10 
Records of the Australian Museum (2016) Vol. 68 
Figures 21-22. Known distribution of the new Hydropeza species: (21) H. aptera sp. nov. (if); H. unguicula sp. nov. ( ■ ); and (22) H. 
tasmanica sp. nov. (•). 
Hydropeza aptera sp nov. 
Figs 1-3, 10, 21 
Type material. Holotype S, labelled: “TAS: McPartlan 
Pass,/ 42°51'S 146°ll'E/pitfall ARE(Y); 17./viii.1999; M. 
Driessen”; “HOLOTYPE/ Hydropeza/ aptera/ Sinclair [red 
label]” (AMS). Paratypes: Tasmania: 1$, same data as 
holotype, except ARE(Y)4, 14.ix. 1999 (AMS); 1§, same 
data as holotype, except ARE(Y)8,28.vii. 1999 (AMS); 2SS, 
McPartlan Pass, buttongrass moorland, 28.vii.1999, pitfall 
tp, TRW6, 42°51T2"S 146 0 12'39 M E, 320 m, M. Driessen 
(CNC); 1$, ditto, except TRE(O) 16.V.2000 (CNC); 1$, 
4$?, Airstrip Rd, sites 1A-6P, 42°51'5"S 146 0 ir24"E, 
pitfall tp, 29.v.-5.vi.2001, M. Driessen (AMS); 1?* 
ditto, except ARE(Y), 42 o 50'30 M S 146°14'36 M E, 320 m, M. 
Driessen (AMS, CNC). 
Diagnosis. This is the only apterus species of Hydropeza , 
with the wings reduced to halter-like appendages and legs 
and scutum with reduced chaetotaxy. 
Description. Head and thorax dark brown to black with 
greyish pruinescence, abdomen brown to black with thin 
pruinescence; legs dark brown. Wing appendage length 
0.3-0.4 mm. 
Male. Head. Oval, produced posterodorsally, somewhat 
flattened dorsally. Ocellar setae short, erect, divergent, 
inserted between posterior and anterior ocelli; ocellar 
tubercle with some short setulae; postocellar and postocular 
setae short and slender; postgenal setae pale, slender, 
longer than postocellar setae. Face very narrow, closely 
approximated, lacking setulae. Scape short and slender, 
subequal in length to pedicel; postpedicel pointed-ovate, 
longer than scape and pedicel combined, with very short 
knob-like apical stylus. Proboscis stout and robust, short, 
extended well beyond mid-length of fore coxa, directed 
posteriorly; palpus very short, oval about 0.15x length of 
proboscis, clothed in pale setae; apex of palpus rounded. 
Thorax. Greatly shortened and reduced due to apterus 
condition. Clothed in fine pruinescence; mesonotum with 
chaetotaxy reduced; scutellum shorted with pair of short, 
pale apical setae. 
Legs. Brown, fore coxa with fine pruinescence, similar 
to thorax. Inner anterior margin of fore coxa with some 
20 dark spine-like setae, mostly concentrated apically and 
mid-basally; setae not longer than width of coxa. Anterior 
surface of mid and hind coxae with long brown setae. Legs 
lacking long, fine setae. Fore femur distinctly broader than 
mid and hind femora; basal third with 4 long posteroventral 
setae, longer than femur width; anteroventral face with fine, 
pale setae. Fore tibia with 4 anteroventral, 2 posteroventral 
spine-like setae. Fore tarsomere 1 with 4 anteroventral 
and 4 posteroventral stout setae, anteroventral setae nearly 
twice longer than posteroventral setae. Mid femur with 
4-5 posteroventral setae, nearly as long as width of femur; 
anteroventral row of short, spine-like setae along entire 
length. Mid tibia lacking distinct erect setae. Mid tarsomere 
1 lacking distinct setae. Hind femur with erect dorsal setae; 
1 preapical anterior, 2-3 preapical anteroventral setae. Hind 
tibia with 1 stout preapical anteroventral seta. Hind tarsomere 
1 with biserial row of ventral setae. Tarsomeres of hindleg 
much longer than tibia; ventral apical margin of tarsomere 
4 of fore and midlegs not flattened and expanded; tarsomere 
4 of hindleg not laterally compressed ventrally; tarsomere 5 
of each leg lacking dorsoapical extension. 
Wing. Reduced to halter-like appendage; concolorous with 
thorax. Halter absent. 
Abdomen. Tergites and sternites with short, sparse setae; 
marginal setae not lengthened. T8 broad, more than half 
length of T7; setae similar to preceding segments. 
Terminalia (Fig. 10). Cercus divided into subrectangular, 
thinly sclerotized anterior section, bearing short setae; 
posterior cercus broadly sclerotized medially, with apical 
row of peg-like setae on either side of distinct median notch. 
Epandrium small, oval; lamellae separated dorsally beneath 
cercus by wide membranous gap. Surstylus short, broad and 
