PLATE 7 



EXPLANATION OF FIGURES 



119 Chaetopsis fulvifrous, haploid, metaphase,, first spermatocyte. 



120 Camptoneura picta, diploid, metaphase, spermatogonium. 



121 Same, haploid, metaphase, first spermatocyte. 



122 Physegenua vittata, diploid, metaphase, spermatogonium. 



123 Eristalis bastardi, diploid, early prophase, spermatogonium; nucleus not 

 entire. 



124 Volucella obesa, diploid, metaphase, spermatogonium, one chromosome 

 missing. 



125 Same, entire. 



126 Same, haploid, first spermatocyte; small bivalent is XY pair. 



127 and 128 Mesogramma marginata, diploid, metaphase, spermatogonia. 

 129 and 130 Anthrax lateralis, diploid, late prophase, spermatogonia; small 



pair not evident. 



131 Same, earlier prophase, nucleus entire. 



132 and 133 Same, metaphase. 



134 to 137 A. sinuosa, diploid, metaphases, spermatogonia. 



138 Same, haploid, first spermatocyte. 



139 Same, haploid, second spermatocyte, Y-containing group. 



140 Same, X-containing group. 



141 Spogostylum simson, diploid, metaphase, ovarian follicle cell. 



142 Same, early prophase. 



143 Asilus sericeus, diploid, metaphase, spermatogonium. 



144 and 145 Same, slightly later metaphases. 



146 and 147 Asilus lecythus, diploid, metaphases, spermatogonia. 



276 



