314 Transactions. 
This species is dedicated to my friend Mr. W. G. Howes, whose guest 
I was at the time the insect was taken, and whose keen work on aquatic 
and other insects is well known to all entomologists in the Dominion. 
EXPLANATION OF THE ÜoMsTO:K-NEEDHAM NOTATION USED IN THE TEXT- 
FIGURES ILLUSTRATING WiNG-VENATION 
The numerals 1, 2 3, 4, 5 indicate the five apical forks of the wing, usually 
Desc (uir in hr text as Af,, Afs, АҒ», Af,, and Af; respectively. 
1A, 2A, 3A, the вэ ан veins ; in the forewings of Trichoptera they become 
looped iios ei pes a double 
Cu, itus. Cu,, first pie branching into Cu;, and Cu,» between which is 
enclosed КЕ fifth apical fork, Af; 
hm, humeral veinlet. im, ОАЕ cross-vein. ir, inter-radial cross-vein. 
jl, jugal lobe (in Rhyacophilidae e). 
M, media. In forewing it has four branches, Му, Mo, M3, M, respectively, of which 
the first two Miis the third apical fork, Af4, while the third ‘and fourth enclose the 
— е fork, = x In the hindwing it has only e. branches, M,, Mo, and Mg+4 
espectively, and hence Af, is never ен in that 
_ m-cu, medio-cubital е CTOSS-Y c, median all ра distally by the cross- 
vein im. рі, pterosti 
ius. R4, ES main stem. Rs, radial sector, with its four branches Ro, Ез, 
сеча of these, Б, and В; together enclose the first apical fork, Ағ, 
R, and R; together enclose Mi second apical fork, Af, ; the wing-spot is is found 
in ind angle of this latter for 
f- ы ае отав cross." -vein. rc, radial cell, closed distally by the inter-radial 
CTOSS-V 
Sc, уе tc, thyridial cell, closed distally by the medio-cubital cross- -vein m-cu. 
EXPLANATION OF PLATE 19. 
Fic. 1. .—H ydrobi iosella stenocerca n. g. and sp. Holotype ma z 
Ето. 2. Н ydrobi nocerca n. g. and вр.  Allotype еж 
Fre. 3.— Ле eurochorema, decussatum n. g. and sp. Holotyp 
IM 4.—Neurochorema decuss п. g. апа sp. Allotype female 
IG. 5.—Hydrochorema crassicaudatum n. g. and sp. Holotype male 
a 6.— Н ydrochorema nuicaudatum n. sp olotype female. 
n |.—Synchorema zyyoneura n. g. and T =e male. 
6. 8.—Hydropsyche philpotti n. sp. Holotype m 
Fic. 9.—Philorheithrus us agilis (Hudson). Rather broad-winged and well-marked male 
om 
Fic. 10.—Philorheithrus lacustris n. He olotype ma 
Fic. 1 l'riplectides oreolimnetes n. Б H кб тет; 
33 : 12.—Triplectides oreolimnetes n. sp. Allotype female 
I 13.— Pip obiosis montana n. g. et sp. Holotype male. - 
Fee M-a ycnocentrodes chiltoni n. g. and sp. Holotype male. 
I + vod yenacmirodar- qu ella n. sp. Holotype male. 
е Si Pycnocentrodes olingoides n. sp. Holotype male. 
en E —4 ycnocentrodes hamiltoni n. sp. Holotype m 
male. 
3.—] dent ieee ves Hudson. Specimen from Karori, Wellington (Nov. 30, 
191 
Fie. 19. —Helicopsyche albescens п. Spec dnos 
Ў imen наги Ison (Jan. 1, 1921, A. Phiipo 
Ето. 20.— Helicopsyche "peeing n. x Halotzpe s. pe 
All the figures in the plate are magnified 1-3 diameters. 
