_Odontota dorsalis._ FIGS. 69-70. First spermatocyte, metaphase. 71. First spermatocyte, equatorial plate. 72. First spermatocyte, metaphase, showing metakinesis of the heterochromosomes. 73-74. First spermatocyte, anaphase. 75-76. Second spermatocyte, equatorial plates. 77. Second spermatocyte, showing metakinesis of the small chromosome (_s_). 78. Second spermatocyte, prophase, showing chromosomes longitudinally split. 79-80. Young spermatids, _n_ the chromatin nucleolus. 81-87. A series of stages in the development of the sperm head, showing the various phases in the history of the chromatin nucleolus (_n_). 88. Cross-sections of nearly mature sperm heads. 89-90. Equatorial plates of spermatogonia of abnormal individual, 15 large chromosomes, 2 small ones. 91. First spermatocyte from same testis, spireme stage, showing 2 small chromosomes associated with 1 large one and a plasmosome. 92. First spermatocyte from the same testis, metaphase showing a similar heterochromosome group. 93. Second spermatocyte from same testis, equatorial plate, showing 2 small chromosomes. _Epilachna borealis_ (_Family Coccinellidæ_). 94. Equatorial plate of spermatogonium, 17 large chromosomes and 1 small one. 95. First spermatocyte, spireme stage, showing the unequal pair. 96-97. First spermatocyte, late prophases. 98. First spermatocyte, metaphase, showing chromosomes of different forms. 99-100. First spermatocyte, equatorial plate. 101. Unequal heterochromosome pair from a metaphase. 102. First spermatocyte, anaphase; ordinary chromosomes stippled to show more clearly the metakinesis of the unequal pair. 103. Second spermatocyte, equatorial plates. 104. Second spermatocyte, prophase. 105-106. Abnormal giant spermatids, probably in process of degeneration. _Euphoria inda_ (_Family Scarabæidæ_). 107. Equatorial plate of spermatogonium, 20 chromosomes. The 2 smallest are the unequal pair of heterochromosomes (_l_ and _s_). 108. Resting spermatogonium, showing plasmosome (_p_). 109. First spermatocyte, spireme stage. [Illustration: STEVENS PLATE X. N. M. S. del. COLEOPTERA] PLATE XI. _Euphoria inda._ FIGS. 110-111. First spermatocyte, prophases. 112-113. First spermatocyte, late prophase. 114-116. First spermatocyte, metaphase. 117. First spermatocyte, equatorial plate, _x_ the unequal pair. 118-120. First spermatocyte, anaphase. 121. First spermatocyte, daughter plates. 122. Second spermatocyte, prophase. 123. Second spermatocyte, equatorial plates. 124-125. Second spermatocyte, daughter plates of the two classes. 126-127. Second spermatocyte, anaphase. 128-130. Spermatids, _n_ the chromatin nucleolus. _Blepharida rhois_ (_Family Chrysomelidæ_). 131-132. First spermatocyte, spireme stages, showing the heterochromosome group. 133-135. First spermatocyte, beginning of metakinesis. 136. First spermatocyte, equatorial plate, _x_ the unequal pair.