TILLyaRD.—Studies of New Zealand Trichoptera. 289 
formed in both wings, and of normal dichotomic shape in forewing and 
not connected with Cu, by a cross-vein. Anal veins in forewing looped 
up into the typical short double Y-vein found in so many Trichoptera, 
2A not being lengthened as in Hydrobiosis. Pterostigma short in both 
wings. ‘Tibial spurs 2, 4, 4, as also in all the New Zealand genera of this 
family. 
Genotype.—Hydrobiosella stenocerca n. sp. (New Zealand.) 
Hydrobiosella stenocerca n. sp. (Plate 19, figs. 1, 2, and text-figs. 3, 4.) 
Total length, 4-5-5 mm. ; forewing, 7-9 
Head.—Eyes greyish-black. Vertex 
the basal segment with a tuft of dark hairs above it. Maxillary palpi 
brownish, with the bases of segment 3-4 yellowish-brown. Labial palpi 
long and very slender, dull-brownish. 
horax fuscous, marked with brown; pronotum with stiff, dark hairs, 
and sometimes also with some yellowish hairs like those on the vertex. 
Legs testaceous, the tarsi slightly darkened basally. 
Text-ric. 4.—Hydrobiosella stenocer 
lateral view; 6, dorsal view. Note the long, narrow, two-segment 
gonapophyses. (10 per cent. KOH preparation.) 
ca n. g. and sp., £. Appendages ( x 40). 
Wings.— Forewing irregularly mottled with medium fuscous and 
yellowish-brown, showing several more or less conspicuous blotches of 
wing, and a larger oblique and somewhat curved one arising about middle 
e ior margin f 
the markings more or less obliterated, and appear much less variegated 
in colour.  Hindwing semi-hyaline, pale fuscous, slightly darker distally 
than basally, somewhat iridescent along main veins, and sometimes with 
slight mottling like that of forewing around apical margin. 
10—Trans. 
