CHROMOSOME-GROUPS OF METAPODIUS AND BANASA. 311 



indeed possible since the Paulmier slides were not accompanied 

 by the original specimens. But the exact similarity of the two 

 forms in every respect apart from the unpaired chromosome, and 

 my failure to find any other similar form in an examination of 

 nearly all the species of Pentatomidae that might be confused 

 with this species, leads me to believe that the case of Banasa 



a 







* 



b 



*/ 



FIG. 2. Banasa. (af, B. ra/z>a, gj, B. dimidiata.') a, Long Island form 

 (Paulmier), first spermatocyte-division ; b, 14-chromosome type of second division; 

 c, 13-chromosome type, from the same cyst ; (/, western form (Colorado), first sperma- 

 tocyte-division ; e, second division of same ; f, spermatogonial division; g, B. Jimi- 

 diata, first division ; h, second division, polar view ; ?', side view of same ; /, sperma- 

 togonial group. (In a it is impossible to distinguish between the ^-chromosome and 

 the small idiochromosome. ) 



calva is probably similar to that of Metapodius tenninalis, the 

 Long Island form being of one type (corresponding to Type A 

 of Metapodius, with an unpaired ^-chromosome) and the others 

 of the other type (corresponding to Type B of Metapodius). In 

 Metapodius the two types occur side by side in the same locality ; 



