PLATE 2 



EXPLANATION OF FIGURES 



23 Drosophila neglecta Stt. mss., diploid, metaphase, spermatogonium; 

 (small chromosomes not evident, unless represented by the small chromatic 

 body in upper part of figure.) 



24 Same, all chromosomes present; made from an aceto-carmine smear. 



25 and 26 Same, haploid, second spermatocytes; aceto-carmine. 



27 D. funebris Fabr., diploid, metaphase, ovarian cell. 



28 Same; aceto-carmine smear, slightly later stage showing division. 



29 Same diploid, metaphase, spermatogonium; note the separation of the 

 two large chromosomes. 



30 Same, diploid, ovarian cell, anaphase in side view; note separation of large 

 chromosomes. 



31 Same, with large chromosomes in their normal position. 



32 Same, early anaphase, side view, showing division of the chromosomes. 



33 Same, haploid, first spermatocyte anaphase in side view for comparison 

 with figure 31. 



34 D. procnemis Will., diploid, ovarian cell, prophase. 



35 and 36 Same, slightly later stages. 



37 D. tripunctata Loew, diploid, metaphase, ovarian cell. 



38 Same, diploid, ovarian cell, two poles of anaphase in polar view, displaced 

 for comparison of the two groups. 



39 D. repleta WolL, diploid, metaphase, ovarian cell; aceto-carmine smear. 



40 Same, late metaphase showing division of chromosoines, from section. 

 The two round bodies at left of figure are chromatic (?) inclusions, not chromo- 

 somes. 



41 Same, spermatogonium. 



42 D. affinis Stt. mss. diploid, metaphase, spermatogonium. 



43 Same, late prophase, ovarian cell. 



44 and 45 D. obscura Fall, diploid, metaphase, spermatogonia. 

 46 Same, ovarian cell, (small chromosomes not evident). 



266 



