PLATE 31. 
Melanoplus differentialis. 
Fics. 1 to 4.—Spermatogonia, with full number of twenty-three chro- 
mosomes seen in equatorial plate. 
Figs. 5 to 14.—First spermatocytes seen in equatorial plate; rings 
vary from one to two. 
Fies. 15, 19, 20, 21, 25, 26—Side view of chromosomes and spindle. 
Fics. 22, 23.—Equatorial plates, with second spermatocyte from the 
same mother cell. One shows the eleven chromosomes while the other 
shows twelve. 
Fic. 24.—Equatorial plate of second spermatocytes, showing twelve 
chromosomes. 
