160 JOURNAL, BOMBAY NATURAL HIST. SOCIETY, VoL XXVI. 



Legs robust ; hind f eraorse with numerous moderately close-set, very 

 short, and near the end, gradually lengthening spiuts with one or two 

 longer spines at the extreme end ; f emorje 2 similar but the spines 

 somewhat less numerous and larger ; tibial spines numerous, moderately 

 slim and loug ; claw-hooks large ; in the female the armature almost 

 identical. 



Abdomen variable in shape, generally robust and depressed. 



Sexual organs of the male : tentaculse small with a regular and reduced 

 outer segment. 



Sexual organs of the female ; border of 8th abdominal segment variable, 

 vulvar scale small and not projecting. 



Wings loug and narrow, in many species partly coloured. Reticulation 

 close ; trigone in the fore.ving generally somewhat distal to the trigone in 

 the hind, its relation to the hypertrigone a right angle or rather more ; 

 sectors of arc in tho forewiug separated or if fused, the fusion very short, 

 in the hiud a shorter fusion generally present ; between the 1st and 2nd 

 antenodal nervures, occasionally at the 2nd or between the 2nd and 3rd ; 

 8th nervure in the hindwiug from the anal angle of the trigone ; antenodal 

 nervures 12-17, the last usually complete; trigone in the hindwiug long 

 and narrow with a concave outer side, at the arc or a little distal or proxi- 

 mal to it; 1 cubital nervure in the forewing, 1 to 2 in the hind; super- 

 numerary nervures to the bridge as a rule present ; all trigones traversed, 

 in the forewing generally several times; hypertrigones traversed or entire 

 (this point very variable) ; sub-trigone m the forewing with b or more cells 

 up to as many as 10 ; 4th nervure with a strong double curve, first a 

 costalwards convexity and then a concavity, the end being slightly bent 

 towards the termen ; at least 2 to 3 rows of cells between 4 and 6, fre- 

 quently 2 rows of cells for a short distance ; 3 rows of cells between 5 and 

 5a ; 8th nervure in the forewing short and strongly bent. The discoidal 

 field at the termen very strongly dilated, beginning with 3 to 6 rows cells; 

 7a well developed : 1 to 2 rows of cells between 7 and la ; loop large, ite 

 outer angle a right angle or it may be obtuse and extending 2 to 3 cells 

 beyond the outer angle of the trigone. 



Membrane large. Stigma variable, moderately small or very large. 



Key to Species. 



i. The whole body including the abdomen hairy. 



Abdomen in the male red or ochreous, not 



frosted with bine. 

 A black spot in the middle of costa and often 



another difi'uso spot ' ear the stigma. 

 A black marking at the base of the hindwing 



reticulated with yellow. 

 Membrane white. . .. .. . . L, quadrimaovlata 



ii. The abdomen naked. 



Abdomen in the male dark brown, frosted 



over with blue. 

 No black spots on the costa or near stigma. 

 A rusty spot at the base of the hindwing. 

 Membrane black . . . . . , . . . . L. fulva, 



11, Libellula quadrimaculata, Linn^. 



Leptetrum tftiadrimaculata, Kirby. 

 Libellula quadripunctata, Fabricius. 

 Libellula maculata,S.&mB . 



