Trttyarp.—Stone-flies of New Zealand. 209 
Ккү vo THE SPECIES OF THE GENUS NESOPERLA. 
( Forewings unicolorous semitransparent br bro 2 
RE Dey e та a definite pattern of du adir light and 
dark а 
3 
Larger species (forewing 13 mm.) with large reddish- brown 
pro , the posterior oe aei of which are 
unio’ th the female. (Male unknown) N. howesi n. sp. 
Smaller species (forewing 11:5 mm.), of slenderer build with 
maller blackish pronotum, the posterior corners of which 
are produced into two promi minent о їп ihe. male and 
cut off at right angles in the female N. spiniger n. sp. 
Forewings greyish ochreous, each distal cross-vein surrounded 
by a small pale subhyaline area N. fulvescens (Hare). 
3 < Forewings brownish ог fuscous, with three › (more rarely only 
two) large subhyaline areas "extending ns gr across 
| the wing at wide intervals .. N. trivacuata n. sp. 
Nesoperla fulvescens (Hare). (Fig. 9). 
Leptoperla fulvescens Hare, Trans. N.Z. Inst., vol. 42, p. 29, 1910. 
The venation and pattern of the forewing of this very striking species 
are shown in fig. 9. Besides the very characteristic formation whereby the 
distal cross-veins are isolated within jen subhyaline areas, there is also a 
larger irregular area of the same kind r aching from the basal portion of 
Rs across the fork of M and across Cu, to end on the apex of Cu, ; this 
area varies somewhat in different specimens, gi is roughly triangular, its 
base being on Rs and its apex on Cu,. There is a complete set of dista 
cross-veins between М, +, and Cu,, but the ыйа сугы do not continue 
quite to the end of Cu,. 
Type in Mr. Hare’s collection. 
Locality —Karori, Wellington. I have not taken this species. 
Nesoperla howesi n. sp. (Figs. ту 11 a, c.) 
©. Forewing, 13 mm. ; hindwing, 11 mm. ; expanse, 27-5 mm 
Head rich reddish- brown, except for the triangular space between the 
ocelli, which is blackish, and a narrow bar of blackish running from each 
lateral ocellus to the compound eye. Eyes very dark brown. Antennae 
9mm. dii yellowish-brown, pubescent, with a few longer delicate hairs. 
Thorax Do rich brown, 1-7 mm. long by 2:2 mm. wide, shaped 
as shown in fig, 11, а, the posterior lateral corners being well rounded. 
Meso- and ibo aret black. Legs brown, the middle femora darkened 
beneath. 
Abdomen black, touched with reddish-brown on sides ; 3 segment 10 rich 
brown. Ventral plate жа enge in the form of a semi-oval lobe, iie 
narrow, covered with fine hairs (fig. 11, c). Cerci 3-5 mm. long, brown 
Wings: Forewing a perc semitransparent brownish-testaceous, 
in life very bright and having a distinctly reddish tinge; the veins slightly 
darker. Hindwing paler, more inclined to greyish except along costa, 
which remains brownish. Venation of forewing as shown in fig. 10, with 
Se forked at its apex Misa the form of apex of Se in forewing of 
N. fulvescens—fig. 9), few distal cross-veins irregularly placed, only two 
between М, +, and Cu, instead of a complete set as in N. fulvescens, and 
a long space * listally below Cu, without cross-veins. 
ype.—Holotype female, unique, in Cawthron Institute collection. 
Locality.— Arthur's Pass, female, 18th January, 1920 (R. J. T.). 
