740 JOURNAL, BOMB AY NATURAL RIST. SOCIETY, \ol. XXVI. 



GeniTS — Zygonyx, Selys. 



Fig. 45. Wings of Zygonyx iris showing neuration. 



Zygonyx, Selys, 1867, 1871, Brauer, 1868, Karsch, 1890, Kirby, 1900. 

 Zygonidia, Kirby, 1900 and 1901. 



Neurocena, Kirby, Ann. Mag. Nat. Hist., 1900, Id. 1905. 

 Head large and globular ; eyes moderately contiguous ; forehead pro- 

 minent, rounded ; vesicle high and broad, notched at its summit. 

 Prothorax : lobe small, flatly arched, not projecting. 



Thorax robust. Legs long and slim ; hind femora with a row of stout, 

 small, triangular spines and 3 or 4 longer ones at the distal end : mid- 

 femora furnished with a dense mass of long coarse hairs. The hind femora 

 of female with a row of gradually lengthening spines. Tibial spines very 

 long and numerous. Claw hooks very robust, more so than the claws, which 

 are exceptionally long. 



Abdomen robust, the base somewhat dilated, the 3rd and 4th segments 

 distinctly constricted, especially in the male and then parallel-sided as 

 far as the end. Abdomen of female more robust than that of male and the 

 sides of the 9th segment dilated. 



Wings long and narrow, very robust, the node of forewing being placed 

 far distal to the middle point of wing ; reticulation rather open ; trigone 

 of forewing about Z cells distal to the line of the trigone in the hind ; 

 sectors of arc fused for a short distance in the forewing ; for a longer 

 distance in the hind : arc usually between the 1st and 2nd antenodal 

 nervures ; 8th nervure in the hind wing at the anal angle of the trigone 

 or a little separated : .antenodal nervures vejy variable, 12i to 16, the 

 end one complete or incomplete ; base of trigone in the hindwing usually 

 a little proximal to the arc; 1, 2 or 3 cubital nervures in the forewing, 

 1 or 2 in the hind ; no supplementary nervures to the bridge (I possess 

 one specimen which has an accessory nervure in one of the forewings) ; rela- 

 tion of trigone in the forewing to the hypertrigone rather more than a 

 right angle, usually traversed but in one species free: trigone in the 



hindwing traversed or entire ; subtrigone in 



the forewing with 1 to 4 



cells ; 4th uervure variable, with a single flat curve or markedly undulated ; 

 1 or 2 rows of cells between 5 and 5a, or a few divided cells ; the discoidal 

 field usually with 3 rows of cells, dilated at the tftrmen ; anal field broad, the 



