96 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
5. Davis (’08), Acrididae and Locustidae. 
6. Buchner (’09), Gryllus, Oedipoda. 
7. Stevens (’10b), Forficula. 
8. Brunelli (’09, ’10), Gryllus, Tryxalis. 
b. Second maturation division reductional. 
Sutton (’02, ’03), Brachystola. 
Baumgartner (’04), Gryllus. 
McClung (’05, ’08a, ’14), various Orthoptera. 
Stevens (’05), Stenopalmatus. 
Nowlin (’08), Melanoplus. 
Pinney (’08), Phrynotettix. 
Robertson (’08) Syrbula. 
Carothers (’13), Acrididae. 
B. Parasynapsis assumed or described. 
a. First maturation division reductional. 
1. Gerard (’09), Stenobothrus. 
2. Morse (’09), Blattidae. 
3. Stevens (7122), Ceuthophilus. 
4. Robertson (’15), Tettigidae. 
b. Both divisions equational. 
1. Vejdovsky (’11-12), Locustidae. 
e. Division neither reductional nor equational. 
1. Otte (’07), Locusta. 
00. St Se ae eek Deeie 
This classification | is interesting from two points of view. In the 
first place, it indicates the diverse results that have been obtained by 
the various investigators working on a limited group within which one 
might reasonably expect to find a high degree of uniformity in chromo- 
somal behavior. In the second place, the results that I have obtained 
do not come under any of the classes in the above outline. As stated 
on previous pages, I have shown (1) that the spermatogonial chromo- 
somes develop into the fine leptotene threads, which conjugate by 
parasynapsis without the conjugants losing their identity, that is, the 
line of conjugation is visible throughout the growth-period as the 
“primary longitudinal split’; (2) that a second longitudinal split at 
right angles to the first occurs in the early postspireme stages; and 
(3) that the tetrads become so oriented on the first maturation spindle 
that the resulting division is equational. Each of the dyads of the 
second spermatocytes consists of parts of the two original conjugants, 
1] have omitted reference to some papers which were non-committal on the points under 
discussion. 
