286 ME. W. P. KIEBY — A EEVISIOJM OF 



present, three or four nervures in the lower basal cell : anal appendages of the male 

 nearly as long as the eighth segment, lower appendage broad, triangular, not shorter 

 than the others, sectors of the triangle united at base ; appendages of the second 

 segment prominent. 



Type Lyriothemis cleis, Brauer. 



The type is not in the British Museum, which, however, possesses three other closely 

 allied species, from which the preceding description is chiefly drawn up. 



Genus 38. Okthemis. 

 (Plate LIV. fig. 1 ; neuration and details, Plate LVII. figs. 3, 3 a-e, 5, 5 a.) 



Hagen, Neur. N. Amer. p. 160 (1861); Brauer, Vert, zool.-bot. Ges. Wien, xviii. pp. 367, 729 



(1868). 



Frontal tubercle broad, concave in the middle, forming two obtuse projections ; 

 abdomen moderately stout, of nearly uniform breadth throughout, a little shorter than 

 the hind wings, segments 2 and 3 carinated, segment 8 perfoliate in female : wings long 

 and rather pointed, pterostigma very long, placed near the tips; fore wings with 16-18 

 antenodal and 11-14 postnodal nervures, the first three postnodules not continuous, 

 cells of the postnodal area simple, triangle moderate, rather beyond the level of that 

 of the hind wings, traversed, followed by three rows of cells, subtriangular space 

 consisting of four cells, sectors of the arculus stalked, curved towai'ds the extremities, 

 one cross nervure in the lower basal cell, no supratriangular nervures, all the principal 

 sectors nearly continuous, nodal sector nearly straight at the base, undulating in the 

 middle, space between the nodal and subnodal sectors only bisected towards the hind 

 margin, base of the triangle in a straight line with the upper sector, which is only 

 curved towards the extremity; hind wings with 12-15 antenodal and postnodal 

 nervures, the first three postnodals not continuous, triangle free, followed by three rows 

 of cells (often varied with two rows immediately after the first), no supratriangular 

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

 anal appendages moderate, a little shorter than the eighth segment, the lower appendage 

 nearly as long as the others ; appendages of the second segment not prominent. 



Type Libellula ferruginea, Fabr. 



Genus 39. Leptetrum. 

 Newm. Ent. Mag. i. p. 511, note (1833). 



Libellula, Hagen, Neur. N. Amer. p. 151 (1861); Brauer, Verh. zool.-bot. Ges. Wien, xviii. 

 pp. 366, 730 (1868) . 



Frontal tubercle broad, truncated, or notched in the middle ; eyes contiguous ; 

 abdomen rather stout at the base, but not inflated, and gradually tapering, rarely 

 as long as the hind wings, and often much shorter, segments 2 and 3 carinated, 8th 

 segment slightly perfoliate in the female : wings moderately long and broad, ptero- 



