THE SUBFAMILY LIBELLULINjE. 299 



suddenly curved at the extremities, nodal sector distinctly waved in the middle, sub- 

 nodal much less so, the intermediate cells bisected towards the hind margin ; hind 

 wings broader than the fore wings, with 10-13 antenodal nervures (the last excep- 

 tionally discontinuous) and 9-11 postnodal nervures, the first three not continuous, 

 triangle free, its base on a level with the arculus, followed by two or three rows of 

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

 spines of the legs short and slender, sectors of the triangle united at base: anal 

 appendages of the male rather stout, as long as the eighth segment, the lower 

 appendage only slightly shorter than the others ; appendages of the second segment 

 not conspicuous. 



Type Libellula frontalis, Burin. 



Genus 60. Rhodopygia, g. n. 

 (Plate III. fig. 10.) 



Characters of Dythemis and Scapanea, but more robust and with more numerous 

 cross nervures. Fore wings with 18-20 antenodal and 12-14 postnodal nervures, the 

 last antenodal and the first two or three postnodals not continuous, nodal sector hardly 

 undulated beyond the middle ; hind wings with 12-15 antenodals and 14-15 postnodals, 

 the first three postnodals not continuous ; abdomen as long as the hind wings, triquetral, 

 rather stout, slightly gibbous at the base, dilated laterally, but compressed, so that the 

 dilatation is not visible from above, the segments very gradually widening as far as the 

 seventh, and slightly depressed at the widest part. 



Type Libellula cardinalis, Erichs. 



Genus 61. Pseudomacromia, g. n. 

 (Plate LII. fig. 7.) 



Allied to Lepthemis, but with the abdomen stouter and very slightly expanded at 

 the base, and the wings broader, giving the insect at first sight a strong resemblance to 

 Macromia or Anax. Eyes large, connected by a moderate space; segments 2 and 3 of 

 the abdomen carinated, segment 4 slightly ; legs stout, of moderate length, and with 

 slender and moderately long bristles, femora distinctly serrated beneath : fore wings 

 with 11—12 antenodal and 6-8 postnodal nervures, the last antenodal and the first 1-3 

 postnodals not continuous, nodal sector much waved in the middle, sectors of the arculus 

 rising at two thirds of its length in a long stalk which arches upwards, and rather 

 suddenly curved at the extremities, triangle moderate, traversed, followed by three rows 

 of cells, its upper sector nearly straight, subtriangular space consisting of three or four 

 cells, no supratriangular cells, and only the usual single cross nervure in the long and 

 narrow basal cell, pterostigma moderate, triangle of the hind wings generally open, its 

 sectors united at their origin. 



Type Pseudomacromia torrida, sp. n. 



2x2 



