TiLLYARD.—Studies of New Zealand Trichoptera. 291 
large, with R, running through it. In both sexes, forewing has all five 
apical forks present, but hindwing has only Af,, Af,, and Af,. The correct 
naming of the veins in the male is only possible by comparison with those 
of the female, when it will at once be seen that, in the forewing, M, and M, 
have partially coalesced in the male, so as to produce an apparent fork 
between them distally, whereas the true apical forks, Af, and Af,, lie one 
above and one below this apparent fork respectively. "The branches of the 
cubitus and the end of 1A are also abnormally developed in the male, and 
1A takes much the same position distally that Cu, does in the female, as 
can be seen from text-fig. 5. In the hindwing the male shows very high 
; R 
TExT-FIG. 6.—Neurochorema decussatum n. g. and sp. Venation of hindwing 
of female (above) and male (below). (For lettering see p. 314.) Note the 
closed cell in the radial area of the male, with the incomplete stem o 
В, attached to it above, also the basal fusion of My with M4,,, and the 
peculiar structure of the cubitus and 1A. 
specializations, a wide closed cell being formed below the distal end of Se ; 
this cell is bounded by R,,, basally, К,_, above, R,,, below, and by 
a cross-vein distally. М, has become fused basally with M,+, in the 
same manner as with M, in forewing. Cu, has become bent and fused 
for a short distance with 1A, which is also bent, and there is a strong cross- 
vein connecting Cu, with the fork of Cu,. Text-fig. 6 shows how muc 
more highly specialized the hindwing of the male has become in comparison 
with that of the female. Tibial spurs, 2, 4, 4. Abdomen of female not 
produced into an elongated ovipositor. 
Genotype.— Neurochorema decussatum n. sp. (New Zealand.) 
Neurochorema decussatum n. sp. (Plate 19, figs. 3, 4; text-figs. 5-7.) 
Total length, 5 5mm., $ 5:5 mm.; forewing, 3 8mm., 9 85 т. ; 
expanse, 5 17 mm., 9 18mm 
Head dark brown, with pale hairs; eyes brown; antennae brown, the 
basal segment swollen ; palpi fuscous. 
Thoraz very dark brown, with pale hairs on prothorax. Legs pale 
testaceous. 
: 10* 
