734 THE DRAGONFLIES OP SOUTH WESTERN AUSTRALIA, 



basal spot or mark on each side of the dorsal ridge (on segment 3 

 these run down and spread over the underside); four small spots 

 close together near the centre of the segment, formed by the 

 supplementary carina cutting a pair of central spots transversely; 

 a pair of very small anal spots, very often obsolete, on 5-7; on 

 each side two small irregular spots, one basal and one anal, 

 absent in 6-7; 8, a fine basal line in the suture on each side, a 

 pair of dorsal spots one-third of the segment from the base; 

 sometimes a dorsal anal spot; 9, a touch of pale brown on dorsal 

 ridge, sometimes an anal dorsal spot; a lateral oval spot on each 

 side; 10, sometimes a small spot at the base of each superior 

 appendage ; no dorsal spine or tubercle. Appendages: 

 Superior wide apart, 4 mm., black, narrow sublanceolate, tips 

 rounded; a tiny spine above the base of each, then a short stalk 

 for about 1 mm., carrying underneath an obtuse spine, rest of 

 appendages flat, with soft hairs on the inner margin. Viewed 

 laterally, the inner margin is seen to bend down, forming an 

 obtuse-angled projection underneath. Inferior short, l'8mm., 

 thick, black, somewhat truncated, with the tip 0-5 mm. broad 

 and slightly bifid; hollow above, slightly upcurved at tip, very 

 rounded and convex beneath. 



9. DiflPers from male as follows : — Pterostigma brownish. 

 Dorsal spots of thorax exceedingly small. Abdomen much thicker 

 than in male, 1-2 swollen, 7-10 slightly enlarged. General scheme 

 of markings similar to male, but some of the dorsal spots on 2 

 either very indistinct or entirely absent; basal marks of 3-7 very 

 small, and anal spots generally quite absent; lateral spots much 

 larger than in male, the basal ones half cut into on 3-5 by a short 

 black hook or intrusion; 8, rather short, black; on each side a 

 tiny basal spot low down, also an anal spot; ovipositor black, 

 large, carrying two fine filaments nearly 2 mm long, with their 

 basal joints thickened; 9, black, with a pair of anal spots; 10, 

 black, carrying beneath the appendages a rounded black hairy 

 tubercle, and beneath this again a small ridge armed with four 

 or five small teeth. Appendages very short, slightly separated, 

 0-8 mm., very flat, rather w^ide at bases, black, tips blunt and 

 rounded. 



