CHROMOSOMES IN COREID HEMIPTERA. S/ 



ju-t a- in those of the inner groups. At the close of the second 

 division tin- chromosomes of the first polar body are finally 

 merged together in a deeply-staining mass. 



The -e. Miid division tollows closely upon the fir>t a- Mated 

 above. The chromosomes do not crowd together in the final 

 ana]iha-e < >\ the fir-t division as in the spermatocytes, but merely 

 rotate about lorty-five degrees and become disposed upon a new 

 -|>indle which lorins out of the enveloping cytoplasm. Fig. 2, a, 

 -ho\\- .1 metaph.e-e of the second division in slightly oblique 

 pol.ir \ iew. The -even large dyads and w-chromosome dyad are 

 -harpl\ < Mil-nit ted and ready for division. The first polar body 

 \\ith ii- eight d\ads taken from the same section is shown in 

 2,i'. Fij , shows another polar view of a second division 

 metaphase, and I ig. 2, d and c, are side views of the same, each 

 -houing eight chromosomes. All the dyads are more or less 

 dia\\n Mm iii preparation for division, and in anaphase, separate 

 into i UM -i MI 1 1 1- df monads. Fig. 2, /and , show outer and inner 

 group- re-pecti\ely taken from the same anaphase; each ha- 

 M iiion.id-. I ig. 2. h and i, show an oblique view of an ana- 

 phase in t\\o -ertions (the surface of the egg is indicated by a 

 doticd lineal iheriijn of each section). The outer group which 

 passes into tin- -e ond polar body is shown above, the seven 

 Luge monads in //, the w-chromosome monad in /. The inner 

 ip \\hii h remains in the egg, is shown below; six of the large 

 moii. id- and i he w-chromosome monad in /, the remaining large 

 monad in /: The -t ippled object in /; is part of one of the chromo- 

 -oine- in ;. Tim- the end result is, that the female pronucleu- 

 i- lormed I nun eight single elements or monads, comparable to 

 tho-e borne b\ ,i spermatozoon containing the idiochromosome 

 \ id. \\'il-on. 'i i- 



There are no peculiar or "lagging" chromosomes in either 

 di\ i-i< >n. Which . -t t he polar divisions is reducing, i. e., -eparates 

 \\hole chidmo-ome- which have paired in synapsis, could noi 

 be determiiu'd, -ince the first oocyte pro])hases were not ob- 

 tained. 



While it i- not possible to identify the idiochromosomes in the 

 i\\o di\i-ion- ju-t di-cribed, the w-chromosome appears as a 

 constant element dividing in both. In the >permator> les \\il- 



