PLATE 5 
EXPLANATION OF FIGURES 
Microphotographs made at a magnification of 1500 diameters. No reduction. 
36 Amphitene nuclei. Note the thick pachytene thread at one pole and the 
fine leptotene filaments at the opposite pole. Synapsis occurs at this stage. 
37 and 38 Amphitene nuclei from first-year larvae. No effort has been made 
to show the cytoplasm. 
39 Pachytene nuclei. Synapsis complete. The threads appear single. 
40 Transition stage from pachytene to diplotene nuclei. The thick pachy- 
tene threads of figure 39 are in figure 40 splittion into two thin threads. 
41 Diplotene stages showing the disjunction of the leptotene threads paired 
in figure 39. Note at X the split in the thick thread. This is the primary longi- 
tudinal split. 
42 Diplotene stage showing splitting of the thick pachytene threads. 
43 and 44 Diplotene stages showing the figure-8 configuration of the splitting 
threads. 
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