BY R. J. TILLYARD. 231 



space; a considerable gap between the hiiiiieral veinlet and the nest costal 

 veinlet, wliich arises just before the origin of Rs. Subhumeral oval marlv small 

 but well defined. Radial red mark very small, beginning beyond the point of 

 departure of M from R-)-M, and ending just before the level of the lunule. 

 LuiRile very distinct, whitish, very narrow (barely 1.5 mm. wide), forming a 

 very distinct crescent, not touching R. In the hindwings, the division between 

 red and grey-black is eulegnie, beginning about half-way along the costa, then 

 proceeding downwards at right angles to the eosta as far as the vena dividens, 

 where it bends sharply round, leaving an amount of marginal black on tlie anal 

 fan almost as wide as the gi'eatest width of the red. 



d", expanse 36 mm. Cerci 10 ram. long, black with rings of pale brown cilia, 

 basal joints longer than wide. Superior appendages bluntly rounded at apices, 

 with a strong, short spine at outer distal angle. Closely resembling the female. 

 but ditfering in its much smaller size, and in having the distal border of the 

 lunnle not quite so regular, and the lunule itself slightly wider in comparison with 

 its length. 



Types: Holotype 2 and allotype <J in Tillyard Collection, Cawthron Insti- 

 tute. Nelson. Both taken at Ci'adle Mountain, Tasmania, altitude about 3000 feet. 

 the female on January 21st. the male on Jan. 23rd, 1917. Also a paratype ? 

 from same locality, Jan. 23rd, 1017. 



nab. — Only known from the streams around Cradle Mountain at high ele- 

 vations. 



EusTiiENiA LAC'usTRis, u.sp. (Plate xii.. Fig. 5.) 



?, expanse 47 mm. A very distinct species, easily recognised hy tlie follow- 

 ing characters: — The whole body shining black; femora black, the tibiae and 

 tarsi brownish. Forewings brownish black with black veins showing up clearly; 

 pale reticulation entirely absent ; costal space purple, the same colour extending 

 beyond the lunule right to the apex; base of wing for about 2 mm. is also pur- 

 plish, and this colour just reaches the very indistinct subhumeral oval mark. 

 Lunule whitish, vei-y clearly defined, narrow (about 1.5 nun. wide), not quite 

 I'eaching the posterior margin of the wing, and confluent above with the radial 

 mark ; this latter is very strongly developed, bright red, .and confluent with the 

 whole width of the lunule distally; it also sends a strong transverse prolonga- 

 tion downwards covering the whole of M.-,. Hindwing-s with the division between 

 red and black moderately eulegnie. shaped as in E. lunulata. hut with the red 

 occupying a larger area of the base of the wing. 



c?, e.rpaiise 39 mm. Cerci 12 mm., black, strongly ciliated, basal joints about 

 iis wide as long. Superior appendages blunt at tips, and each carrying on its 

 basal half inwards a strongly projecting sjiine. Closely resembling the female, ■ 

 but with the red of the radial mark extending anteriorly on to the costa. A 

 lateral view of the appendages is shown in Text-fig. 3. 



Types: Holotype 5 and allotype c?, in Tillyard Collection, Cawthron Insti- 

 tute, Nelson, N.Z. (taken in cop, Lake Lilla. Cradle Mountain, Tasmania, Jan. 

 12th. 1917); also a series of paratypes of both sexes, taken around Cradle Mdiui- 

 tain in the same month. 



Hah. — Lakes Lilla and Dove, and Crater Lake, Cradle Mountain, about 3200 

 feet, Tasmania. This is the only species known to me whose larva inhabits the 

 still water of lakes. All the others live in the fast running mountain torrents. 



This species is probably most closely allied to E. lunulala. with which it 

 agrees in the narrow fonn of the lunule, but can be at once separated from it by 



