BY R. J. TILLYARD. 439 



with a large squarish black spot at base. Meso- and meta- 

 thorax olive-brown, with a thick straight dorsal black band, 

 carrying on the central ridge a thin white line, very con- 

 spicuous ; on each side a shorter pale narrow band, edged 

 above with black; sides and underside pale greyish-brown. 

 Legs very short, pale brown. Abdomen long and slender ; 

 1-2 scarcely enlarged at all, 1-7 very narrow, 8-10 slightly 

 enlarged. Colour metallic steely black, crossed at each 

 suture by a pale creamy line, interrupted dorsally by a black 

 line ; sides of 2 pale brown, sometimes also a brownish cloud 

 on dorsal surface of 2 ; underside pale yellowish-brown, with 

 a dark patch at apex of each segment. Appendages: 

 superior 0-5 mm., thick, black, forcipate ; seen from above, 

 the inner margin carries a large serrated shelf beginning 

 about the middle and ending on the turned-in edge of the 

 tip, which is somewhat rounded ; in profile, the underside 

 is hollowed out into an arch, and the end is strongly clubbed. 

 Inferior 0-3 mm., thick, slightly bent, truncate: in profile, 

 the base is thick, the tip narrower but blunt (Plate xlvi., 

 figs. 17, 18). 



9. Total length, 37-5; ahdomen,, 31; hindwing, 22-5 mm. 

 Very similar to male but differing in the following points. 

 Lahrum pale brownish. Abdomen cylindrical, slightly 

 wider than in male, 8-9 slightly enlarged, 10 very small. 

 Underside of 9 pale yellowish ; ovipositor black, with two 

 small diverging filaments. Appendages very short, pointed, 

 black. 



Hah. — Cooktown, N.Q. Very rare; January, 1908. 



Types: 0^9, Coll. Tillyard. 



This retiring and inconspicuous species was discovered by 

 me not far from the summit of Mt. Cook. At the top of a 

 very steep gully, densely clothed in forest-growth, a small 

 stream emerges and falls over a steep ledge of rock. At this 

 point the walls of the gully are closed in, so as to form a 

 ledge about twelve feet high on each side of the waterfall. 



