BY R. J. TILLYARD. 



303 



tip somewhat clubbed, that of the female stouter and practically 

 cylindrical throughout. The new form of the female is interme- 

 diate in shape between the two, the abdomen being thicker than 

 in the male, but with the tip distinctly enlarged. In colouring it 

 almost exactly resembles the male, and bears not the slightest 

 resemblance to the typical female. Like the latter, however, it 

 possesses the pale pterostigma on the forewings, whereas in the 

 male this is black. 



The remarkable difference between the two forms of female is 

 best shown by the tabular description which follows. Forma A 

 denotes the typical female, Forma B the new form : — 



Forma A. 



Wings as in ^ except ptero- 

 stigma of forewings, pale olive- 

 brown. 



H e a d. — Epicranium black, 

 with a transverse band of dull 

 olive in front reaching to the 

 eyes. Eyes black, with a small 

 round olive spot at the back of 

 each. Fost-dypeiis black. Ante- 

 clyj)eus dull olive. Lahrimi 

 black. Labium and lower 

 mouth parts pale yellowish-grey. 



T h o r a x. — Prothorax black, 

 with a narrow olive collar. 

 Thorax black above, a yellowish- 

 brown or olive-brown stripe on 

 each shoulder. Sides greyish; 

 underside pale greyish. 



Legs black. 



Forma B. 

 Wiyigs as in A. 



H e a d. — Epicranium black, 

 with a transverse band of bright 

 bluish-green in front, reaching 

 to the eyes. Eyes black, with 

 a small round spot of brilliant 

 blue at the back of each. Post- 

 clypeus black. Ante-clypeus 

 blue, separated from labrum by 

 a black suture. Labrum light 

 blue. Labium, etc., pale yel- 

 lowish-grey. 



Thorax. — Prothorax bronze- 

 black, with a narrow blue collar. 

 Thorax deep bronze-black above, 

 a narrow stripe of brilliant blue 

 on each shoulder (in some speci- 

 mens this stripe is almost obso- 

 lete). Sides brilliant blue; 

 underside pale greyish. 



Legs black. 



