484 D. H. WENRICH 



4. A constriction occurs at the synaptic points in most of 

 the tetrads of the atelomitic chromosomes. 



5. A small plasmosome-like appendage, or chromomere- 

 vesicle, is attached to the conjugants of the largest pair of 

 atelomitic chromosomes (no. 9) at the apex of the V (synaptic 

 point. A similar appendage is occasionally found at the homol- 

 ogous point on the other two atelomitic pairs, and occurs very 

 constantly on the accessory chromosome. 



B. Trwierotropis suffusa 



a. Introductory statement. Trimerotropis belongs to the sub- 

 family Oedipodinae of the family Acrididae. A discussion of 

 some systematic problems connected with this genus will be 

 found in the paper by Dr. Carothers ('17). The material 

 from which the drawings were made consisted of a single 

 smear made by Dr. Carothers and loaned to the writer for 

 study. This indi\ddual corresponds to her number 34 (plate 6) 

 (T7) and cell E on my plate 2 is the same as that drawn by her. 

 Other individuals were studied but no drav/ings from them are 

 used in the plates. 



The reasons for using a smear preparation in this case are 

 the same as those already stated in connection with Chorthippus. 

 This smear was fixed in Flemirdng's solution and stained by 

 Flemming's tri-color method. The chromatin was not so 

 deeply stained in this smear as it was in the smears of Chor- 

 thippus, and this difference appears in the drawings. 



b. The post-spireme chromosomes. As Carothers has found, 

 the reduced number of chromosomes in this genus is twelve. 

 Occasionally, however, supernumerary chromosomes occur, as 

 she discovered, and one such supernumerary occurs in this in- 

 dividual, making the number of first spermatocyte elements 

 thirteen instead of twelve. 



The arrangement of the chromosomes in plate 2 is the same 

 as for Chorthippus in plate 1. Each vertical column repre- 

 sents the complete series of chromosomes from a single cell ar- 

 ranged in the order of size with the smallest at the bottom. 



