. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 36. 38 FIG. 35. Anopheles First spermatocyte growth stage. X = the hetero- chromosome. FIG. 36. First spermatocyte prophase. FIGS. 37 and 38. Chromosomes of the first spermatocyte metaphase. Mag. 2,000 in all figures. the larval stage. The net was used in the pond many times during March, April and May, but no mosquito larvae or pupae secured except on the two dates given above. Fig. 35 shows the heterochromosome in the nucleus of a growth stage, Fig. 36 a prophase of the first maturation mitosis, and Figs. 37 and 38 th
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 36. 38 FIG. 35. Anopheles First spermatocyte growth stage. X = the hetero- chromosome. FIG. 36. First spermatocyte prophase. FIGS. 37 and 38. Chromosomes of the first spermatocyte metaphase. Mag. 2,000 in all figures. the larval stage. The net was used in the pond many times during March, April and May, but no mosquito larvae or pupae secured except on the two dates given above. Fig. 35 shows the heterochromosome in the nucleus of a growth stage, Fig. 36 a prophase of the first maturation mitosis, and Figs. 37 and 38 the six chromosomes from two first spermatocyte spindles. The largest pair is slightly unequal but not composite as in Anopheles punctipennis. DISCUSSION. As we have already seen, the various species of Culicidae, thus far studied, present peculiarities not hitherto encountered in the study of heterochromosomes in the various groups of insects. In Anisoloba maritima (Randolph, '08) and several species of Lepidoptera (Stevens, '06; Dederer, '07; Cook, '10) there is an equal pair of heterochromosomes distinguishable as such by their condensed condition in the growth stages of the first spermatocytes. In Drosophila ampelophila the unequal pair of heterochromosomes of the maturation mitoses is not condensed. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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