DRAGONFLIES FROM THE LAO COUNTRY. 163 



Wings hyaline, the extreme apical margin a little enfumed, the 

 bases satfronated deeply in the forewing for about halfway to the 

 1st antenodal nervure, and in the hindwing to the 1st antenodal 

 nervure and line of midrib of loop, extending back nearly to the 

 anal angle. 



Stigma dark reddish brown, over about 2 cells, equal in both 

 wings, 3 mm ; membrane dark grey ; arc between the 2nd and 3rd 

 antenodal nervures ; trigone in the hindwing a little proximal to the 

 arc ; both trigones traversed once ; costal side of trigone in forewing 

 shorter than half the proximal ; subtrigone 3 cells ; discoidal field 

 with 3 rows of cells as far as the node, widely dilate:! at the termen ; 

 Gui strongly convex ; 1 cubital nervure in the forewing, 2 in the 

 hind ; all hypertrigones except that of the right hindwing traversed 

 once ; 2 rows of cells between Rs and Rspl ; no supplements to the 

 bridge ; sectors of arc shortly fused in the forewing, a longer fusion 

 in the hindwing; 15 antenodal nervures ki the forewing, 10 post- 

 nodals ; loop well developed, long and narrow, extending 3 cells 

 beyond the outer angle of trigone. 



CrocortJietrum smithi resembles a Crocothemis superficially, 

 but the large size of the posterior lobe of the prothorax and the 

 position of the arc place it in very near relation to Orthetrum. The 

 2 cubital nervures in the hindwing will serve to distinguish it at 

 once from any species of the latter genus. (I overlooked it at first 

 examination, having mistaken it for Crocothemis servilia which it 

 much resembles). 



Type specimen deposited in the British Museum. 

 5. Palpopleura sexmaculata Fabr. 



2 females from Na Kram. These do not differ from type. 



6. Diplacodes trivialis Ramb. 



3 males and 2 females from Na Kram. 2 females from Nong 

 Nam Pi and Ban Siew respectively. 



7. Neurothemis tullia tullia Drury. 

 A single female from Na Kram. 



8. Neurothemis fulvia Drury. 

 1 pair from Na Kram, 1 male from Ban Siew, and 1 male 

 from Ban Nua. 



VOL. IV, NO. 3, 1921. v 



