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AccordiiiL;" to tlie length of the bnd)-, which uas measured with an ex- 

 actness of about I 10 mm, the individuals have been c^roupcd into 23 classes 

 which comprise all ihusc «hich stand between a L,'i\'en unit and the next one. 

 ^■\s the result of these nieasLU'cments tlie fullowinL; table was obtained (Table 

 !)■ 



Class, (mm) 24 

 I-'retjuenc)'. 2 



Class, (mm) 36 

 r'requenc}-. 62 ; 



From this table it is e\ident, in the first place, that the body size is 

 found in \ar\' tVom 24 nim tn 46 mm. Consequently the largest individuals 

 attain about twice the size <if the smallest ones; this fact in itself is already 

 strikinij. In the second place, the number of individuals is gradually in- 

 creased to the hei;4ht of the 30 mni class, which is represented by 8r mem- 

 bers, while the Nmallest i. e. the 24 mm class, contains only 2 intiividuals. 

 Then, the number is decreased by grades to 43 in the 34 mm class, losing 

 about 40 in passing through 3 classes. From the 35 mm class on, the num- 

 bers of the respecti\-e classes rapidly increase again and finally attain, in the 

 40mm class, the climax with 137 individuals. Then, the number falls again 

 by grades as tar as the 44 mm class with 62 indi\'iduals. In the next class, 



45 mm, the number drops \-ery suddenly and still more so in the class of 



46 mm, w hich consists of onl_\- 2 of the biggest forms. Taken as a whole, 

 the prevalent distriluitioii of variatcs of the 3J c/asus- is vict li'itJi tzoice, i. c. at 

 the j;o win class ami at the -/.o iiiin, the two being separated by a wide gap 

 near the 34 nim class. 



I ha\e endeavored to sho«' the results graphically in Fig. 2. The figures 

 on the ordinate show the number of indi\iduals, those on the abscissa giving- 

 the bod)' length in milimeters. 



A glance at the cur\e makes it evident that the present species may be 

 a.ssumed to be tiiniorphic. so far as the majority- of individuals is concerned. 



