NO. 1389. DRAG ONFLIES OF BURMA AND SIAM— WILLIAMSON. 169 



gg. Third imtenodal over arcnliiy;" Mj-^ and M^ separate at their origin; 

 quadrangle uniform in width. 

 h. Venation simple; secondary sectors reduced in number and length, 

 the longest on either side of Mj^ not rising before the inner side 



of the stigma; quadrangle with 1 cross vein LiheUago 



hh. Venation more complex, the longest secondary sector on anterior 

 side, and usually on posterior side of ]Mi^ rising before the 

 inner side of the stigma; more than one cross vein in the quad- 

 rangle Rhinon/plKi 



ee. Antenodals uniform and undifferentiated (usually more than 20), those 

 of first series largely coinciding with those of second series; M3 continu- 

 ing the direction of Mj-j; wings slightly or not at all petioled; sul> 

 quadrangle straight or slightly bent at the arculus. 

 /. Subquadrangle slightly bent at arculus; basal space at least 1^ times as 

 long as quadrangle; quadrangle with less than 4 cross veins. 

 g. Cuj^ not present; nodus before middle of wing; wings petiole<l for a 

 short distance; postnodals more numerous than antenodals. 

 h. Cross veins reduced, quadrangle and basal radial space free, and 

 subquadrangle with a single cross vein; basal space more than 

 twice as long as quadrangle. 



i. Basal radial space closed Bnyadera 



it. Basal radial space j^artly closed AimopUura 



hh. Quadrangle and basal radial space crossed and subquadrangle with 

 2 or more cross veins; basal space about twice as long as the 



quadrangle Enphnxi 



gg. Cuja present; nodus at middle of wing; wings not petioled; anteno- 

 dals more numerous than postnodals Dgsphsea 



ff. Subquadrangle straight; basal space shorter than or only very slightly 

 longer than quadrangle; basal radial space with cross veins; quad- 

 rangle with 4 or more cross veins. 

 g. Arculus not angled, oblique; M^-g and M^ arising from a single point 

 near posterior end of arculus; quadrangle widest at its distal end; 

 Cuj curved strongly posteriorly, Cu.^., wanting; M,, M^, Cuj, and 

 Cu2 forked; basal space free; basal radial space closed; stigma want- 

 ing Vestalin. 



gg. Arculus distinctly angled; M1-3 and 'Sl^ separate at their origin; 

 Cu^-i present. 

 h. Basal space free; stigma present. 



i. Basal space and quadrangle about e(ju:d in length, the quadrangle 



usually with 4 or 5 cross veins Mncm 



ii. Quadrangle narrow, about li times as long as basal space, with 



10 or more cross veins Psolodesmvs 



lih. Basal space crossed. 



i. True stigma present ; radial sector in hind wing not strongly waved. 

 j. Neuration complex; anal area wide, and the hind margin of 

 the wing along this area broadly convex; in the hind wing 

 the area between Cu, and Cu, at their origin is reticulate. 



Archineura (from Kirby's figure) ^ 



« The middle one of the 3 antenodals in Rhinocypha and Libellago is not ]>resent 

 in the wing of Micronieruit, and is not coinciding in the first and second series, unless 

 accidentally. 



^McLachlan has described both sexes of A rchineura incur nata from western China, 

 and he questions the correctness of Mr. Kirl)y's type locality, Fuchau, "although it 

 may have been brought to that port from the interior." 



