The cliitinous plate from which it springs is prolonged into 

 a triangular process so that the meal will be worked along its 

 sloping sides. 



The most remarkable feature of the larva is the presence 

 of a curved H-shaped chitinous plate (Fig. 6) which is situat- 

 ed far forward dorsally on the first thoracic segment. The 



Via. 6. — ^Above, larva of Pachymerus chinensis, showing the chitinous process. 

 Below, the chitinous process as it stands on the prothorax. (Front view.) 



upper limbs of the H have seven teeth gradually diminishing 

 in size towards the outer extremity and bent on themselves 

 so that they are all blunt. At the place of the cross piece in 

 the H there are four teeth similarly curved and blunt. The 

 whole structure is curved backwards so as to follow tlie cur- 

 vature of the segment, but it can be erected at an angle to 

 the body which may be very obtuse. 



How THE Larva Bores. 



We are now in a position to follow the procedure of the 

 larva in effecting entry into the seed. The larva which is 

 on its back when hatched turns over so that the ventral 



