PLATE 5 



EXPLANATION OF FIGT^RES 



Phrynotettix (93-96), Lygaeus (97-100), Laigiis (101-104), Oncopeltus (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 Spermatogonia! 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 bj- 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 /;). 



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

 bivalents. 



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



440 



