No. 2.— CONTRIBUTIONS FROM THE ZOOLOGICAL LABORATORY 

 OF THE MUSEUM OF COMPARATIVE ZOOLOGY AT HARVARD 

 COLLEGE, UNDER THE DIRECTION OF E. L. MARK, No. 197. 



Spermatogenesis in Acrididae and Locustidae. 

 Bv Herbert Spencer Davis. 



TABLE OF CONTENTS. 



I, Introduction . . . . 

 II. Material and metliods 

 III. Observations . . . . 



1. Structure of the testis 



2. The spermatogonia . 



A. Dissosteira Carolina 



B. Arphia tenebrosa . 



C. Hippiscus tubercu- 

 latus 



D. Chortophaga viridi- 

 fasciata . . . . 



E. Melanoplus femora- 

 tus 



F. Stenobothrus curti- 

 pennis 



G. Steiroxys trilineata 



3. Growth period of pri- 

 mary spermatocytes . 



A. Dissosteira Carolina 



1. Autosomes 



2. Monosome 



B. Arphia tenebrosa 

 1. Monosome . . 



C. Hippiscus tubercu 

 latus .... 



1. Autosomes . • 



2. Monosome . . 



D. Chortophaga viridi 

 fasciata .... 



1. Autosomes . 



2. Monosome . . 



E. Melanoplus femora 

 tus 



1. Autosomes . 



2. Monosome . 



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PAGT3 



IV. 



59 



