164 CARRIE I. WOOLSEY. 



438, a nymph and 503, a small male of Jamaicana suhguttata. 



In determining the number of chromosomes in the various 

 individuals, I have, in all cases, made drawings from not only- 

 different cysts, but from different follicles ao well. In a few 

 instances where the figures are particularly clear and distinct, I 

 have taken more than one cell from the same cyst (Nos. 30, 31, 

 33) but where this was done I made additional drawings from 

 other parts of the testes. There can be no doubt as to the 

 character or appearance of these figures. 



Observations. 

 Jamaicana flava n. sp. Caudell. 



All chromosomes are of the rod type. One individual shows 

 two pairs of peculiarly associated chromosomes in the spermato- 

 gonial division figures. 



In my comparison of species, the description of /. flava should 

 logically come first since the chromosomes here are all of the rod 

 shaped, simple type, and are not sufficiently associated to form 

 multiples. They also vary the least in their behavior from what 

 we might consider the original or primitive condition of the 

 species of this genus. To distinguish individuals of the same 

 species, I shall refer to each by number. Nos. 589 and 588 

 belong to /. flava. 



In individual 589, I found the number of chromosomes to be 

 thirty-five. They are all rod-shaped, varying in size from the 

 large unpaired accessory chromosome which I have numbered 

 18, through a graded series of pairs indicated by number, 

 according to their size from 17 to i. 



In a polar view of a spermatogonia! metaphase figure, the 

 seventeen or eighteen largest chromosomes are found, as a rule, 

 on the periphery in no fixed position or order, with the smallest 

 pairs clustered about in the center. This is quite well shown in 

 Figs. 3 and 4 while Figs, i and 2 show some of the larger chromo- 

 somes in the center of the figure where they have probably 

 displaced the smaller ones through some accident in previous 

 mitoses. There seems to be nothing unusual or irregular in the 

 number or relation of chromosomes here either in spermatogonia! 

 or spermatocyte divisions. 



