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EDMUND B. WILSON 



X 



k 



Fig. 9 Comparison of the m-chromosomes in Hemiptera. (In each horizon- 

 tal row are shown at the left a spermatogonial group, in the middle a polar view 

 of the first spermatocyte-division, at the right a side-view of the same division.) 

 a-c, Protenor belfragei; d-f, Leptoglossus phyllopus; g-i, Anasa tristis; j-l, 

 Pachylis gigas. 



