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'01. Notes on the accessory chromosome. Anat. Anz., vol. 20, nos. 8 and 9.
'02. The accessory chromosome--s.e.x-determinant? Biol. Bull., vol. 3, nos. 1 and 2.
'02_a_. The spermatocyte divisions of the Locustidae. Kans.
Univ. Quart., vol. 1, no. 8.
'05. The chromosome complex of orthopteran spermatocytes.
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MONTGOMERY, THOS. H., JR.
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'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 _Lycosae_ 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. Zool., vol. 3, no. 3.
PAULMIER, F. C.
'99. The spermatogenesis of _Anasa tristis_. Journ. of Morph., vol. 15.
DE SINeTY.
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'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.
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5.
WILSON, E. B.
'05. Studies on chromosomes. I. The behavior of the idiochromosomes in Hemiptera. Journ. Exp. Zool., vol. 2, no.
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'05_a_. The chromosomes in relation to the determination of s.e.x in insects. Science, vol. 22, no. 564.
'05_b_. Studies on chromosomes. II. The paired microchromosomes, idiochromosomes, and heterotropic chromosomes in Hemiptera. Journ. Exp. Zool., vol. 2, no. 4.
'06. Studies on chromosomes. III. The s.e.xual differences of the chromosome-groups in Hemiptera, with some considerations of the determination and inheritance of s.e.x. 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 Chrysomelidae_).
FIG. 1. Equatorial plate from somatic tissues of a male pupa, 27 large chromosomes, 1 small one.
2. Equatorial plate from an egg follicle, 28 large chromosomes.
3. Equatorial plate of spermatogonium, 27 large chromosomes, 1 small one.
4. First spermatocyte, synizesis stage.
5. First spermatocyte, early spireme stage, showing unequal pair of chromosomes.
6-7. First spermatocyte, later growth stages.
