26 DESCRIPTION OF PLATES. 



PLATE III. 

 Pale milk-weed aphid, 



FIGS. 58-59. First spermatocyte, metaphase. 

 60-61. First spermatocyte, anaphase. 



62. First spermatocyte, daughter plate. 

 63-64. First spermatocyte, prophase. showing paired chromosomes. 



65. Se"ccnd spermatocyte, metaphase. 



Nasturtium aphid. 



66. First spermatocyte, metaphase. 

 67-68. First spermatocyte, prophase. 



Oak aphids. 



69. No. I, first spermatocyte, metaphase. 



70. No. I, first spermatocyte, anaphase. 



71. No. I, second spermatocyte, metaphase. 



72. No. I, second spermatocyte, anaphase. 

 73-74. No. II, first spermatocyte, metaphase. 

 75-77. No. Ill, first spermatocyte, metaphase. 



78. No. Ill, first spermatocyte, anaphase. 



Beach goldenrod aphid. 



79 a and b. Parthenogenetic egg, polar body and prophase of first segmen- 

 tation mitosis. 

 80-8 1. First spermatocyte, metaphase. 



82. First spermatocyte, anaphase, 



83. Second spermatocyte, metaphase. 



84. Second spermatocyte, anaphase. 



Tall goldenrod aphid. 



85. First spermatocyte, before pairing of chromosomes. 



86. First spermatocyte, prophase, showing paired chromosomes. 



87. First spermatocyte, metaphase, Gilson. 



88. First spermatocyte, early anaphase, Gilson. 



89. First spermatocyte, metaphase, Flemming. 



90. First spermatocyte, early anaphase, Flemming. 

 91-92. Second spermatocyte, metaphase. 



