112 
bulging anteriorly. Genal processes long, 
slender, acute, divergent, nearly as long as 
vertex. Antennae slightly over twice as long 
as width of head. Eyes large. Postocular areas 
prominent but smaller than in related species. 
Thorax well arched. Pronotum very strongly 
depressed below vertex. Forewings large, 
bluntly angular, with prominent points on 
membrane except along veins, 2.66 times as 
long as wide; Rs long, sinuate, marginal cells 
about equal. Metatibiae with prominent 
teeth basally, 1 outer and 3 inner apical spines. 
Male genitalia large. Proctiger strongly 
swollen caudad, with small apical epiphysis. 
Forceps shorter than proctiger; in lateral view 
broad and straight basally, obliquely truncate 
to blunt, black apex; in caudal view broad 
basally, narrowed to apex; outer margin 
strongly arched in basal half then nearly 
straight to touching apex, inner margins 
touching basally, excavate, then produced, 
then evenly tapered to apex, very stout setae 
on broad lobe thus formed; in dorsal view 
tips black, truncate. Female genital segment 
short, about two thirds as long as rest of ab- 
domen; dorsal valve steeply descending to 
short, straight, styliform apex, with small 
hump bearing tuft of long setae; ventral 
valve nearly as long as dorsal, very strongly 
compressed midway, apical portion brown, 
thickly set with short retrorse setae. 
HOLOTYPE, male, allotype, female, 3 male 
and 3 female paratypes, Whangamoa Saddle, 
January 16, taken on Olearia arborescens. Addi- 
tional paratypes: Falls Creek in upper Holly- 
ford Valley, January 23; Oban, January 29, 
taken on Olearia arborescens, in great numbers ; 
1 female taken at The Neck, Stewart Island, 
February 1, on 0. arborescens; Arthur’s Pass, 
February 5, taken on 0. arborescens; Fox 
Glacier, February 7, taken on an Olearia de- 
termined by Fush as 0. macrodonta or arbore- 
scens (as macrodonta is considered to be a 
hybrid between arborescens and ilicifolia, it is 
interesting that from the single bush of this 
form which I could discover I obtained T. 
compressa, a species which is abundant on 
PACIFIC SCIENCE, Vol. VI, April, 1952 
Fig. 21. Trwza compressa n. sp. a, Lateral aspect of 
male cauda; b, lateral aspect of female cauda. 
arborescens, and T. crinita, a species found 
otherwise only on ilicifolia ) ; a series of males 
and females taken from Olearia rani growing 
in a gully at Te Waewae Bay, January 28. 
HOST PLANTS: Olearia arborescens Cock, and 
Faing and 0. rani (A. Cunn.) Druce. 
This seems to be closest to T. subacuta, T. 
doryphora, and T. subvexa but it is readily dis- 
tinguished by its greater pigmentation, more 
