(2 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
"hin, 
continuous at the central pole and that at no time is there a distinct 
vesicle for each chromosome. It is impossible to distinguish the mon- 
osome with certainty during this stage as Sutton (:00, :02) has been 
able to do in Brachystola, but in some cases one of the chromosomes 
has a somewhat different appearance and is surrounded by a more 
distinet vesicle. Judging from Sutton’s work, this is probably the 
Fics. B.-_E.— Polar views, metaphase of spermatogonia showing autosome 
pairs. X 1450. . 
Fies. B and C.— Dissosteira carolina. 
Fig. D.— Arphia tenebrosa. 
Fig H.— Chortophaga viridifasciata. 
monosome, but in this species the difference from the other chromo- 
somes is not great enough to render it distinguishable in most cases. 
However, even at the height of the resting stage there can sometimes 
be recognized a more or less distinct vesicle in which the chromatin is 
more densely aggregated than elsewhere. ‘This vesicle with its more 
deeply staining chromatin usually extends out into the cytoplasm near 
