JOURN. NAT. HIST. SOC SIAM. VOL. IV. PLATE 10. 



Fig. r. Anal appendages of Agriocnemis binocellata. a. From above, b. Semi-profile. 



n 



li 



Fig. 2. Dorsal markings of the first and second abdominal segments of— a. Pseudagrion siamensis 

 b. Pseudagrion williamsoni, c. Pseudagrion laidlawi, d. Pseudagrion bengalense and microcephalum. 



BANGKOK DRAGONFLIES. 



