540 j\jr. W. F. Kirby on the Sj)ecies which have 



two species, Z. iris and Z. ida, with the triangle traversed 

 and the liind wings rounded in the male. 



De Selys (4, 5) then described a new species from tlie 

 Seychelles under the name of Zygonyx luct>'fera, differing 

 from typical Zygonyx in having only one cross-nervure in 

 the lower basal cells of all the wings and the last antenodal 

 cross-nervure of the fore wings discontinuous. He says that 

 ida is the type of Zygonyx^ but that Brauer has made iris 

 the type, which differs in having the triangles traversed (but 

 this character having been insisted on from the first, excludes 

 ida as a possible type, and De Selys' arbitrary alteration 

 cannot be admitted). De Selys (G) incidentally mentions 

 Zygonyx as belonging to the Libellulidte. 



Karscli (7) discriminates between Zygonyx and his new 

 Schizonyx ; but though he mentions ida as the type of the 

 former, the characters given apply only to iris, and ida 

 j)Ossesses almost every character assigned by Karsch to 

 Schizonyx. 



(8) De Selys, for the first time, fully describes Z. ida and 

 Z. iris. 



(9) Calvert compares Zygonyx with various allied genera. 

 According to the description, Zygonyx {iris) differs from 



Zygonidia in a variety of characters, some of which I have 

 already pointed out. It is also probably a shorter-winged 

 insect. 



Zygonyx iris, Hagen and De Selys. 



Ilagen (1) ; Brauer (2, 3) ; De Selys (4, 5, 8). 

 \\Zyyonyx ida, Karsch, Berl. eut. Zeitscbr. xxxiii. p. 281 (1890). 



Hah. Bengal. 



Not in the collection of the Natural History Museum, nor 

 does Prof. Calvert appear to have seen a specimen. 



Genus Zygonidia, Kirb. 



Zygonidia, Kirb. {antea, p, 532). 



Zygonidia insignis, Kirb. {antea, p. 533). 



IJab. Hainan. 



I refer to my previous remarks for all particulars relating 

 to this genus. 



