746 ON SOME REMARKABLE AUSTRALIAN CORDULIIN.E, 



medially, steely black, with a pair of large round yellow spots 

 above, separated by a broad black band in the median depression; 

 postclypeus overlapping anteclypeus at sides and fringed with 

 stiff brown hairs; anteclypeus jet black; labrum jet black with 

 an irregular yellow basal band widest in the middle, bordering 

 the anteclypeus; labium buge, yellow, with a very large central 

 semicircular area of dull blackish; genai small, yellow. Thorax: 

 prothorax small, hairy, brown. Meso- and melathorax metallic 

 steely black, with long brown hairs above, a broad straight 

 humeral yellow band on each side, and lower down another broad 

 lateral yellow band, crossing notum between wing-joins. Legs 

 long and thick, black; tibiae carrying both long and short bristles. 

 Abdomen: 1-2 swollen, 3 pinched, 4-6 gradually widening, 

 7-10 nearly as wide as 2. Colour black, beautifully marked 

 with yellow as follows : 1, black; 2, basal four-sevenths yellow, 

 rest black, the two colours meeting in a very irregular line, 

 spurs very small, pointed backwards, yellow; 3, basal half yellow 

 except a tine transverse basal black band enlarged dorsally into 

 a triangular black patch, and prolonged along dorsum into a fine 

 black line, anal half black; 4, black, with two large conjoined 

 yellow spots taking up the second quarter of the segment, 

 rounded in front but cut off square behind; 5-6 black, with the 

 same spots smaller, flatter, and separated by a narrow black 

 dorsal band; 7, basal three-fifths yellow crossed by a transverse 

 black line about 1 mm. long on each side, in the supplementary 

 carina, rest black; 8, basal two-fifths yellow with two slanting 

 brown lines in the carina, rest black, the yellow shading insensibly 

 into the black; 9-10 black, a small yellow spot at base of 9, 

 hidden away under the projecting anal end of 8:9 also projecting 

 similarly over 10; 10 with a large vertical black spike 1mm. high. 

 Appendages: superior rather short, scarcely 3mm., wide 

 apart, thick, wavy, pointed, black, some hairs on inner margin. 

 Inferior large, nearly 3 mm. long, very thick, much upcurved, 

 very hollow above, black with a very dark brown centre. (See 

 Plate xxi., figs.9-10). 



