_Chlænius æstivus_ (_Family Carabidæ_). 207. First spermatocyte, spireme stage, showing the unequal pair associated with a large plasmosome. 208. First spermatocyte, metaphase. 209-210. First spermatocyte, beginning of metakinesis. 211. First spermatocyte, equatorial plate, 17 chromosomes. 212. First spermatocyte, anaphase, showing elongated centrosome and diverging univalent chromosomes. _Chlænius pennsylvanicus._ 213. First spermatocyte, spireme stage. 214. First spermatocyte, equatorial plate, _x_ the unequal bivalent. 215. First spermatocyte, late prophase. _Galerita bicolor_ (_Family Carabidæ_). 216. Equatorial plate of spermatogonium, 30 chromosomes--29 large, 1 small. _Anomoglossus emarginatus_ (_Family Carabidæ_). 217. First spermatocyte, growth stage, _x_ the odd chromosome. 218. First spermatocyte, prophase. 219-220. First spermatocytes, metaphase, _x_ the odd chromosome. 221. First spermatocyte, equatorial plate. 222. First spermatocyte, daughter plates containing 18 and 19 chromosomes, respectively. 223. Second spermatocytes, equatorial plates. _Elater I_ (_Family Elateridæ, species not determined_). 224. Equatorial plate of spermatogonium, 19 chromosomes, _x_ the odd one. 225. First spermatocyte, spireme stage, _x_ the odd chromosome. 226. First spermatocyte, metaphase. 227. First spermatocyte, prophase. 228. First spermatocyte, equatorial plate. 229. Equatorial plate from egg follicle, 20 chromosomes, _x_{1}_ and _x_{2}_ the pair corresponding to _x_ in the spermatogonium. _Elater II_ (_Species not determined_). 230. Equatorial plate of spermatogonium, 19 chromosomes, _x_ the odd one. 231. First spermatocyte, spireme stage. 232. First spermatocyte, prophase. 233. First spermatocyte, beginning of metakinesis. 234. First spermatocyte, equatorial plate, _x_ the odd chromosome. 235. A pair of second spermatocytes in metaphase, two chromosomes connected, _x_ the odd chromosome. _Ellychnia corrusca_ (_Family Lampyridæ_). 236. Equatorial plate of spermatogonium, 19 chromosomes. [Illustration: STEVENS PLATE XIII. N. M. S. del. COLEOPTERA] PLATE XIV. _Aphrophora quadrangularis_ (_Hemiptera homoptera_). FIG. 237. Resting primary spermatogonium with lobed nucleus. 238. Resting secondary spermatogonium, with nucleus staining much more deeply. 239. Equatorial plate of secondary spermatogonium, 23 chromosomes. 240. First spermatocytes, very early growth stage, _x_ the odd chromosome. 241-243. First spermatocyte, later spireme stages, showing the odd chromosome (_x_) and a pair of _m_-chromosomes (_m_). 244. Similar stage from a safranin-gentian preparation. 245. First spermatocyte, split-spireme stage, _x_ the odd chromosome, _m_ the _m_-chromosome tetrad. 246. Similar stage from a safranin-gentian preparation. 247-248. First spermatocyte, condensation of chromatin granules to form tetrads in the linin spireme. 249. Later tetrad stage.