A Comparative Study of the Chromosomes in the 
Spermatogenesis of Enchenopa binotata (Say) and 
Enchenopa (Campylenchia Stal) curvata (Fabr.). 
By 
Sidney I. Kornhauser. 
(Contributions from the Zoölogical Laboratoiy of the Museum of Comparative 
Zoölogy at Harvard College, No. 244). 
With 8 Textfigures and Plates XVUI — XXII. 
Synopsis. 
Page 
I. Introduction 242 
II. Synopsis of previous papers on the chromosomes in Hemiptera .... 242 
III. Material and methods 246 
IV. Systematic relation of the insects 247 
V. Structme of the festes and ovaries 249 
VI. Observations on spermatogonia and oögonia 250 
A. Enchenopa hinotata 250 
B. Enchenopa curvata 252 
C. Comparison of the diploid groups of Enchenopa hinotata and Enchenopa 
curvata 254 
VII. Growth period of Spermatocytes 255 
A. Enchenopa hinotata 255 
B. Enchenopa curvata 261 
C. Comparison of the growth period and tetrad formation in Enchenopa 
hinotata and Enchenopa curvata 267 
VIII. Division of first spermatocyte 269 
A. Enchenopa hinotata 269 
B. Enchenopa curvata 270 
C. Comparison of the first spermatocyte division of Enchenopa hinotata 
and Enchenopa curvata 271 
IX. Division of the second spermatoc}de 272 
A. Enchenopa hinotata 272 
B. Enchenopa curvata 273 
C. Comparison of the second spermatocyte division of Enchenopa hinotata 
and Enchenopa curvata 274 
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