The spermatids show some interesting variations from the other species which have been examined. In figures 178 and 179 we have telophases of the second spermatocyte, showing centrosome and archoplasm (fig. 178) and certain masses of deeply staining material in the cytoplasm (fig. 179, _a_{1}_). Figures 180 and 181 are young spermatids showing the archoplasm from the second spindle (_a_{2}_) and a smaller, more deeply staining mass (_a_{1}_), derived from the irregular masses of the earlier stage (fig. 179, _a_{1}_). In figures 182 and 183, the axial fiber has appeared and the larger mass of archoplasm (_a_{2}_) is being transformed into a sheath. The other body remains unchanged. During the following stages this smaller archoplasmic body (_a_{1}_) lies in close contact with the axial fiber and sheath (_a_{2}_), and gradually decreases in size (figs. 184-186) until it disappears in a slightly later stage. The acrosome seems to develop directly out of the cytoplasm. The enigmatical body (_a_{1}_), which is probably archoplasm from the first maturation spindle, as it is not found in the cytoplasm of the first spermatocyte, may serve as nutriment for the developing axial fiber. The sperm head has a peculiar triangular form, staining more deeply on two sides. Miscellaneous Coleoptera. Considerable material from the spruce borers was collected at Harpswell, Maine, but the species were not identified. Although these insects were in the pupa stage, most of the testes were too old. There were no dividing spermatogonia and few spermatocyte mitoses. Most of the spermatocytes contained 10 chromosomes, one of which was plainly an unequal pair. In a few testes the number was 11, indicating that pupæ of two species had been collected. Figure 187 shows the metaphase of first spermatocyte mitosis with the unequal pair in metakinesis. Figures 188 and 189 are first spermatocyte equatorial plates of the two species, containing 10 and 11 chromosomes respectively. Figure 190 is a first spermatocyte spindle in anaphase, showing the unequal pair behind the other chromosomes. Figure 191 is an equatorial plate from a second spermatocyte, showing the small chromosome. In figure 192 are shown several of the bivalent chromosomes, including the unsymmetrical pair, from nuclear prophases of the first division, all from the same cyst. _Adalia bipunctata_ (family Coccinellidæ), the common lady beetle, has a very conspicuous pair of unequal heterochromosomes, as may be seen in figures 193-197 (plate XIII). This would seem to be a favorable form for determining the chromosome conditions in somatic cells, but no clear equatorial plates were found in either larvæ or pupæ.