THE SUBFAMILY LIBELLULINvE. 267 



of from 7-12 cells, followed by 6-8 rows of cells, 5-6 supratriangular nervures, 3-6 cross 

 nervures in the lower basal cell, subtriangular space ill defined, consisting of about 

 forty cells, sectors of the arculus separated or rising from a very short stalk, and 

 strongly arched at the extremity, nodal and subnodal sectors greatly waved beyond the 

 middle, and strongly arched towards the extremity, where the subnodal sector is some- 

 what broken, the intermediate cells bisected just before the hind margin, sectors of the 

 triangle subparallel, separated by a double row of cells ; hind wings more than twice 

 as broad as the front wings, with 15-17 antenodal and 20-21 postnodal nervures, the 

 first four postnodals not continuous, triangle narrow, crossed by four or five nervures, 

 its base nearly coinciding with the arculus ; followed by 6-7 rows of cells increasing, 

 1 supratriangular nervure, 1-2 cross nervures in the lower basal cell, sectors of the 

 triangle rising close together, spines of the hind tibiae rather short and strong : anal 

 appendages of male a little longer than the ninth segment ; the lower appendages as 

 long as the others, broad, pointed, triangular; appendages of the second segment 

 small. 



Type Neurothemis gigantea, Brauer. 



The characters of this genus are taken partly from Brauer's description (Verb, zool.- 

 bot. Ges. Wien, xvii. p. 8, 1867) and partly from a male in the British Museum. I 

 have not ventured to figure it, because it is from Morty Island (the locality given by 

 Brauer being Amboina), and because the neuration does not quite agree with Brauer's 

 description. Until more specimens are obtained it would be rash to hazard an opinion 

 as to whether this specimen is distinct from Brauer's species or not ; but it is certainly 

 congeneric with it, and cannot be conveniently retained in Neurothemis, although that 

 genus is used at present in a rather elastic sense. 



Genus 5. Antidythemis, g. n. 

 (Plate LI. fig. 4.) 

 Frontal tubercle wide, not distinctly depressed in the middle ; eyes contiguous in 

 the middle ; abdomen moderately slender, with parallel sides, the basal segments hardly 

 thickened, segments 2-4 transversely carinated, dorsal and lateral carinas fairly well 

 marked, segment 8 not perfoliate in female : wings long and rather pointed at the tips, 

 pterostigma very long ; fore wings with 24-25 antenodal and 13-17 postnodal nervures, 

 the last antenodal and the first three or four postnodals not continuous, cells of the 

 lower postnodal space simple, triangle long and narrow, placed a little beyond the level 

 of that of the hind wings, traversed by 3-4 cross nervures, and followed by five rows of 

 cells, a supratriangular nervure occasionally present, lower basal cell long and narrow, 

 crossed by one nervure at one fourth of its length, and by two or three others close 

 together near its extremity, subtriangular space consisting of 9-11 cells, sectors of the 

 arculus rising close together from a point, subparallel, arched at the extremity, nodal 

 sector and the cells between the nodal and subnodal sectors more or less irregular from 



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