^35 



small hairs which do not appear to vary and 

 which are not of sufficient importance to describe 

 here. None of the above structures appear tp 

 vary in different species. ! .1 " 



Skeleton I.arvae 



Examination of Palmate Hairs. — The most 

 important appendages of, the abdominal segments 

 are certain small fan or palm-leaf-shaped hairs 

 attached by a short stalk to the outer dorsal 

 portions of certain of the segments' (Fig. 57A).' 

 The number of segments bearing well-developed 

 palmate hairs varies in different species. 



Place the larva under a coverglass in a drop 

 of water or use a permanently mounted larva. 



3 4 



Fig. ^yA. Palmate Hairs of Larvae : 



I. M.vossii. 2. M. nigerrimus. 3. M. listoni 



4. JV. maculatus 



I. Determine the number of segments which 



carry distinct and large palmate hairs and those' 



carrying ill-developed ones. " ' , 



"2. Carefully cut out with a needle two or 



three central abdominal segments. Crush these. 



