232 



(c) Below the feeding brushes, and not so 

 easily visible, are two stout bodies with comb- 

 like projections (mandibles). 



{d) In the middle inferior line lies a conical 

 toothed structure. The under lip of Meinert 

 (Fig. 23). 



(e) In the fully-grown larva a snout-like 

 process covered with short hairs projects forwards 

 in the middle line between the brushes. 



The front portion of the head projects between 

 the antennae as a semi-circular smooth area. In 

 front of this is a protrusion overhanging the base 

 of the brushes (the clypeus). 



5. The Clypeal Hairs. — These are four or six 

 in number. Two spring from the extreme front 

 of the clypeus near the middle line ; two from the 

 outer corner of the .clypeus immediately over 

 the feeding-brushes, and two usually very small 

 and not always present behind the origin of the 

 others. 



The clypeal hairs are best seen when the 

 feeding brushes are retracted. They must not be 

 confounded with certain other hairs on the larval 

 head. These are : — 



(i) Six large branched hairs arising from 

 the prominence lying between the bases of the 

 antennae. 



(ii) Four similar branched hairs, but smaller, 

 situated further back (Nuttall and Shipley). 



Note. — Ed. and Ex. Sergent describe variations in these 

 hairs in A. algeriensis. In eighteen out of forty-six examined 

 both were simple. In three out of forty-six both were slightly 

 branched. In twenty-five out of forty-six the central hair had 

 two or three small terminal branches. 



