4 
Records of the Australian Museum (2016) Vol. 68 
5 Arista-like stylus subequal to or longer than length of 
postpedicel; male hind femur swollen, wider than mid femur (as 
in Fig. 4), slender in female; hind tarsomere 4 unmodified in both 
sexes, not laterally compressed . 6 
Arista-like stylus shorter than length of postpedicel; hind femur 
slender in both sexes, not broader than other femora (Figs 
5, 6); hind tarsomere 4 laterally compressed in both sexes, 
with ventral keel . 8 
6 Disc of scutellum with numerous long setulae; male cercus 
Y-shaped, apex of surstylus with straight spine-like projection; 
postgonite digitiform, erect and extending beyond margin of 
epandrium (Fig. 25). H. queenslandensis sp. nov. 
- Disc of scutellum with at most 1-2 pairs of long setulae; male 
terminalia otherwise . 7 
7 Arista-like stylus 2.5 times length of postpedicel; male cercus 
unforked, lying horizontally on epandrium, apex bent medially 
at right angle; apex of surstylus strongly rounded with stout setae 
on inner face; postgonite short, broad and truncate (Fig. 9). H angulata sp. nov. 
- Arista-like stylus only slightly longer than postpedicel; male 
cercus antler-like, lower branch shorter than upper; apex of 
surstylus strongly hooked and arched anteromedially; postgonite 
sickle-shaped and hooked (Fig. 11). H. cornuta sp. nov. 
8 Large species, wing at least 6 mm long (Fig. 5); face with row 
of long setulae on inner margin of eye (Fig. 13); scutellum 
with setae confined to margin; male foreleg with tarsomere 1 
unmodified; male mid femur modified with knob-like ventral 
process (Fig. 15). H. tasmanica sp. nov. 
Smaller species, wing less than 4 mm long (Fig. 6); face lacking 
setulae; scutellum with setulae dorsally on disc; male foreleg 
modified with claw-like process on tarsomere 1 (Fig. 18); male 
mid femur without knob-like ventral process. H. unguicula sp. nov. 
Hydropeza angulata sp. nov. 
Figs 7, 9 
Type material. Holotype S, labelled: “AUST: N.QLD:/ 
31.6km/ up Mt. Lewis Rd., 860m/ 21.iv.1994, cascading/ 
creek, B. J. Sinclair/ 16°30'S 145°17'E”; “HOLOTYPE/ 
Hydropeza/ angulata/ Sinclair [red label]” (AMS). Paratypes: 
Queensland: 1$, 2$ $, 14.7 km up Mt. Lewis Rd., 860 m, 
22.iv. 1994, cascading ck, 16°30'S 145°17'E, B. J. Sinclair 
(CNC); 1<J, 4$ ?, same data as holotype (AMS). 
Diagnosis. This species is distinguished from other 
Queensland species by acrostichal setae confined anteriad 
of an imaginary line connecting the first (anteriormost) 
dorsocentral setae; arista-like stylus 2.5x length of 
postpedicel; male scutellum with 0-1 pair of elongate discal 
setae; male mid femur with row of short basal posteroventral 
setae and mid tibia with short row of spine-like setae 
on apical third; male hind trochanter without spine-like 
anteroventral setae; and male cercus unbranched, with apex 
bent at right angle medially. Females are distinguished 
from all other species by discal setae mostly absent on the 
scutellum and segment 8 generally retracted within the 
abdomen and flattened. 
Description. Head and abdomen dark brown, thorax 
brown with paler patches; coxae brownish yellow, legs 
progressively darker towards tips. Wing length 4^1.2 mm. 
Male. Head. Ocellar setae very long, erect, divergent, 
inserted posterior to anterior ocellus; ocellar tubercle with 
some long setulae; postocellar seta stout and dark; upper 
postocular setae stout and dark, lower setae fine and slender; 
postgenal setae similar to lower postoculars. Face without 
setulae. Scape, pedicel and inner base of postpedicel slightly 
paler than remaining postpedicel; scape short and slender, 
slightly longer than length of globular pedicel; postpedicel 
not greatly prolonged, less than 2x longer than scape, basal 
portion elongate-oval, 2x longer than tapered apical portion; 
arista-like stylus 2.5x longer than postpedicel, concolorous 
with postpedicel. Proboscis stout and robust, extended 
beyond mid-length of fore coxa, directed posteriorly; palpus 
half-length of proboscis, clothed in long pale and dark setae; 
apex of palpus rounded; apical third of palpus flattened with 
dense pubescence. 
Thorax. Clothed in fine pruinescence; mesonotum brown, 
with postpronotal lobe, lateral margin and postalar ridge pale 
brown; pleura paler than notum, pale along sutures. Setae 
generally long and stout; 2-4 acrostichal setulae confined 
anterior to 1st dorsocentral setae, less than 0.5x length of 
dc; pprn with 1 seta and 1-2 short setulae; 1 long presut 
spal; 5 uniserial dc, about subequal in length with several 
setae interspersed; 3 npl; 1 long psut spal and several shorter 
anterior setae; 1 pal seta and 1-2 pale setulae; 1 pair of sctl, 
