193 



4. The Mouth Parts. (Vide p. 80). 



1 3 4 



Fig- 63. Lateral Hairs of Antennae 



i. M. rossi 2. N. stephensi 3. A. lindesayi 



4. M. nigerrimus 



5. The Clypeal Hairs. These are four or six 

 in number (Fig. 64). 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). 



The hairs exhibit great variation in different 

 species, but are quite constant in the one species.* 



* Ed. and Et. 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. 



