Figure 4-19. Photomicrograph of SaUvary Chromosome 4 of Chironomiis 

 tentans Showing One Large Balbiani Ring and Two Smaller Rings Located 

 Near the Terminal Ends of the Chromosome. (From Beermann, W., 1959. 

 "Chromosomal Differentiation in Insects," in "Developmental Cytology," 

 D. Rudnick (Ed.), Ronald Press, New York, N.Y., Plate VI, p. 94. Courtesy 

 of Dr. Wolfgang Beermann, Zoologisches Institut, Universitat Marburg, Ger- 

 many.) 



100 / CHAPTER 4 



