No. 1571. DRAGONFLIES OF BURMA AND 8IAM— WILLIAMSON. 



297 



having a yellow spot on the vertex between the eyes. In torquatus antl 

 hetfTostylus the black on the sides of the thorax forms a distinct Y. C. 

 loeterostylus, of which the male has been described, has the stigma yellow, 

 with a central brown spot; torquatus is known only from the female. 



Fig. 23.— Wings of female CYCL;)GGMi'Hr.s iietekostylus. De Selys' collection. 



In vesiculos'us and ypsilon the black on the sides of the thorax does 

 not form a distinct Y. f\ iH'sicidosus has the abdomen 25 mm., hind 

 wing 23 mm., the female is not known; ypsilon has the alxlomen 32 

 mm., hind wing 29 mm. Only in the case of ypsilon are botli sexes 



Fig. 24.— Wings of ANisoGOMPiirs occipitalis. De Selys' collection. 



known; lifterostylus and vfsiculosus are known only from males, and 

 the single male of vesiculosus has the last 5 abdominal segments 

 wanting; minuscvlus , verticalis, and torquatus are known from 

 females only. The abdominal appendages of the males in the two 



