THE SUBFAMILY LIBELLULLST^. 279 



nervure in the lower basal cell, subtriangular space consisting of three cells, sectors of 

 the arculus rising from a short stalk, the nodal sector slightly waved towards the base, 

 the subnodal nearly straight, the intermediate cells only bisected on the hind margin ; 

 hind wings broader than the fore wings, with 5 antenodal and 6-7 postnodal nervures, 

 the first two or three subnodals not continuous, triangle free, its base corresponding to 

 the arculus, followed by two rows of cells, increasing, no supratriangular nervures, one 

 cross nervure in the lower basal cell, sectors of triangle united at base : anal appendages 

 of the male slender, as long as the last two segments, the lower appendage somewhat 

 shorter than the others ; appendages of the second segment not very conspicuous. 

 Type Lilelhda contaminata, Fabr. 



Genus 25. Crocothemis. 

 Brauer, Verb, zool.-bot. Ges. Wien, xviii. pp. 367, 736 (1868). 



Frontal tubercle slightly indented above; eyes contiguous in the middle; abdomen 

 stout, thickest at the base, and gradually tapering, about as long as the hind wings, 

 segments 2 and 3 carinated, segment 8 not perfoliate in female : wings rather short, 

 pterostigma moderate; fore wings with 9-13 antenodal nervures, the last only excep- 

 tionally continuous, and 7-11 postnodals, the first two or three not continuous, cells of 

 the postnodal area simple, triangle moderately long, traversed by one nervure (very 

 rarely free, or traversed by two nervures), the base oblique, followed by three rows of 

 cells, increasing, no supratriangular nervures, one cross nervure in the lower basal cell, 

 subtriangular space consisting of three cells, sectors of the arculus stalked, nodal sector 

 waved at the base, and hardly at all in the middle, nodal and subnodal nervures only 

 slightly curved, the intermediate cells bisected towards the hind margin ; hind wings 

 broader than the fore wings, with 8-9 antenodal and 8-11 postnodal nervures, the first 

 two or three postnodals not continuous, triangle free (very rarely traversed) and followed 

 by two or three rows of cells, increasing, no supratriangular nervures, one cross nervure 

 in the lower basal cell, sectors of the triangle more or less separated at base: anal 

 appendages of the male hardly longer than the eighth segment, the lower appendage 

 distinctly shorter than the others; appendages of the second segment conspicuous. 



Type Libellula erytliraa, Brulle. 



Genus 26. Microthemis. 

 (Neuration, Plate LVI. fig. 1.) 

 Brauer, Verh. zool.-bot. Ges. Wien, sviii. pp. 367, 724 (1868). 



Frontal tubercle rounded ; eyes contiguous in the middle ; abdomen as long as the 

 wings (which are rather short), broad, depressed, tapering a little towards the tip, 

 segments 2 and 3 carinated, pterostigma short : fore wings with 7 antenodal and 6-7 

 postnodal nervures, the first two postnodals not continuous, cells of the postnodal area 



