STUDIES ON CHROMOSOMES 



89 



J 



Y 

 ft 



t 

 X 



to 



m 



?* 'I 1 ' 1 | 



^ P 



r 



i' 4 



* 









 /' 



ft 



X 



Fig. 5 Comparison of the XY-group in various Hemiptera. (a-i are orig- 

 inal; the others from Payne.) a, 6, Thyanta custator, 'A form,' second division 

 in side view; c, d, corresponding views of the 'B form'; e-h, anaphases of same; 

 i, polar view of first division of same; j, k, metaphase chromosomes, second divi- 

 sion, Diplocodus exsanguis; i, similar view of Rocconota annulicornis; TO, similar 

 view of Conorhinus sanguisugus; n, Sinea diadema; o, Prionidus cristatus; p, 

 Gelastocoris oculatus; q, anaphase chromosomes of the same species; r, the XY- 

 group, from the second division, Achollamultispinosa; s, diagram, slightly modified 

 from Payne, to show the distribution of the XY-components in the second divi- 

 sion of the same species. 



JOURNAL OF MORPHOLOGY, VOL. 22, NO. 1 



