PLATE 5 



EXPLANATION OF FIGURES 



Phrynotettix (93-96), Lygaeus (97-100), Largus (101-104), Orieopeltus (105- 

 108). From sections, excepting 107, 108, which are from smear-preparations. 

 The figures of Phrynotettix enlarged 1500 diameters, the others 2250 diameters. 



93-95 Spermatogonial prophases of Phrynotettix. Fig. 93 is an early stage, 

 showing massive polarized bodies. The other figures show the uncoiling of the 

 spireme-threads from these bodies, 94 in side view (photo. 31), 95 as viewed from 

 the pole (photo. 30). Fig. 96 shows two successive stages lying side by side in the 

 same cyst (photo. 32). 



97 The confused stage (Stage g) in Lygaeus. 



98-99 Early prophases (Stage h) from Lygaeus. 



100 a-h Isolated chromosome-nucleoli, from Stages/ and g in Lygaeus. showing 

 various forms of the sex-chromosomes assumed during the growth-period. 



101-103 Largus cinctus. Nuclei transitional from Stage/ (diplotene) to Stage 

 g (confused period). 



104 Nucleus of the confused period. Largus cinctus. 



105-106 Early prophase-nuclei, Oncopeltus (early Stage h). 



107 (photo. 17) Slightly later prophase-nucleus of Oncopeltus, showing early 

 bivalents. 



108 (photo. 18) Later prophase of the same, early Stage i. 



440 



