THE SUBFAMILY LLBELLULLN^E. 291 



lower appendage rather broad, as long as the others; appendages of the second 

 segment not conspicuous. 



Type Nesocria woodfordi. 



Intermediate between Agrionoptera and Protortkemis, but not agreeing very well 

 with either. 



Genus 46. Lathkecista, g. n. 



Frontal tubercle concave, but hardly bifid ; eyes contiguous ; abdomen rather slender, 

 of nearly uniform thickness, about as long as the hind wings, the base not dilated, 

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

 and narrow, the hind wings not much broader than the fore wings, pterostigma long 

 and rather broad; fore wings with 14-20 antenodal nervures (10-11 in L.{%) d/fficilis, 

 Selys), the last not continuous, and 11-13 potsnodals, the first three not continuous, 

 cells of the postnodal and costal areas simple or bisected at the tip, beyond the 

 pterostigma triangle moderate, on a level with that of the hind wings, traversed, 

 followed by three rows of cells, increasing (free, followed by two rows in L.{X) difficilis), 

 subtriangular space consisting of 3-4 cells, sectors of the arculus stalked, strongly 

 curved at the extremities, no supratriangular nervures, one cross nervure in the lower 

 basal cell, nodal and subnodal sectors undulating in the middle, and curved at the 

 extremity, the intermediate cells bisected towards the hind margin ; hind wings with 

 11-13 antenodal and postnodal nervures, the first three postnodals not continuous, 

 triangle free, followed by two rows of cells, its base corresponding with the arculus or 

 placed just within it ; no supratriangular nervures, one cross nervure in the lower basal 

 cell, sectors of the triangle united at base: anal appendages as long as the eighth 

 segment, the lower one hardly shorter than the others, those of the second segment 

 not conspicuous. 



Type Libellula pectoralis, Brauer. 



Genus 47. Nesoxenia, g. n. 

 (Plate LILT. fig. 8.) 

 Frontal tubercle rounded ; eyes large, contiguous in front ; abdomen slender, as long- 

 as the hind wings, slightly but abruptly dilated at the base, as in Micrathyria, and 

 thickened at the sutures, segments 2 and 3 carinated, 4 imperfectly : wings long and 

 narrow, pterostigma broad, not very long; fore wings with 14-15 antenodal and 11-15 

 postnodal nervures, the last two or three postnodals not continuous, cells of the lower 

 postnodal area simple, triangle small, free or traversed, at or beyond the level of 

 that of the hind wings, and followed by two rows of cells, only increasing at about 

 three fourths of the distance to the hind margin, subtriangular space consisting of two 

 cells, being divided by a curved nervure, sectors of the arculus with a very long stalk 

 and only slightly curved at the extremities, lower basal cell with two to four cross 



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