PLATE 4 



EXPLANATION OF FIGUKES 



Lygaeus bicrucis (68-73, 83, 84), Largus cinctus (74-82), Anax Junius (85-87), 

 Achurum (88-92). Enlargement 2250, excepting the figures of Achurum, which 

 are enlarged 1500 diameters. 



68-70 Stage a. Earlier and later final spermatogonia! telophases, from the 

 same cyst. Lygaeus. 



71-72 Stage b. Lygaeus. 



73 a-73 b Stage d. Leptotene-nuclei. Lygaeus. 



74-75 Spermatogonia! telophases, from the same cyst. Largus. 



76-78 Stage c. Largus. 



79-80 Stage d. Leptotene-nuclei. Largus. 



81-82 Stage/. Diplotene-nuclei. Largus. 



83-84 The same. Lygaeus. 



85-87 Stages b-c. Anax. 



88-92 Stages b-c. Achurum. 



438 



