Tittyarp.—Stone-flies of New Zealand. 215 
not so much enlarged as in Z. decorata, nor is the pronotum so definitely 
marked with grooves (fig. 146). 
Types.—Holotype female and series of paratypes in Cawthron Institute 
collection. (Holotype, Arthur's Pass, 16th January, 1920; R. J. T.). 
" — Locality.—Arthur's Pass, January, 1920; taken by Mr. Howes and myself. 
Some of the specimens show a distinct thickening of the E n 
of the forewing, which tends to become unicolorous reddish-brown ; i 
these cases the pterostigmatic veinlets become weak, and are not easy to 
see except with transmitted light. 
Family NEMOURIDAE. 
'This family, so abundant in the Northern eie. has not yet 
been recorded from either New Zealand or Australia. A single genus, 
Udamocercia End., is known from Tierra del Fueg o and southern Chile. 
The family is nevertheless found in both New Гена а and Australia, 
recognized at once by having no external gills, and apparently no cerci ; 
though, as a matter of fact, cerci are present, consisting of a single segment 
у. 
This is the only aei present in New Zealand and Australia in which 
a transverse cord or anastomosis is developed on the wings. This trans- 
verse cord divides the ‘Sih into two nearly equal portions, the distal one 
containing only a set of main veins running subparallel to one another, 
and entirely devoid of cross-veins. e anal fan is usually less wide than 
in Leptoperlidae, and the third branch of 3A i is very short. 
KEY To THE GENERA OF NEMOURIDAE FOUND IN NEW ZEALAND. 
Wings rather broad, Sc not arching so as to meet or nearly to meet 
the costal margin. ross-vein m-cu ending above exactly at 
the мей fork and in line with the "eet dm of Mi +2 above 
it, in the forewing Notonemoura n. g. 
Wings narrower, p ане up so as to meet or nearly meet the 
: ostal margin. Cross-vein m-cu in forewing en above on 
M344 at an angle m it; this latter vein much curved as it 
leaves the transverse cor rd .. Spaniocerca n. g. 
Genus NoTONEMOURA р. g. (Fig. 17.) 
Characters as in the key given above, to which may be added the 
following : Veinlets Sc, and R,, present in pterostigma of forewing, Sc, 
only in that of hindwing. Intereubital space of forewing very wide ; : 
Cu, diverging strongly from Мз +4 at its apex. 
Genotype.-—Notonemoura latipennis n. sp. 
Notonemoura latipennis n.sp. (Fig. 17.) 
d. Forewing, 6 mm. ; hindwing, 4-8 mm. ; expanse, 13 m 
Head testaceous ; eyes, ocelli, за two spots in front of xdi ocelli 
blackish. Antennae 4 mm. long, dull greyish-brown, with slender whitish 
annuli zi bese of each segment. 
Thorax : Pronotum rectangular, wider than long, testaceous, with a 
narrow ное transverse blackish band, a well-marked median longi- 
tudinal groove, and on either side a crescentic dark mark and an outer 
spot, the former merging posteriorly into a broad dark posterior transverse 
