TiLLYARD.—Studies of New Zealand Trichoptera. 307 
Wings.—Forewing medium fuscous, somewhat transparent in places, 
and more or less strongly mottled with whitish or greyish. Pterostigma 
with whitish or greyish patch; R,, Cu,, and 1A strongly mottled with 
~ whitish. Distal third of wing mottled with patches of abe ag white hairs 
which tend to become arranged in three transverse rows across wing. 
Hindwing subhyaline, somewhat infuscated distally ; Tou fuscous. 
T 
are all from Gouland Downs, Nelson Province (7th February, 1999, 
T.), 2,000 ft. Also a single n slightly larger, from Mount Arthur 
Tableland (20th February, 1921, A. Philpott), 4,500 ft. All the above in 
Cawthron Institute collection. 
9. Very similar to male, but with shorter antennae and win 
expanse only 18 mm. abdomen stouter than in male; hindwings о 
trans . 
This aene is fairly closely related to 7. obsoleta McL., from which 
it is distin ed at once by its very much smaller size, "duller color- 
ation, and diffefently-shaped male genitalia. It appears to be confined to 
elevated localities in the South Island, where it is to be found sitting on 
the reeds or bushes fringing small mountain-tarns. The larva has the very 
characteristic habit of forming its case out of arep particles of micaceous 
matter selected from the bottom of the tarns; the case itself is very 
narrow subcylindrical in shape, and can illy be detected only by the 
glint of the sun on the micaceous particles when the larva moves. 
Family SERICOSTOMATIDAE 
This family is in many specia the most highly evolved in the whole 
order, being marke EE umerous specializations in the wing-venation, 
. the form of the antennae, and more especially in the structure of the 
maxillary palpi of the iid these being reduced to four, three, or even 
only two segments, and specialized so as to be of quite different. form 
land, no less than ten species being known, belonging to seven genera. 
Six new species are here added, and one new genus is proposed for the 
reception of four of them. 
` Genus PycNocENTRODES n. g. (Text-fig. 21.) 
Руспосеттіа McL., from which it differs by the absence of 
the web fold in forewings of male, and the consequent normal 
structure of the radial sector in both sexes. The radial cell is present, 
and is of a somewhat narrowed, elongate form, basal portion being 
particularly narrowe some cases the stem of R,., ma 
weakened or obsolescent, so that the radial cell is incomplete above (as 
in P. oling n. sp.), but venation is always very distinct from that 
of Pycnoce vele (text-fig. 22), where all the branches of Rs, M, and Cu, 
come off direct from longitudinal fold. Stem of R,;, in hindwing of 
male also саси or obsolete, leaving radial cell open above. Apical 
forks of forewing all present, as in Pycnocentria ; in hindwing, only 1, 2 
a 
of male. Tibial spurs 2, 2, 4. Maxillary palpi of Munt short and hairy, 
not prejesting beyond end of first antennal segmen 
Genotype.—Pycnocentrodes chiltoni n. sp. (New Zealand.) 
