238 



MAJOR FRASER CN DRAGONPLIES FROM BANGKOK. 



P. trotteri. 



Abdomen SI '5 mm. 

 Hindwing 20'5 mm. 



Postnodiil nervures in forewing 12/lo., 



hindwing 11. 

 10th abdominal segment almost entirely 



blue. 

 Markings of head pale creamy. 

 Markings of thorax pale blue. 

 Legs white marked with black. 



P. arachnoides. 



Abdomen 39 mm. 

 Hindwing 24 mm. 

 Postnodal nervures in forewing 14/16., 



hindwing 13. 

 10th abdominal segment almost entirely 



black. 

 Markings of head deep ochrcous. 

 Markings of thorax deep ochreous 

 Legs uniform bright ochrcous. 



The curious and well-defined markings on the head and 

 upper part of the humeral, black band, are exactly the same shape 

 in the two species, as also are the form and colouring of the anal 

 appendages. 



26. Lestes sp. 



Female only. Closely resembles L. umbrina Selys. A male 

 of this form is necessary to settle the identification. 



JOUKN. NAT. HIST. SOC. SIAM. 



