— 
74 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. , 
again, the chromosomes are evidently in pairs. Next in size to the 
three largest pairs (1, 2, 3) is an unpaired chromosome (4), the mono- 
some. ‘lhen in a series of diminishing sizes we have the pairs 5, 6, 7, 
8,9, 10. As in the preceding species, there are two pairs, 11 and 12, 
J it 
Fic. F.— Polar view, metaphase of spermatogonium in Hippiscus tuberculatus 
showing autosome pairs.  X 1450. , 
Fic. G.— Polar view, metaphase of spermatogonium of Melanoplus femoratus 
showing autosome pairs. XX 1450. 
Fias. Ha, Hb.— Successive sections of odgonium of Hippiscus tuberculatus 
during prophase showing autosome pairs.  X 1450. 
2 8e yer el 
which are much smaller than the rest. Figures Ha and [1b represent 
two successive sections of an odgoniwm of this species in the late pro- 
phase. Here there are plainly twenty-four chromosomes, all of which 
can be readily arranged in twelve pairs. A comparison of these with 
Figure F will show that these pairs correspond exactly with those of 
