INDIAN DIIACWNFLIES. 621 



Hijlceothemis, Ris. 



Tetrathemis, Karsch. Ent. Nachr., 15, p. 321 (1889). 



Head moderately rounded ; eyes very shortly contiguous ; front rounded 

 without any prominent foreborder ; suture moderately deep ; vesicle 

 large, with a scarcely perceptible notch, the ocelli projecting from its 

 lateral ends, 



Prothorax lobe large, projecting, rounded and notched centrally. 



Thorax narrow. Legs moderately large, robust. Male ; hind femorsB 

 with an external row of numerous, very small, triangular, apicalwards 

 directed spines ; a longer spine at the distal end ; mid femur with similar 

 spines on its basal half, followed by three larger and more widely separated 

 spines. Tibial spines long and slim ; claw-hooks robust, the points not sloping. 



Abdomen slim, cylindrical ; male ; segments 7-9 a little broadened ; 

 female much stouter than the male, laterally compressed, segments 7-10 

 dilated, especially the 8th and 9th whose sides are foliately expanded. 

 Genitals of male ; 2nd abdominal segment large and prominent, tentaculsB 

 foliate. Genitals female; border of 8th segment raised into a foliate 

 projection, its free border arched and deeply notched ; 9th ventral plate 

 keeled. Anal appendages of male as long as 9th segment, cylindrical, 

 pointed, curving strongly ventralwards. The inferior fused, narrow, tri- 

 angular and curving upward to meet the superior. Superior appendages 

 of the female much smaller than those of the male, more remote, cylindrical, 

 about as long as the 10th abdominal segment. 



AVings long and narrow, the hind a little broader than the fore, apices 

 rounded. The node widely distal to the middle of the wing ; trigone in 

 fore-wing in line with that of hind ; arc between the 1st and 2nd antenodal 

 nervures ; sectors of arc fused to a long extent ; 8th nervure in the 

 fore-wing out of the posterior angle of the trigone, in the hind widely sepa- 

 rated ; 14-16 antenodal nervures ; trigone in hind-wing widely distal to the 

 arc, its costal side whole or near its distal end obtusely bent ; 4th nervure 

 flat in its proximal part but rather sharply bent near the termen ; only 1 

 row of cells between 5-.5a ; trigone in the fore-wing very small, the costal 

 side very obtusely bent at its distal third ; subtrigone and trigone in fore- 

 •wing entire ; trigone in hind-wing large, traversed ; all hypertrigones 

 traversed ; 2 cubital nervures in fore and hind-wings ; only 1 row of cells 

 in discoidal field of fore-wing nearly np to termen ; 8th nervure nearly 

 straight ; discoidal field nearly parallel or a little dilated at the end ; loop 

 very indistinct, of only four cells and sharply limited. Stigma medium- 

 sized. Membrane very small. In the female the wings are apt to show 

 considerable differences. The costal side of the trigone in fore-wing is not 

 usually bent and the same side in hind-wing may or may not be bent. The 

 loop is much more developed, there being 6 to 7 cells in its composition. 

 The node is nearer the middle of the wings. 



3. Hylseothemis fruhstorferi, Kirby, Cat. of Neuroptera-Odonata, pp. 44 

 1890. 



Tetrathemis fruhstorferi, Karsch. 



Male, Expanse 60 mm. Length 3S mm. 



Female, Epxanse 6") mm. Length 38 mm. 



Male, head : labium bright yellow, the inner border and the middle 

 lobe black ; epistome and lower part of face bright yellow ; vesicle and 

 forehead a brilliant metallic green or bluish-green ; occiput black with 

 a spot of bright yellow posteriorly ; eyes bottle green above, yellowish 

 green beneath. 



Prothorax : lobe of large size, pale blue, notched in the middle and fur- 

 nished with a ruff of long hairs. Front part of prothorax with a pale blue 

 collar, the remainder black with an angular blue spot in middorsum. 



