TiLLYARD.—Studies of New Zealand Trichoptera. 287 
strongly bifid. The same character is to be found in Tiphobiosis n. g., 
and is possibly present in other related genera also. 
Genotype.— Н ydrobiosis frater MeL. (New Zealand.) 
our species of this genus are known—viz., H. frater McL., H. umbri- 
pennis McL., H. ingenua Hare, and H. stigma Ulmer; the first three of 
these occur in New Zealand only, the fourth in Queensland. The descrip- 
tion of H. ingenua given are mentions neither the venation nor the 
form of the male appendages, so that the species is quite unrecognizable 
Text-Fic. 1.—H ydrobiosis ripe 1 меа d. Wing-venation. 
(For lettering see p. 314.) 
except by examination of the use I have seen specimens in Mr. G. V. 
Hudson's collection determined by Mr. Hare as obiosis occulta Hare 
(a bes which he described at the same time as H. ingenua), and they 
undoubtedly belong to the genus Hydropsyche; so l omit the species 
ee Hare from the list of known species of Hydrobiosis, and remove 
ydropsyche. Whether ч ingenua Hare really belongs to Hydro- 
biosis or not I am unable to sa 
Genus Psttocnorema MeL. (Text-fig. 2.) 
McLachlan, Trans. Entom. Soc. London, 1866, ser. 3, v, p. 273. 
A very remarkable genus, recognizable at once AT the closely parallel 
arrangement of the veins in the distal part of the forewing; the 
peculiar shape of the forewing, which has the „а! ua sterior margins 
parallel for the basal half, but the apical half of the wing is dilated by 
apex; by the very elongated pterostigma of the forewing, and by the 
presence of an extra small closed cell € distally from the radial cell 
in the forewing, between R, an ^ closed distally by a short cross- 
vein. These characters are clearly owas in text-fig. 2. 
It should be noted that McLachlan, in his diagnosis of this genus, 
states that five apical forks are present in both the forewing and the hind- 
wing. This is an error, Af, being absent in the hindwing, as is all known 
Trichoptera. 
