393 



I. Egg (18 chrom.) -|- Sperm. (18 chrom.) = female (36 chrom.). 



II. Egg (18 chrom.) + Sperm. (17 chrom.) = male (35 chrom.). 



I cannot at present reconcile the discrepancy that appears to 



exist between Aplopus and several phasmids (Leptinia and Menexenus) 



described by de Sinety ('03) where he reports a chromosome count 



of 36 in both male and female somatic cells. 



Figs. 36 and 37. Side views of chromosome groups of metaphase and early ana- 

 phase stages. 



Figs. 38 and 39. Spindle of second maturation mitosis with chromosomes at 

 anaphase. 



Figs. 40, 41 and 42. Telophase stages. 



Figs. 43 and 44. Young spermatids, both with an accessory chromosome. 



Fig. 45. Slightly older stage. 



Fig. 46. Pair of still older spermatids, one with the other lacking the accessorj^ 

 chromosome. 



Fig. 47. Giant spermatid with two accessory bodies, the result of an amitotic 

 nuclear division of a primary spermatogonia! progenitor. 



Fig. 48. Pair of spermatids in later stages of transformation into a spermatozoon. 



