CHROMOSOMES IN THE SVERMATOGENESIS OF THE HEMII'TERA HETEROl'TERA. 131, 



There were no clear cases of second maturation mitoses. But judging from the 

 colnpo^iti()n and behavior of the elements in the first spermatocytes, there would Ije 

 in the spermatogonium : G univalent diplosomes and 2G univalent autosomes. 



34. Prionidus cristatus Linn. 



My former account (19016) was correct in the main. 



A new drawing of a spermatogonic monaster is given (Phite XIll, Fig. 251 ). Of the 

 2G chromosomes 2 are much larger {A, a) ami 2 much smaller {L, I) than the others. 

 All these are found on careful inspection to he arrangeable into a series of pairs, A, 

 a-M, )ii, in which the two components of each pair are of approximately equal volume 

 except the 2 marked A", k. There is probably no monosome l)ecause the number is 

 an equal one. 



In the complete i-est stage of the spermatocytes are found 3 or 4 safraninophilous 

 bodies (Fig. 252, Di. 1, Di. 3, Di. 3) attached to the surface of a large, more or less 

 central, plasmosome {PI). They are of unequal volumes; and when there are 3 of 

 them each appears bipartite, while when there are 4 the 2 smallest are each unipartite. 

 Perhaps, as in Sinea, these relations are to be interpreted as 3 bivalent diplosomes, the 

 smallest of which may sometimes have its parts separated. 



BEL0ST03IATIJXE. 

 35. Zaitha sp. 



Sperviatogonic Division. — In all of eight clear pole views 24 chromosomes were 

 counted (Plate XIII, Fig. 253). They are of very different volumes, 4 being much larger 

 and 2 much smaller than any of the others. They make up 1 1 pairs gradated both 

 in form and size {A, a-K, k), all these being autosomes ; and 1 pair of 2 unequal com- 

 ponents [1)1, dl) that correspond to the diplosomes of the later stages. The 4 largest 

 autosomes are about equal in length, but 2 of them (.4, a) are thicker than the others 

 (/>', b). The 2 smallest elements (K, k), are always slightly different in volume. 



Growth Period. — This terminates with a complete rest stage of short duration. 

 In it is found a single spherical plasmosome (PI, Fig. 254), and attached to its surface 

 either 2 or 3 smaller rounded bodies, Di. 1, di. 1. The most frequent condition is that 

 figured, and these smaller bodies probably represent the unequal diplosomes of the 

 spermatogonium, the bipartite nature of the larger being due to a splitting. The 

 amount of cytoplasm is relatively great and it contains towardsjthe end of the growth 

 period, besides one or a few small yolk sphei'ules {Yk), 3 or 4 rather dense bodies [Id] 

 more or less spherical in form, staining like the cytoplasm ; they are variable in posi- 

 tion and size but are usually close to the nucleus. Each one has a considerable resem- 



