BY R. J. TILLYARD. 233 



the same creek as the small and very dark M. guttata melanosoma, 

 n.subsp., the former being at its southernmost, and the latter at 

 its northernmost limit, which coincide. 



4. AUSTROGOMPHUS ANGELI, n.Sp. 



(J. Total length 39, abdomen 29, forewing 22, hindwing 21 mm. 



Wings saffroned at base for 1*2 mm. (more in immature 

 specimens); pterostigma 2*2 mm , black with a brown centre. 

 Nodal Indicator 12, 7-8[; membranule very small, grey. Head: 

 occiput black, 9, 8 with a large semioval yellow patch ; 

 vertex black, with a yellow triangular spot; a broad black band 

 along base of front, and a blackish line (sometimes absent) in 

 suture between front and clypeus; all other parts yellow or green- 

 ish-yellow (the green supervening with age), and fairly covered 

 with blackish hairs, except labium, which is dirty brownish-yellow, 

 with a few whitish hairs. Thorax : proihorax black, a wide 

 yellow collar in front; a pair of small round geminate spots on 

 dorsum, and a lateral spot on each side. Meso- and metathorax 

 black above, with a pair of very distinct and complete yellow 

 " seven-marks," followed by a narrow humeral yellow band much 

 pinched just before its backward end, where each enlarges 

 into a conspicuous yellow spot situated just above the interalar 

 ridge. On the sides, a black band follows the humeral yellow 

 band, and there are two complete lateral black bands; the middle 

 one of these three bands is somewhat irregular in shape, the 

 lower one straight; between them lie two broader areas of yellow; 

 also the large area below the lowest band is yellow (see diagram 

 of thoracic colouring, Plate xv., fig. 7). Underside dull yellowish. 

 Notum black, with conspicuous yellow scuta and scutella, and 

 yellow spots on wing-joins. Legs short, black, coxae and under- 

 side of profemora yellow. Abdomen: 1-2 swollen, 3-6 very 

 narrow, 7-10 clubbed. Colour black, marked with yellow as 

 follows : a cross-bar on 1, and a dorsal stripe on 2, form a large 

 and conspicuous T-mark, from the head of which projects a short 

 yellow line; sides of 1-2, auricles, and genitalia largely yellow; 

 lateral view of segment 2 as shown in fig. 5 of Plate xv.; 3-6 with 

 a fine dorsal line, slightly swollen basally; 3 with two large 



