Plecia — Hardy 
211 
Length: Body, 5. 0-6.0 mm.; wings, 6.0- 
7.0 mm. 
type locality: Cairns, Queensland. 
Type in the Macleay Museum, Sydney. 
I have seen specimens from Australia, in 
the British Museum, which had been de- 
termined by Dr. F. W. Edwards. 
Plecia palauensis Hardy 
Plecia palauensis Hardy, 1956, Insects of Micro- 
nesia Diptera: Bibionidae and Scatopsidae 
12(2): 88, fig. la-d. 
This is a dark-brown to black species but 
the genital characters show relationship to 
P. javensis Edwards (with the thorax entirely 
rufous) . As in javensis the claspers are joined 
by a narrow sclerotized bridge, the ninth 
sternum is very broad, the median portion of 
the sternum is narrow, and the posterior lat- 
eral margins are acutely pointed (fig. 4, 
Hardy, 1952, Beitr. z. Ent. 2(4-5): 431). It 
differs from javensis and from other known 
Fig. 21. Plecia ornaticornis Skuse. a, Ninth sternum; 
b, ninth tergum. 
Plecia by the details of the male genitalia (as 
shown in Hardy, 1956, loc. cit ., fig. 1c, d) and 
as described below; by the dark coloration; by 
the 6-segmented flagellum of the male an- 
tenna (rather than 8); also by the normally 
developed ocellar triangle, not greatly reduced 
as in javensis. 
male: Predominantly opaque brown to 
black, bases of halteres yellow. A moderately 
deep furrow is present down each dorsocen- 
tral line and a faint indication of a median fur- 
row is present on the anterior half of the 
mesonotum. The wings are evenly fumose and 
vein R 2+ 3 is almost vertical in position. The 
ninth tergum is deeply cleft, almost to its 
base, on the hind margin; the lateral lobes are 
gradually tapered and obtuse at apices {loc. 
cit., fig. lc). The posterior lateral margin of 
the ninth sternum is produced into rather 
elongate, slender lobes which extend beyond 
the apices of the claspers; through the median 
portion the sternum is very narrow, measured 
longitudinally it is less than half as long as a 
clasper. The claspers are simple, obtuse at 
apices, with a partially developed secondary 
lobe on the lateral margins, and with a narrow 
sclerotized bridge connecting them on their 
inner anterior margins {loc. cit., fig. Id). For 
further details refer to the original. 
Length: Body, 3. 0-3. 8 mm.; wings, 3.8- 
4.5 mm. 
Female unknown. 
type locality: Garakayo Is., Palau Islands. 
It is known only from the Palau Islands, 
Eastern Caroline Islands. 
Type in the Bernice P. Bishop Museum. 
Plecia parva Malloch 
Fig. 22 a-c 
Plecia parva Malloch, 1928, Linn. Soc. N. S. 
Wales, Proc. 53: 606. 
A rather small species in the group of 
species which have the mesonotum chiefly 
rufous and the pleura brown to black. It is 
distinguished from all other known species of 
Plecia by the peculiar development of the male 
