TILLYARD.—Stone-flies of New Zealand. 211 
Epicranium and pronotum blackish, the latter 1-4mm. long by 2mm. 
wide, and having the posterior lateral corners produced into two strong 
projecting spines (fig. 11,5). Appendages strongly upcurved, sharply 
pointed, with the shorter copulatory hook lying between them and 
a есй blunt apex. Venation closely similar to that of N. нов n. sp. 
Female closely similar іп size and general appearance to male, but 
having the posterior lateral corners of Bg pronotum cut off sharply at 
right angles, thus differing from those N. howesi n. sp., which are 
rounded. Abdomen much slenderer tan in N. howesi, reddish-brown in 
colour, darkest at base, and becoming bright-reddish apically. Ventral 
plate much less prominent than in N. howesi n. sp. 
Types.—Holotype female, allotype male, and series of six paratype 
males in Cawthron Institute collection. (ilia y pe and allotype, 18th 
J pv 1920, Arthur's Pass; R. J. T. 
ty.—Arthur’ s Pass, January, 1920; taken both by Mr. Howes and 
шун. 
Nesoperla trivacuata n.sp. (Fig. 12.) 
d. Forewing, 8:5 mm. ; hindwing, 7 mm. ; expanse, 18 
In this species the head, thorax, and арба are all brownish- black, 
the pronotum having a de finite median longitudinal impressed line on it. 
The pattern of the wings is very distinctive, as can be seen from fig. 12. 
The ground-colour of the forewing is either кон өр or brownish, and is 
interrupted by three large irregular areas, nged more or less trans- 
versely at wide intervals across the wing, hen areas being very pale and 
subhyaline. There is also sometimes a pale area of irregular shape close 
to the base. The size and shape of each of the three subhyaline patches 
' varies greatly in different specimens: sometimes they are more or less 
oval, with fairly regular outline; sometimes more like transverse fasciae, 
with irregular outline. The typical and most common form has them 
very much as shown in fig. 12. Legs a bright medium ion. Cerci З mm., 
brownish. Appendages short, ‚ dark, шет. "e 
9. Forewing, 11 mm indwing, expans 
23 mm. 
Closely resembling the Hie, but nie forewings more fuscous. 
(Abdomen shrivelled, so that ventral plate cannot be s 
ypes. — Holotype male (Lake Rotorua, 18th Мо ошен, 1919; R: J. T.), 
allotype female (Tokaanu, Lake Taupo, 24th cerent 1919, К: J. T), 
and series of paratypes in Cawthron Institute collectio 
Locality.—Appears to be generally distributed дан New Zealand, 
but ese in the North Island. 
es.—A variety frequently occurs 1 in which the most basal of the 
three incipiet patches is either наа. ог quite absent. In one 
specimen this and the middle patches have coalesced. 
Genus AUCKLANDOBIUS End. 
Enderlein, Deutsche entom. Zeitung, 1909, pp. 680-82. 
Closely allied to Nesoperla n. g., but differing from it in having the fore- 
wing distinctly shorter than the hindwing, and the cerci longer than the 
abdomen. 
Genotype—A. complementarius End. 
This genus is адаы in the shortening of the forewing without 
any corresponding shortening of the hindwing. There are a number of 
instances known in the Perlaria in which certain species pum reduction 
