us aestivus_ (_Family Carabidae_).

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.

_Chlaenius pennsylvanicus._

213. First spermatocyte, spireme stage.

214. First spermatocyte, equatorial plate, _x_ the unequal bivalent.

215. First spermatocyte, late prophase.

_Galerita bicolor_ (_Family Carabidae_).

216. Equatorial plate of spermatogonium, 30 chromosomes--29 large, 1
small.

_Anomoglossus emarginatus_ (_Family Carabidae_).

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 Elateridae, 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 Lampyridae_).

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 chromosome