532 Mr. W. F. Kirby on Odonata from Hainan. 



3. Crocothemis servilia. 



LihelMa servilia, Drury, 111. Exot. Ent. i. pi. xlvii. fig. 6 (1773). 

 Crocothemis servilia, Kirb. Cat. Neur. Odon. p. 21. n. 3 (1890) ; Karsch, 



Ent. Nachr. xvii. p. 246 (^1391) ; McLaclil. A.nn. & Mag. Nat. Hist. 



(t3) xvii. p. 3G6 (189G). 



A single .specimen only. 



As Dr. Karsch remarks, this species might easily be mis- 

 taken for Orlhetrum testaceum, Burm., but that the last 

 antenodal cross-nervure on the fore wingfs is not continuous. 



Zygonidia, gen. nov. 



Frontal tubercle broad, not bifid ; abdomen moderately 

 long and slender, with a strong transverse carina on the third 

 segment and a slighter one on the second, and a strong dorsal 

 carina commencing on the third segment ; segment 2 shorter 

 than broad, 8 one and a half times as long as broad, 4-8 

 more than twice as long as broad, 9 a little longer than broad, 

 10 half as long as broad. Appendages of the second segment 

 rather small; anal appendages slender and about as long as 

 the ninth segment ; lower appendage scarcely shorter than 

 the others. Eyes large, connected for a moderately long 

 space, and slightly expanded behind. Legs rather long ; 

 claws bijid ; femoia and tibiae very finely serrated on the 

 upper carina ; femora beneath with numerous small teeth, 

 mostly directed towards the knee, and with a few very long 

 fine bristles towards the extremity ; tibiee set with long fine 

 liairs or bristles beneath. 



Wings rather long and pointed, moderately broad ; ptero- 

 stigma rather short ; fore wings with 16-19 antenodal and 

 10-11 postnodal nervures, the last antenodal normally 

 continuous-, nodal sector waved, sectors of the aiculus 

 stalked, rising at two thirds of its length ; lower basal cell 

 long and narrow, with a second cross-nervure towards the 

 extremity; triangle rather small, traversed by one nervure, 

 and followed by three rows of cells, increasing ; lower sector 

 of the triangle separated from the upper, and rising distinctly 

 "uelow the apex of the triangle, from which the upper sector 

 rises ; subtriangular space consisting of 3 cells ; no supra- , 

 triangular nervures. Triangle of the fore wings often rising 

 distinctly beyond the level of that of the hind wings, which is 

 traversed by a nervure, and extends nearer the base than the 

 level of the arculus ; no supratriangular nervures, one cross- 

 nervure only in the lower basal cell of the hind wings ; sectors 



