a 



ft 



ft 



** 

 I 



FIG. I. Metapodius terminalis.^ a, polar view, spermatogonial group, Type A ; 

 b, first maturation-division, Type A; c, female, Type A (probably a young follicle 

 cell) ; d, spermatogonial group, Type B ; e, first spermatocyte-division, Type B ; _/, 

 female group, Type B ; g, second division, Type A, showing .f-chromosome free (the 

 idiochromosomes do not appear in the plane of section) ; //, second division in side- 

 view, 5-chromosome coupled with small idiochromosome ; ?', second division, .y-chromo- 

 some coupled with the large idiochromosome. (Fig. a is from a specimen taken at 

 Madison, N. J. ; b, g, //, /, from one individual from Charleston, S. C. ; c, e, and f 

 from Raleigh, N. C. ; </, from Mansfield, Ohio. A second male of Type B was 

 taken at Raleigh, N, C., from the same catalpa tree with an individual of Type A.) 



1 The enlargement is 3700 diameters somewhat less than that of the figures in my 

 preceding papers. The figures are all from camera drawings and are not schematized, 

 except that in Fig. I, g, one pair of the chromosomes has been slightly displaced in 

 order to show the ///-chromosomes more clearly. No attempt is made to show details 

 of the achromatic spindles. In all the figures / denotes the large idiochromosome, 

 /, the small one, m the w-chromosome, and s the .y- chromosome. (The latter not to 

 be distinguished from the /- chromosomes in a and c . ) 



