BY R. J. TILLYARD. 395 



curving round to join the subhumeral black rays of which there 

 is one on each side, reaching to the fore wing-joins, and below it 

 a parallel lateral black ray reaching to the hind wing-join; all the 

 sutures marked by thin black lines. Wing-joins black, spotted 

 with blue; scuta and scutella blue. Underside dirty grey or 

 brown, edged with black. Legs black, powdered with grey. 

 Abdomen cylindrical, 1-3 slightly swollen. Colour : 1, blue, 

 with black suture; 2, blue, suture broadly black, a black semi- 

 elliptical spot two-thirds of the way from the base and connected 

 to it by a thin black line along the dorsal ridge; sides of 2 black; 

 3, basal two-thirds blue, rest black, a thin black line along the 

 dorsal ridge, sides and underpart black; 4-7, jet black; 8, blue; 

 9, blue between broadly black sutures, the black on the basal 

 suture sharply pointed inwards along the dorsal ridge; 10, black 

 with a pair of oval blue spots; 9, swollen below into a small 

 pointed tubercle. Underside black, powdered with grey around 

 the genital appendages of segment 2, which are large and black. 

 Appendages: Sujoerior forcipate, nearly 2 mm., jet black, 

 tips blunt, slightly clubbed and downy, nearly touching; seen 

 sideways the tips are slightly curved downwards. Inferior (two) 

 about 1 mm., subcylindrical, black, tips blunt, in some specimens 

 divergent, in others close together and parallel. 



9. Total length 44-46 mm.; abdomen 31-33 mm.; wings, fore 

 32-34 mm., hind 31-33 mm. Wings longer and narrower than 

 in (^, generally almost completely suffused with dull brown or 

 yellowish-brown; sometimes, especially in immature specimens, 

 hyaline. Pterostigma 4 mm., brown or dark brown. There are 

 two distinct types of the $ which I shall designate A and B. In 

 A the ground colour of the thorax and abdomen is either dull 

 olive brown, slightly metallic, or else dull smoky black. In B it 

 is bright yellowish-brown. Head: Vertex, A, dark olive brown, 

 B pale brown; a curved black band between the antennae touch- 

 ing the front ocellus; behind this an irregular black band or series 

 of spots reaching from eye to eye and enclosing the two other 

 ocelli. Behind this the occiput is swollen, almost tubercled; 

 colour next the eyes black; a black or dark brown line across the 



