Sperfiiatogenesis 489 



plate is not nearly so large as in the same stage of Ceresa taurina 

 (Fig. 63). Fig. 82 represents one of the most extreme cases of 

 the growth stage. 



Ceresa diceros 



The shape and size of this species is about the same as in Ceresa 

 bubalus, but the coloring is different, being brown and white, 

 instead of uniform green. The spermatogenesis is practically the 

 same, as Figs. 93 to loi show, but a preparation from the testis of 

 one could be distinguished from a preparation of the other, because 

 the cells, chromosomes, and spindles of C. diceros are always 

 smaller than those in C. bubalus. 



Atymna castanea 



This species was found on the chestnut trees exclusively, and was 

 very abundant at the end of June and beginning of July. No 

 spermatogonial plates in which the number of chromosomes could 

 be counted were found. The odd chromosome appears in the rest 

 stage as a large round body with a smooth contour and an affinity 

 for basic stains (Fig. 102). In lateral view of the metaphase of 

 the first spermatocyte division, it is apparent that it does not divide 

 (Figs. 104 and 105), and in the anaphase it has the position usually 

 characteristic of this order, between the plates of chromosomes, but 

 nearer one pole than the other (Fig. 106). The number of chro- 

 mosomes in the first spermatocyte is again 11 (Fig. 103), two of 

 them constantly larger than the others (a and b). These two large 

 chromosomes appear in all the second spermatocyte plates, 

 whether they have 1 1 or 10 chromosomes (Figs. 107 and 108). 

 All the spermatids contam a chromatin nucleolus (Fig. Ill), as in 

 the genus Ceresa. There being apparently no other basic-staining 

 body in any of the spermatids, the odd chromosome in half of them 

 must take part in the formation of the general reticulum like the 

 other chromosomes. 



Campylenchia curvata 



Campylenchia curvata was found in sweepings from various 

 weeds throughout July. The material showed all desirable stages. 



