252 PROCEEDINGS OF THE ACADEMY OF [1899. 



fof speciosa. It may perhaps be questioned whether all five of 

 these species are congeneric, but until a study is made of the male 

 genitalia of torrida and of sjjeciosa, it will be advisable to retain 

 them as they here stand. 

 Zyg-onyx ida Selys. 



The data for characters 1-7 are based on personal examination 

 of a male and a female from Java, by Herr Fruhstorfer, given 

 me at the Konigliche Museum fiir Naturkunde at Berlin, and a 

 female from Trong, Lower Siam, by Dr. "VV. L. Abbott, in the 

 U. S. National Museum. For Nos. 8-13, the descriptions of 

 Baron de Self's {Ann. Soc. Ent. Belg., xxxv, CR., p. ccxxviii, 1891, 

 13 d", 5 9) and Dr. Karsch (Berl.\Ent. Zeit., xxviii, p. 21, 

 1893, 9 d", 4 9 ; Ent. Nach., xxi, p. 203, 1895) are also available. 



Variations: 3. Distinctly shorter on the second tarsi only of the 

 Siamese female. 6. Two double cells in one front wing of the 

 male and of one front wing of one female, one double cell in all 

 the wings of the other female. 7. A little nearer in three out of the 

 twelve wings. 8. One in one front wing of one male. 9. Crossed 

 in three females (Selys). 10. Crossed in seven males, five females, 

 free in six males (Selys) ; in some free, in some asymmetrically or 

 symmetrically crossed (Karsch). 11. The statement in the table 

 is from de Selys, I.e. ; I find it one-celled in one wing of one male 

 and of one female. 

 Zygonyx iris Selys. 



The statements in the table are all drawn from Baron de Selys' 

 description, I.e., p. ccxxxi. 



Variations: 3. " Asymetriquemeut un peu plus courte a I'un des 

 tarses" (Selys). 



CONCLUSIONS 



Owing to the small number of individuals of these species which 

 it was possible to examine, I have thought it undesirable to calcu- 

 late the percentages of variations, as was done for Macrothemis. 



When the exclusively American Dythemis, PaUothenm, Brech- 

 morhoga, Scapmiea^ and 3facrothemis are compared with Schizonyx^ 



'" I was in error when I stated by implication (Proc. Bost. Soc. Nat. 

 Hist., xxviii. p. 303) that the nodal sector of Scapa/ica is invariably not 

 Avaved. In some individuals it is waved, as Mr. McLachlan has pointed 

 out to me by letter, but I am mt able to say which of these two conditions 

 is the predominant one, owing to inability to examine a long series of 

 specimens. 



