear-tree Astyages — Astyages Hemero- 

 hiella. " My attention was directed, at the end of 

 May, 1850, to the state of several pear trees trained 

 against a wall in the gardens of the Horticultural 

 Society at Chiswick. These were infected by myr- 

 iads of small caterpillars in a blackish, cylindrical, 



41 



