272 MB. W. i\ KIRBY — A EBVISION OF 



clearly defined, consisting of very numerous cells; sectors of the arculus separated, 

 nodal sector slightly waved, subnodal sector and lower sector of the arculus continuous, 

 space between the nodal and subnodal sectors bisected or reticulated ; hind wings 

 distinctly longer than the fore wings, and rather broader, with 12-19 antenodal and 

 about the same number of postnodal cells, some of the latter occasionally bisected, the 

 first two to four postnodals and sometimes the last antenodal not continuous ; triangle 

 unusually long, crossed by three or more nervures, and often reticulated, followed by 

 numerous cells, its boundaries sometimes indistinct, one or two supratriangular 

 nervures; the lower basal cell crossed by two nervures, and sometimes with the 

 extremity reticulated, sectors of the triangle united at base: anal appendages rather 

 short. 



Type Libellula pullata, Burm. 



Genus 13. Potamothemis, g. n. 



Frontal tubercle rounded, hardly depressed in the middle ; eyes contiguous ; abdomen 

 rather slender, shorter than the hind wings, the basal segments not thickened, 2-4 

 transversely carinated, segment 8 not perfoliate in the female, pterostigma long : fore 

 wings with a concavity on the costa between the base and the nodus, with about 

 13 antenodal and 8 postnodal nervures, the last antenodal and the first three or four 

 postnodals not continuous, cells of the costal areas simple, the triangle rather large, 

 placed on a level with that of the hind wings, crossed by one or two nervures, no 

 supratriangular nervures, subtriangular space consisting of 3-8 cells, sectors of the 

 arculus separated (also in the hind wings), lower basal cell free, nodal and subnodal 

 sectors and lower sector of the arculus continuous, the cells on the outer half of the 

 space between the nodal and subnodal sectors bisected ; hind wings a little longer than 

 the fore wings, but veiy slightly broader, with 7-8 antenodal and as many postnodal 

 nervures, the first three or four of the latter not continuous, the triangle rather long, 

 traversed by 1-3 nervures, and followed by 4-5 rows of cells, no supratriangular 

 nervures, two cross nervures in the lower basal cell, sectors of the triangle separated at 

 base : anal appendages moderate. 



Type Libellula fasciata, Linn. 



Genus 14. Palpopleuea. 

 (Neuration, Plate LVI. fig. 6.) 

 Rambur, Ins. Nevr. p. 129 (1842); Brauer, Verb, zool.-bot. Ges. Wien, xviii. pp. 365, 717 (1868). 

 Frontal tubercle truncated ; eyes contiguous ; abdomen rather broad, sometimes 

 slightly depressed, shorter than the hind wings, and broadest in the middle, basal 

 segments not thickened, segments 2-4 transversely carinated, dorsal carina strongly 

 marked, segment 8 not perfoliate in the female ; pterostigma long, often bicoloured : 



