2 



M. MATSUMURA. 



Thorax is of the same color as the anterior wing, abdomen much 

 paler ; hind tibia large and compressed, with 4 spines. Wing expanse 25 

 mm., body length 12 mm. ; two broods in a year, first middle July, 

 second late September to early October. 



Eggs — These are placed just under a small twig where the rain 

 does not strike directly, protected safely by a white silken web. The 

 eggs under that cover are about 20 in number ; oblong in shape, both 

 ends being a little narrower ; very flat ; black in color ; 0,7 min. x0,4 

 mm. in size and hybernating through the winter in this state. 



Larva — The larvae hatch in early june, just at the time when the 

 pear attains the size of a cherry, at first spinning much silken thread on 

 the branches and then making their way to different fruits near by. To 

 the injured fruits are attached almost always silken threads just at the 

 place of branch, where a fruit stalk hung. At first whitish in color, 

 with black head and black first segment, the larvae gradually change in 

 color to grayish yellow ; and when fully mature, they take a pinkish 

 brown color, measuring about 20 mm. in length. They are 

 spindle shaped in general, consisting of 12 segments, of which the 

 6th., 7th., and 8th. are the largest ; head brownish black ; the 

 upper part of the second segment with 2 pitchy black horny spots ; 

 legs show nothing unusual. They injure only the core of pears and 

 as they leave always a large blackish opening at their entrance, it 

 is easy to detect their presence. The larval stage lasts 3 weeks or 

 more ; the insects I cultured have made cocoons on the 30lh. of 

 June. Food plant only pear. 



Pupa — It always changes to pupa within the core of the fruit 

 spinning very little silk ; it is deep red brown in color, head, thorax and 

 wing portion being much more so; it measures 13 mm. — -15 mm. 

 m length ; pupal stage lasts more than 2 weeks. 



Preventive method — The most effectual preventive method is to 

 take off the eggs during winter months, as they are easily recognizable 

 by their whitish web cover at the branches. For this purpose pruning 

 is indispensable, eggs being almost always on the top of the branches ; 



