Mr. W. F. K'why on Odonata from Hainan. 533 



of the triangle narrowly separated at the base. Hind wingn 

 broader than the fore wings, with the anal angle rounded ; 

 nieinbranule rather small. 



Agrees with Zi/(jon)/.v, Ilagen, in many of its characters, 

 but sufficiently distinct by the last antenodal cross-nervure 

 of tlie fore wings being continuous (it is discontinuous on 

 one side in one specimen), tiie longer pterostigina, the tri- 

 angle of the hind wings being only followed by two rows of 

 cells and its sectors almost united ; the large number of cross- 

 nervures, &c. 



From Frotortheniis, Kirb., to which it is also allied, it 

 differs in its bifid claws, longer ami slenderer abdomen, 

 and in the form of the triangle of the hind wings. 



'Jhe genera allied to Zi/yvnijx are so little known and the 

 synonymy is so confused that 1 lind it necessary to disentangle 

 it, as lar as the imperfect materials at my disposal at present 

 will permit. My results will be found in a supplementary 

 paper {itifrh, y>. 539). 



4. Zygonidia insiijnis, sp. n. (PI. XII. fig. I.) 



Long. Corp. 53-56 millim.; exp. al. 105-lOb millim. ; lat. 

 al. ant. 11 millim. ; long. pter. 4^-5 millim.; lat. al. post. 

 12 millim. 



Male. — Head rich purple abovo, the Irons narrowly 

 bordered below with yellow, expanding into a large yellow 

 spot on each side ; nasus black, the sides and a small mark 

 in the middle in front yellowish ; rhinarium yellow ; lower 

 mouth-parts black, with the base of the mandibles and the 

 sides of the mentum broadly yellow ; back of head black, 

 slightly spotted with yellow on the sides. 



Thorax and abdomen black above ; 3 yellow iuteralary 

 spots, the first irregular, between the hinder part of the bases 

 of the fore wings, the second longitudinal, and the third 

 transverse, between the bases of the hind wings. Abdomen 

 with the lateral carina (except that on the third segment), 

 the longitudinal carina as far as the seventh segment, and the 

 sutures to the end of the third segment narruwly marked with 

 yellow; there is also a slight transverse yellow mark at the 

 end of the fourth segment and others on the sides at the end 

 of the fifth and sixth segments. Pectus and pleura reddish 

 testaceous, the pleura witli two large coppery-greon spots, 

 thebindermost greenest. Legs black, coxie testaceous. First 

 three segments of the abdomen beneath and on the lower part 

 of the sides mostly testaceous, interrui)ted with black behind 

 the segments and along the lateral carinte ; there is also a 



