552 DESCRIPTIONS OF NEW SPECIES OF AUSTROGOMPHUS, 



This species probably has a restricted range along the coastal 

 ranges behind Cairns. A few specimens were seen by me along 

 the river below the ranges, but it is by no means a common 

 species in any locality. 



No specimen is known in any European collection which can 

 be referred to this species. The remarkable appendages mark it 

 out as very distinct from other species of Austrogomphus. 



3. AuSTROGOMPHUS PRASINUS, n.sp. 



(Plate xxxiv., fig. 3). 



$. Total length 4:3mm.; abdomen 32 mm.; wings, fore 28 mm., 

 hind 26mm. 



Wings. — Neuration black, a faint touch of saffroning at 

 bases. Memhranule nil. Pterostigma 3 mm. long, covering 3-4 

 cellules, fairly broad, black. Nodal Indicator 14-17 9-11 



I 10-11 11 



Head. — Occipital ridge 1 mm., black above, greenish behind. 

 Vertex black. Ocelli black, the median one set below the other 

 two. Antennce thin, black, basal joint short and thick. Eyes 

 very dark brown. Front yellowish-green, bordered above and 

 below with black. Clypeus: postclypeus black with a yellowish- 

 green spot low down on either side near anteclypeus, the latter 

 yellowish-green with a black band in the suture next labrum. 

 Labrum yellowish-green with an inverted black T-mark. Labium 

 and mandibles yellowish; mouth broadly edged with black. 



Thorax. — Prothorax black, with two small round central 

 yellowish-green spots close together, and a larger spot just behind; 

 suture yellowish-green. Meso- and metathorax black, with a pair 

 of deep green humeral marks somewhat enlarged in front, so as 

 to resemble a figure 7 with the top part cut off short. Dorsal 

 ridge elevated into a small spike near the middle, and touched 

 for about 1 mm. with a fine yellow line. Following the 7-mark on 

 either side is a narrow subhumeral green stripe, separated from 

 the 7-mark by a broad band of black; next, a rather broad black 

 band; then on the sides the colour is greenish-yellow, with a 

 curved black mark close under the fore wing-joins, and a small 

 dull brownish spot on the mesospiracle. Wing-joins black; 



