' IIROMOSOMES IX COREID HEMIPTEKA. 85 



of the largest are probably the idiochromosomes, though they do 

 not differ sufficiently from the others, in size or shape, to admit 

 of exact identification. 



The anapha-e of the first mitosis was the earliest oocyte stage 

 obtained ;md was found in eggs just after laying. Fig. I, e 

 i from t\\o -ection>i, shows a polar view of this stage in which 

 ei-ht chromo-onir- can be accurately counted in both outer and 

 inner group-. Tin-re are seven large dyads and one very small 

 OIK- in c.ith. corresponding in relative size to the fourteen large 

 ami tuo -m. ill chromosomes of the oogonia. Fig. i, / and , 

 -ho\\ .1 -idi \ it-\\ of a late anaphase from two sections. The inner 

 - 1, >up c oi n,i in- right dyads; one of them has divided prematnn 1\ , 

 i IK- t\\o part- appearing in neighboring sections. The chromo- 

 somes in i IK- outer group are too crowded to be counted. PI. I., 

 </, -ho\\- aiioilit-r anaphase in which the inner group is complete 

 in one ->' lion and contains eight dyads. Fig. I, /; and /, -ln>\v 

 i IK inin-r giMup- of two more anaphases, polar view. The chn>- 

 mo-omr- in both are all dyads, eight in each, the component 

 parts "I \\lii< li -how all degrees of separation. This premainre 

 di\i-ioii oi i In dyads is very common in the final anapha-i-- of 

 tin In -t c]i\i~i<>n and might lead to mistakes in counting it it 

 were noi that one finds all stages of division up to the complete 

 -eparation -houn in Fig. I, /and g. Menking found this condi- 

 tion in tin ' . j of Pyrrhocoris ('92, PI. III.) and it has also been 

 l"iiinl in the lust spermatocytes of Aphrophora an homopteran 

 (Stevens, 'o6ft and A mix a dragon-fly (Lefevre and McGill. '08). 

 It i- probable that even in cases of extreme separation, the halves 

 oi tin <l\ad- remained connected by fine strands of chromatin or 

 linin \\hieh beeoine invisible after long extraction of the stain. 

 The -ei oml di\i-ion is thus foreshadowed, in the anaphase of the 

 first, and e\en before as will be shown in Anasa. Since there is 

 no pei i. id beiueen the first and second divisions when the chromo- 

 some- lo-<- their in<li\idual contour, in tact no telophase in the 

 >ti it t sense, the d\ ad- pass practicalh" unchanged into the second 

 maturation -pindle. 



The ehromo-omes which enter the first polar body retain their 



contour and grouping for some time, forming a flat plate when 



n in Mirfatv view. Fig. i, j, shows such a plate with seven 



