282 ME. W. F. KIEBT— A EEVISION OF 



Genus 30. Macrodiplax. 

 Brauer, Verh. zool.-bot. Ges. Wien, xviii. pp. 366, 737 (1868). 



Frontal tubercle with a very slight depression in the middle ; eyes contiguous ; 

 abdomen moderately stout, cylindrical, hardly thickened at the base, shorter than the 

 hind wings, segments 2-4 carinated : wings rather long, and pointed at the tip, ptero- 

 stigma short ; fore wings with 6 antenodal and 6-7 postnodal nervures, a wide space 

 between the last postnodal and the pterostigma, only three nervures in the lower 

 postcostal area before the pterostigma [this character is probably not constant], triangle 

 rather broad, free, followed by two rows of cells, sectors of the arculus with short 

 stalks, nodal sector hardly waved ; hind wings very broad. 



Type Diplax cora, Brauer. 



Not in the British Museum ; the characters are compiled from Brauer's description. 



Genus 31. Urothemis. 

 Brauer, Verh. zool.-bot. Ges. Wien, xviii. pp. 175, 366, 437 (1868). 



Frontal tubercles truncated ; eyes large, contiguous in front for two third's of their 

 length ; abdomen moderately stout, slightly thickened at the base, and very gradually 

 tapering, generally shorter than the hind wings, segments 2 and 3 carinated, segment 8 

 not perfoliate in female : wings moderately long and broad, pterostigma rather short ; 

 fore wings with 6-7 antenodal and 5-8 postnodal nervures, the first two postnodals not 

 continuous, cells of the postnodal area simple, triangle rather broad, slightly beyond 

 that of the hind wings, nearly always free, the base nearly straight ; followed by two 

 rows of cells, increasing, or the first row of three followed by two, increasing, no supra- 

 triangular nervures, one cross nervure in the lower basal cell, subtriangular space 

 consisting of three cells, sectors of the arculus rising from a point or from a very short 

 stalk, the lower sector gradually curved, a little irregular beyond the middle, nodal 

 and subnodal sectors nearly straight, the former slightly waved at the base only, the 

 intermediate cells only bisected close to the hind margin ; hind wings rather broader 

 than the fore wings, with 5-6 antenodal and 7-8 postnodal nervures, the first two 

 postnodals not continuous, triangle rather large, free, its base corresponding with the 

 arculus, and its outer angle meeting the lower sector of the arculus, followed by two 

 rows of cells (the first row sometimes divided into three), increasing, no supratriangular 

 nervures, one cross nervure in the lower basal cell, sectors of the triangle united at the 

 base: anal appendages of the male shorter than the last two segments, the lower 

 appendage nearly as long as the others ; appendages of the second segment not 

 conspicuous. 



Type V. bisignata, Brauer. 



The type is not in the British Museum, and the present description has been drawn up 

 from a comparison of iAbellula sanguined, Burm., signata, Bamb., designata, Selys, &c. 



