CHROMOSOME GROUP IN BRACHYSTOLA MAGNA. 



2 9 



FIG. 5a. 



FIG. 5b. 



FlG. 5&. Three largest spiremes and accessory chromosome from a primary sper- 

 matocyte in early prophase. (Smear-preparation.) 



FIG. 5b. Eight remaining chromosomes and accessory from same cell as Fig. $a. 



FIG. 7. 



k 



k 



a 



e 



FlG. 6. Partly condensed spiremes in middle prophase of primary spermatocyte. 

 All the chromosomes, including the accessory (x), show indications of a longitudinal 

 split. 



FIG. 7. Slightly more advanced chromosome group than that of Fig. 6. Letters 

 a, b, c, d, e,f, g, //, i t j and k designate the different chromosomes in order of size 

 from largest to smallest ; x designates the accessory. 



