INDIAN DRAGONFLIES. 147 



Lathrecista, Kirby. 



Libellula, Fabric! us. 



Ortheti'um, Kirby. 



Libellula, Brauer. 



Agrionoptera, Selys. 



Head relatively large, globular; eyes broadly contiguous: forehead 

 projecting ; auterior border in the male poorly marked, rounded in 

 the female ; sutures flush; vesicle notched or bearing two small tubercles 

 at its summit; a ruff formed of small tufts of short hairs lining the upper 

 margin of the occipital cavity and overhanging and partially concealing the 

 prothorax. 



Prothorax small; the lobe rounded, not projecting, naked. 



Thorax robust, coated with hair in front on the dorsum, naked at tht; 

 sides. 



Legs ; hind femorjs of the male bearing about 16 short, broad, uniform 

 spines; tibial spines long ; claw-hooks ordinary. Hind femoriB of the female 

 with somewhat I'Miger spines and less numerous than in the male. Wing long 

 and narrow ; reticulation close ; node in the forewing relatively near the 

 base, a little proximal to the middle of the wing ; tiigone in the fore- 

 wing in line with that of the hind ; sectors of arc in forewing rather shortly 

 fused, in the hind a much longer fusion ; arc between the 2nd and 3rd 

 antenodal nervures ; 8th nervure in the hindwing a(. the anal angle of the 

 trigone; 18^ to 17-| antenodal nervun-s; trigone in tlie hindwing at the- 

 arc or occasionally a little distal to it ; trigone in the forewing at more than 

 a right angle in relation to the hypertrigone, traversed, that of the hind 

 entire ; all hypertrigones entire ; sub-trigono of the forewing formed of 3 cells 

 or more rarely of 4 ; only 1 cubital nervurf^ to all wings and no supplementary 

 nervures to the Bridge ; 4th nervure distinctly double-curved ; 1 row of cells 

 between 5 and ha, occasionally a few doubled cells ; 3 rows of cells in the 

 discoidal field ; the latter only a Utile dilated at the termen ; 8th nervure 

 ^itly convex ; anal field in forewing with '2 rows of cells, in the hind modera- 

 tely broad ; loop long, the apex very stunted, split cells at the outer 

 angle oidy : the outer angle nearly equal to a right angle, extending 2 to 3 

 cells beyond the apex of trigone. 



Stigma large. Membrane small. 



Abdomen : slim, keeled, triangular in cross section, parallel-sided or in the 

 male, segments 3 to 5 a little constricted. 



Anal appendages cylindrical, a little bulbous near the extremities which 

 are pointed and curving, black. The inferior appendage curving up to 

 meet the superior The superior are rather longer than the 9tf abdominal 

 segment. Those of the female very small, widely remote, cylindrical, black. 



Sexual organs : (6'ee under species). 



10. Lathrecista asiatica asiatica, R'>«. 



L'tthrecista pectoralis, Kirby, 



Li'ieliula asiatica, Fabricius. 



Orthetruiii asiatica, Kirby, 



Libellula pectoralis, Brauer. 



Ayi'lonojitera simulni'is, Selys. 



Lathrecista simularis, SelyF, 



Lathrecista terminalis, Ki.by, 



Lathrecista pectoralis, var. iuterposita, Fcirster, 



