l82 CARRIE I. WOOLSEY. 



Plate IV. 

 J amaicana subguttata Walker. 



First spermatocyte figures of No. 503. 



Fig. 38. Polar view prophase of first spermatocyte showing fifteen simple 

 autosomes, the V-multiple, and the "accessory" chromosome. The latter is en- 

 closed in a receptacle apart from the other chromosomes. 



Figs. 39-41. Lateral view metaphase of first spermatocyte showing the 

 multiple chromosome. The constrictions in the arms of the V show where the rod 

 mates are about to pass to the opposite pole, breaking away from the multiple at 

 the constricted places. The full number is not present but the accessory is promi- 

 nent in 39 and 40. 



Fig. 42. A spermatocyte figure showing the full number, 15, of tetrad chromo- 

 somes plus the double tetrad, plus the sex chromosome. 



Fig. 43. First spermatocyte showing double tetrad and the accessory chromo- 

 some. 



