Ecological and Experimental Study of Sarcophagidce 73 



TABLE VIII 



Constants based on Tables V , VI, VII , and derived by the usual formula:: 



\j=-iKi} ,E^^± 0.6745 ' ; o = J^i^,E^=± 0.6745 



L n in \ n 



-L^ ; C = ^- X 100%, Ec = ± 0.6745 ^^ f I + 2 ( Vl^ 



F 2n A I 2n L V 100/ J J 



Larva Pupa Imagines 



n (Variates) 256 289 208 



/I (Average) 38. 183^.180 30. 283^.197 22. 283^1.176 



A/(Mode) 37. 28. 2i.or22.(?)* 



a(Indeiof Variab.) 4.293^.127 4.974^.139 3.769^.124 



C (Coeff. of Variab.) 11.24 i-33 16.42 ±.47 16.91 ±.56 



*See Table VH. 



2'5 29 33 37 41 45 49 17 21 25 29 33 37 41 45 13 17 21 25 29 33 



Fig. 7 Normal Frequency curves of Lucilia caesar Linne, based on Tables V, VI and VII, respec- 

 tively. The classes based on weight in milligrams are shown along the abscissa and the number of 

 variates along the ordinate. The first curve, based on 256 individuals, is of larvae at migration; the 

 second curve, based on 289 individuals, is of pupae at about mid-pupal period; the third curve, based 

 on 208 individuals, is of imagines shortly after emergence. 



Note — It is practically impossible to weigh all pupae at the same stage, which accounts for the irregu- 

 larity of the derived curve. The weight of the imagines was taken several hours (2 to 3) after 

 emerging from the pupa cases. It should be borne in mind that these imagines had not taken food 

 before weighing. This seems to be the best plan for the derivation of a curve with a reasonably 

 uniform basis. 



