EXPLANATION OF PLATES 



All the figures, with the exception of the first three, were made with a Zeiss 

 2-mm. apochromat. objective and Zeiss compensating ocular no. 12. In order 

 to get as high a magnification as possible, drawings were made at table level, giving 

 an enlargement of about 1850 diameters. 



ABBREVIATIONS 



a, acrosome 

 a/, axial filament 

 c, centrosome 

 i, idiochromosomes 

 m, mitochondria 

 mj), middle-piece 

 n, nebenkern 

 0, ovipositor 



p, penis 



pi, plasmosome 



ps, planosome 



s, spindle remains 



sv, seminal vesicle 



t, tubules 



vd, vas deferens 



X, middle-piece anlage 



411 



