'01. Notes on the accessory chromosome. Anat. Anz., vol. 20, nos. 8 and 9. '02. The accessory chromosome--sex-determinant? Biol. Bull., vol. 3, nos. 1 and 2. '02_a_. The spermatocyte divisions of the Locustidæ. Kans. Univ. Quart., vol. 1, no. 8. '05. The chromosome complex of orthopteran spermatocytes. Biol. Bull., vol. 9, no. 5. MONTGOMERY, THOS. H., JR. '01. A study of the chromosomes of the germ-cells of Metazoa. Trans. Amer. Phil. Soc., vol. 20. '03. The heterotypic maturation mitosis in Amphibia and its general significance. Biol. Bull., vol. 4, no. 5. '01_a_. Further studies on the chromosomes of the Hemiptera heteroptera. Proc. Acad. Nat. Sci. Phila., 1901. '04. Some observations and considerations upon the maturation phenomena of the germ-cells. Biol. Bull., vol. 6, no. 3. '05. The spermatogenesis of _Syrbula_ and _Lycosæ_ and general considerations upon chromosome reduction and heterochromosomes. Proc. Acad. Nat. Sci. Phila., 1905. MORGAN, T. H. '06. The male and female eggs of Phylloxerans of the Hickories. Biol. Bull., vol. 10, no. 5. NOWLIN, W. N. '06. A study of the spermatogenesis of _Coptocycla aurichalcea_ and _Coptocycla guttata_. Journ. of Exp. Zoöl., vol. 3, no. 3. PAULMIER, F. C. '99. The spermatogenesis of _Anasa tristis_. Journ. of Morph., vol. 15. DE SINÉTY. '01. Recherches sur la biologie et l'anatomie des phasms. La Cellule, vol. 19. STEVENS, N. M. '05. A study of the germ cells of _Aphis rosæ_ and _Aphis oenotheræ_. Journ. of Exp. Zoöl., vol. 2, no. 3. '05_a_. Studies in spermatogenesis, with especial reference to the "accessory chromosome." Carnegie Inst. of Wash., pub. no. 36. '06. Studies on the germ cell of Aphids. Ibid., pub. no. 51. SUTTON, W. S. '02. On the morphology of the chromosome group in _Brachystola magna_. Biol. Bull., vol. 4, no. 1. '03. The chromosomes in heredity. Biol. Bull., vol. 4, no. 5. WILSON, E. B. '05. Studies on chromosomes. I. The behavior of the idiochromosomes in Hemiptera. Journ. Exp. Zoöl., vol. 2, no. 3. '05_a_. The chromosomes in relation to the determination of sex in insects. Science, vol. 22, no. 564. '05_b_. Studies on chromosomes. II. The paired microchromosomes, idiochromosomes, and heterotropic chromosomes in Hemiptera. Journ. Exp. Zoöl., vol. 2, no. 4. '06. Studies on chromosomes. III. The sexual differences of the chromosome-groups in Hemiptera, with some considerations of the determination and inheritance of sex. Ibid., vol. 3, no. 1. DESCRIPTION OF PLATES [The figures were all drawn with Zeiss oil-immersion 2 mm., oc. 12, and have been reduced one-third, giving a magnification of 1,000 diameters.] PLATE VIII. _Trirhabda virgata_ (_Family Chrysomelidæ_).