198 
PACIFIC SCIENCE, Vol. XII, July, 1958 
0. 6 mm. 
c 
Fig. 9- Plecia dubia Edwards, a, Ninth sternum; b, 
ninth tergum; c, accessory structure of aedeagus, 
end view. 
dorsal surface very densely black pilose (Fig. 
9 b). The claspers are short and broad, slightly 
pointed apically. The ninth sternum is ap- 
proximately three times wider than long, not 
distinctly lobate on hind margin (Fig. 9 a). 
The aedeagus has a pair of heavily sclerotized 
rather rodlike accessory structures, each of 
these possess a small sharp pointed sub- 
apical ventral lobe and a long dorsal lobe is 
developed, these are visible only in end view 
(Fig. 9c). 
Front of female with a strong black tubercle 
in middle at lower margin but with no ridge 
down the middle. 
Length: Body, 3. 5-6.0 mm.; wings, 4.0- 
7.5 mm. 
type locality: Singapore. 
Type in British Museum (Natural History). 
I have studied the type and a series of speci- 
mens from Borneo, 1903 (R. Shelford), and 
Samarang, Java, Aug. 1909 (E. Jacobson), 
which appear to belong here. 
Plecia erebea Skuse 
Fig. 10 a-c 
Plecia erehea Skuse, 1889, Linn. Soc. N. S. 
Wales, Proc. (2)3: 1375. 
This is the only all dark-colored Plecia 
known from Australia. It is distinguished from 
the other members of this complex from 
other areas by the characteristics of the male 
genitalia (Fig. 10 a-c). 
male: Entirely brownish black to black, all 
pile black, dense on abdomen and legs. Eyes 
bare, ocellar tubercle prominent. Antennae 
10-segmented, counting the small nipplelike 
apices. Thorax subshining with a faint brown- 
ish tinge in the ground color. Dorsum sparsely 
Fig. 10. Plecia erebea Skuse. a, Ninth sternum; b, 
clasper, lateral view; c, ninth tergum. 
