312 Transactions. 
This species is dedicated to my friend Mr. Harold Hamilton, Zoologist 
to the Dominion Museum, Wellington, who was present with me when the 
insects were taken. 
Genus Heticopsycue Hagen. 
Hagen, Entom. Monthly Magazine, vol. 2, p. 252, 1866. 
tively. This transference of vein M, on to a common stalk with М, +. 
in this wing led Ulmer to state that Af, was present in the hindwing of 
this genus and of the allied Australian genus Saetotricha. As a matter of 
fact, Af, is never present in the hindwing of any Trichopteron, since M, 
never exists as a separate vein. 
The larval characteristics of the genus are well known, the generic name 
having been given from the helicoid form of the case, which is composed 
of grains of sand, and is so beautifully modelled as to appear almost exactly 
like a small snail-shell. To accommodate itself to its peculiar home the 
larva has become greatly elongated. 
Genotype.—Helicopsyche borealis Hagen. (North America.) 
Only a single species has so far been recorded from New Zealand—viz., 
Н. zelandica Hudson (Plate 19, fig. 18)—more fully described by Hare in 
1910, Hudson's original description being very scanty. Two more species 
are here added, making three for the Dominion. They may be distinguished 
by the following key :— 
1. Wings dark fuscous or blackish A s z4 .. Н. zelandica Huds. 
Wings very pale greyish .. ә ic s oe 2 
2. Smaller species, expanding 9-10 mm., the wings unicolorous 
whitish-grey, without any markings; process of tenth tergite 
of male narrower at apex than at base, the tip triangularly 
excava Fa d з Se Ap .. AH. albescens n. 8р. 
Larger species, expanding 11-12 mm., the wings pale-greyish, 
with slight indications of some paler markings on forewing ; 
proce tenth tergite of male as broad at apex as at base, 
the tip strongly truncated iue n = .. Н. howesi n. 8р. 
Helicopsyche albescens n. sp. (Plate 19, fig. 19 ; text-fig. 26.) 
$. Total length, З mm. ; forewing, 4-5 mm. ; expanse, 9-5 mm. 
The whole of the head, thorax, and abdomen dull brownish-testaceous, 
except eyes, which are blackish, and antennae, which are testaceous ; legs 
pale greyish-testaceous. 
Wings semitransparent whitish, with very pale greyish hairs and fringe ; 
Shaves pale-greyish. Appendages of very characteristic form, as may 
bristles ; pre-anals short and slender; h large, two- 
branched, and exceedingly hai Mr; See PU m 
Types.—Holotype male allotype female, and series of t males, - 
' , paratype à 
Purau Creek, Lyttelton Harbour (3rd J 1920. В. J. T); all m 
:Cawthron Institute collection. ( anuary, ; ) 
