THE SUBFAMILY LIBELLULIN^. 343 



Teteathemis tristrigata. 



Long. Corp. 25 millim. ; exp. al. 46 millim. ; long. pter. 2J millim. 



Female. — Black; head with the frontal tubercle and front green; upper edge of 

 the nasus black, a yellow band covering the lower part and the rhinarium ; lower 

 mouth-parts dark reddish brown ; sides of the labium yellow ; back of the head black, 

 with a transverse yellow spot above the neck. Thorax, legs, and abdomen coloured 

 nearly as in T. hyalina ; but the yellow at the base of the femora is less extended, the 

 slender bristles on the tibiae are much longer, and there is a broad belt, interrupted 

 beneath, on the base of the seventh segment of the abdomen. Wings iridescent 

 yellowish hyaline, the shade strongest between the nodus and the tips ; pterostigma 

 rather large, dark brown ; all the wings with three cross nervures in the lower basal 

 cell ; fore wings with 9 antenodal and 6 postnodal nervures ; hind wings with 7-8 

 antenodals and 6 postnodals, the first or first and second postnodals on all the wings 

 not continuous. 



Hab. Gilolo. 



Tetrathemis flavescexs. (Plate Lll. fig. 4.) 



Long. Corp. 22-24 millim. ; exp. al. 34-38 millim. ; long. pter. 2 millim. 



Male. — Head with the front and frontal tubercle steel-blue; face testaceous; the 

 labrum, mandibles, suture of the labium, and back of the head black. Thorax brassy 

 green above collar, two crescents before the wings and the sides ochreous-red, a broad 

 brassy-green stripe descending just before the first pair of wings nearly to the legs, and 

 on the suture at the base of the hind wings another stripe (shining black) descending, 

 meeting below behind the legs. Abdomen with the second segment inflated, black, the 

 sides of the first two segments, the base of the second above, and two smaller spots on 

 the sides of the third reddish. Legs black; coxae and under surface of the front 

 femora ochreous or reddish. Anal appendages short, about as long as the ninth 

 segment, the upper ones truncated, not longer than the lower, those of the second 

 segment not very prominent. Wings hyaline ; fore wings tinged with yellow to beyond 

 the nodus, and hind wings to the pterostigma, which is blackish brown, between black 

 nervures ; fore wings with two, hind wings with four cross nervures in the lower basal 

 cell ; fore wings with 7 antenodal and 5-6 postnodal nervures, the first postnodal not 

 continuous; hind wings with 6 antenodal and 5-6 postnodal nervures, the first post- 

 nodal not continuous. 



Hab. iSarawak. 



NaNNOTHEMIS SYLVIA. 



Long. corp. 19 millim. ; exp. al. 36 millim. ; long. pter. 1^ millim. 

 Female. — Eeddish brown ; face yellow, the frontal tubercle and upper part of the 

 front blue ; back of the head black, with two yellow dots behind the occipital triangle. 



