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. 
By HERBERT SPENCER Davis. 
TABLE OF CONTENTS. 
I. Introduction 
II. Material and fdbuhrien 
III. Observations 
1. Structure of the testis 
2. The spermatogonia 
A. Dissosteira carolina 
B. Arphia tenebrosa 
C. Hippiscus tubercu- 
latus 
D. Chortophaga eres 
fasciata ‘ 
E. Melanoplus femora- 
tus : 
F. See ails ied 
pennis fd tae 
G. Steiroxys onan 
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 iets 
fasciata . J 
1. Autosomes . 
2. Monosome . 
E. Melanoplus femora- 
0) ey CN he me 
1. Autosomes. 
2. Monosome . 
PAGE 
60 
63 
64 
64 
66 
66 
73 
73 
75 | 
75 
76 
(hs 
79 
79 
79 
84 
85 
85 
86 
86 
87 | 
87 
87 
88 
89 
89 
89 
59 
PAGE 
FE. Stenobothrus curti- 
pennisz=se as ons 89 
1. Autosomes. . . 89 
2.°. Monesome:..* <<: 2.0. 90 
G. Steiroxys trilineata 91 
f;Autosomes:.- .e) 2°OL 
2. Menosome:.3. °°.) °9Z 
4. Maturation period . 93 
A. Dissosteira carolina @ 93 
1. Autosomes . . 98 
2. Monosome 100 
B. Arphia tenebrosa . 102 
C. Hippiscus tubercu- 
latus 2 es 102 
D. Chortophaga witli 
fasciata Re hl sey AAR Nh 29 
i. Melanoplus femora- 
CUS) <Page ee, OS 
F. Stenobothrus curti- 
Penmis <2 Ase. 103. 
I. -Autosomes: * 7s... 105 
2. Monosome aa) > T0G. 
G. Steiroxys trilineata 108 
1, -Autosomes.. 2S “108. 
2. Monosome. . . 109 
5. The metamorphosis 
of the spermatids . . 110 
A. Dissosteira carolina 110 
Bi Steiroxys trilineata 113 
IV. Discussion. « . + ane 
1. The apical all 116 
2. The spermatogonial 
autosomes . 118 
3. Synapsis 122 
