BY R. J. TILLYARD. 235 



Til or ax: Pronolum dark grey, brown along anterior hurdt'v. Mesa- and 

 metatltorax shiny brownisli. Legs dark grey touched with brown. 



Abdomen (shrivelled) dark brown. Cerci 5 mm. long, black with pale 

 brown cilia, the basal joints somewhat shorter than wide. Superior appendages 

 upcurved, dark brown, the outer border convex, the tips hard, black, inclined 

 inwards. PeniK a little longer than appendages. 



Type: Holotype cf. taken by Dr. A. J. Turner at Montville, Blackall 

 Ranges, Queensland, Oct. 5th, 1912; in Tillyard Collection, Cawthrun Institute, 

 Nelson, N.Z. In the same collection there are also a male bred from a larva 

 taken at Maleny, near Montville, by myself, on Nov. 28th, 1915, and a larger 

 specimen, expanse 60 mm., probably a female, but with abdomen missing, taken 

 by Mr. G. Lyell at Stanwell Park, N.S.W., on April 22nd, 1910. Another speci- 

 men labelled "Victoria. Whittlesea" is in the Collection of the National Museum, 

 Melbourne. 



Hah. — Fast mountain streams in Eastern Australia, but not Tasmania. The 

 larvae exuviae are common objects on the rocks in the streams of the Blue Moun- 

 tain.s, N.S.W., but the perfect insect is seldom seen, as it flies but little. 



Genus Diamphipnoa Gerst. (Plate xiv.. Fig. S. ) 



Characters as given in the generic key on p. 233. The imago has four pairs 

 of abdominal gills, on segments 1 — 4, carried over from the larva. I think this 

 carrying over of abdominal gills in the imago occurs in all the Ewstheniidae , as 

 I have certainly seen them in newly-emerged specimens of Eusthenia lacustris 

 and Stenoperla australis; but they very soon shrivel up, so as not to be clearly 

 discoverable in mature specimens. Probably the great size of the species D. 

 annulata makes it possible, in this case, to see these delicate organs more clearly 

 in the imago. 



Genotype, Diamphipnoa annulata (Brauer) . 



Diamphipnoa annulata (Brauer). (Plate xiv.. Fig. 8.) 



Stenoperla annulata, Brauer, Verhandl. zool.-bot. Gesell. Wien, xix.. 1809, p. 

 17. Chili. — Diamphipnoa lichenalis, Gerst., Festschr. nat. Freunde, 1873, p. 64, 

 %. 17. 



There is a mag-nificent specimen of this tine insect in the Hope Museum at 

 Oxford. Forewing, 44 mm.; antenna, 35 mm.; total length, 28 mm.; exjmnse, 

 90 mm.; cerci, 8 mm. The general colour is grey, the forewings grey with dark 

 brown veining and irregular clouding of brown along the cross-veins, especially 

 at each end where they join with the main veins; the hindwing.s paler grey, with 

 brown veins, and clouding of darker grey at ends of the veinlets along distal 

 half of costal bordei-. The specimen is a female, labelled ''Chili, 1800." The 

 photograph shown in Plate xiv., tig. 8, is taken from this insect. 



Cawthron Institute, Nelson, N.Z., 12.3.1921. 



EXPLANATION OF PL.ATES XI.— XV. 



Plate .\i. 



Fio;. 1. Tliaumatoperia robnsla, n.g. at sp., 2, (x 2.7). 

 Fig. 2. Eusthenia costaHs N. Banks, J', (x 2.7). 



