286 Transactions. 
field; the individual records are given under each species. I also desire 
to thank Mr. W. C. Davies, Curator of the Cawthron Institute, for the 
photograph from which Plate 19 has been prepared. 
Family RHYACOPHILIDAE. 
p to the present only two genera of this family have been found in 
New Zealand—viz., Hydrobiosis McL. and Psilochorema McL. The former 
New Zealand.* Five new genera are here proposed to be added for the 
reception of seven new s ecies. The family is a difficult one to study, 
and in order to facilitate such study I give herewith figures of the wing- 
venation and a dichotomic key to the seven New Zealand genera :— 
KEY to THE NEW ZEALAND GENERA OF THE FAMILY RHYACOPHILIDAE. 
— 
. Forewing with the branches of M normally developed . 
Fore with М, and M, fused basally for some distance, so that an 
apparent apical fork i is formed distally between them 
Genus ХепкосновкмА n. g, do 
2. ie with the radial cell eas closed distally by a cross-vein 
ot symmetrically pointed at apex 
а with the radial cell absent, and the apex symmetrically point nted 
Genus TIPHOBIOSIS П. 8. 
3. Radial cell of эана dh — — distad by a second small inen cell . 
Radial cell of for чене small closed cell yore to it 
distad, йр асыр: de NS em 
4. Forewing with both Af, and Af, sessile on the radial cell 2 
rele with either nas or ed ps both stalked from the radial cell. - 
2 in forewing en ut level of beginning of pterostigma, well 
beyond ІА ; 24 1 ng ; fork of wes not dichotomic, attached basalh 
is 2 by a CTOSS-vein . Genus HypROCHOREMA р. &- 
Cus in forewing ends by a strong curve at вате point as as 1A, half-way pee 
the wing; 2A M short; fork of Cu, dichotomic, very long, 
- connected with us Е еи g 
Forewing with Af, iie on the radial cell, АЁ, stalked Genus H Y PROBIOSIS McL. 
Forewing with Af, stalked, Af, sessile on the radial cell ? 
Genus NEUROCHOREMA n. B» * $ · 
7. The small cell distad from ext -— cell in forewing is closed distally b 
fusion of В, and К; of the distal part of the forewing 
neither close together nor porsie el nus SYNCHOREMA 0. 8: 
e smali cell distad from radial cell in forewing is closed distally by a 
cross-vein; veins of the distal Tes of the forewing c" together 
and parallel Genus PsILOCHOREMA MeL. 
m 
emu e, 
» 
Genus Hyprosiosis MeL. (Text-fig. 1.) 
Mime Journ. Linn. Soc. nen. 1871, x, p. 206. 
wing, with short Mak and the very Е ЗА i in the 8 Text-fig. 1 
\ ы г character of the genus, not previously noticed, is that the 
fes em appear to be four-segmented, owing to the mentum being very 
а EET 
ж : 
Ps. (?) aculeatum Blanchard is a Chilian insect doubtfully referred to this genu? 
АИ RETO hid 
дд Ке 
Еа 
ARCADE аа. X 
e ЭРИК РУР ОЧАИ a a E 7 ax 
ANK 
VER A. 
