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PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXIII. 



ond; stigma without brace vein (in cochinchinensis, 

 the only species of the genus I have studied). 



Heterogomphus 

 kk. Triangle in hind wing distinctly separated from M4 by a short 

 stalk (the extreme development from the condition found 

 in Agriogomflms and Neogo7nphus , for examples); M4 and 

 Cu, in front wing divergent, 4 cells between at level of 

 nodus; 3 rows of cells between Mj and Mj^ at level of distal 

 end of stigma in front wing; 2 rows of cells between Mj and 

 M2 in front wing appearing first nearer stigma than nodus; 

 arculus in front wing distal to second antenodal; anal area 

 in front wing with 2 rows of cells proximal to the level of 

 the triangle, followed distally by a maximum width of 4 or 

 5 cells; A, in hind wing arising near the inner angle of the 

 subtriangle; 5 rows of postanal cells; 3 or 4 cross veins be- 

 tween Mi_3 and M4in front wing; stigma with brace vein. 



Merogomphus 



Subfainily OORr>XJIL.E&,A-STE;RI]Sr^E;. 



Genera ALLOGASTER De Selys, ANOTOGASTER De Selys 

 anci THECAGASTER De Selys. 



No species of the subfamily Cordulegasterinse have been reported 

 for Burma or Siam and none is represented in the collections accessible 

 to me, though representatives of three genera are known from India. 



Fig. 4.— Wings of male Anotogaster sieboldii from Japan. 



These genera are separated by De Selys as follows: Allogaster is 

 distinguished by the greatly developed frons, almost as wide as the 

 eyes, with the crest as elevated as the base of the occiput. Only 

 one species, latifrons I)e Selys, from Bengal, is Ioiomti. In Anoto- 

 gaster the stigma is long, the head globose; and in Tliecagaster the 

 stigma is short, the head transverse. Four species of Anotogaster 

 are kno\Mi, occurrmg in Nepal and North India, through Tibet 

 and China to Japan. A. lasalis De Selys, occurring in North India, 



