190 
PACIFIC SCIENCE, Vol. XII, July, 1958 
46. Ninth sternum but slightly broader than 
long, hind margin not noticeably con- 
cave and with a pair of tiny median lobes. 
(Burn Island) buruensis Edwards 
Ninth sternum much wider than long, 
concave on hind margin and with no 
lobes in middle 47 
47. Posterior lateral margins of ninth ster- 
num drawn to a sharp point (Fig. 21 d). 
Claspers, seen in end view, bilobed at 
apex (Fig. 27b). (Sumatra, Java) 
tergorata Rondani 
Ninth sternum rounded on posterior lat- 
eral margins. Claspers not bilobed. . .48 
48. Claspers acutely pointed at apices. Aede- 
agus with well-developed rodlike acces- 
sory structures extending to tips of 
claspers, these have two additional basal 
lobes (Fig. 9a). (Malaya, Borneo) 
dubia Edwards 
Claspers rounded at apices. Accessory 
structure not so developed. (Java) .... 
tjibodensis Edwards 
Plecia amplipennis Skuse 
Fig. 1 a-c 
'Plecia amplipennis Skuse, 1888, Linn. Soc. N. S. 
Wales, Proc. (2)3: 1372. 
Skuse later (1891, Linn. Soc. N. S. Wales, 
Proc. (2)5: 635) considered P. amplipennis as a 
synonym of P. fulvicollis Fabricius, but I be- 
lieve it is quite obvious that he was wrong. 
P. amplipennis agrees with fulvicollis only in 
having the thorax entirely rufous. The male 
genitalia are distinctly different, refer to Fig- 
ures 1 a and 13^. The broad rounded lobes of 
the ninth tergum are very densely black haired 
(Fig. 1 c). The clasping structures are acutely 
pointed at apices and are joined together at 
bases by a sclerotized bridge. The ninth 
sternum is two times broader than long and 
the aedeagus has a pair of rodlike accessory 
structures (Fig. la). 
The female specimens are very similar to 
those of fulvicollis Fabricius and aruensis Ed- 
wards except that the antennae are entirely 
dark brown to black. The female antennae are 
11 -segmented. The front has a prominent 
longitudinal ridge extending from the ocelli 
to antennae, this is entirely black; in aruensis 
the lower part is yellowish. 
Length: Body, 6.0-8. 5 mm.; wings, 7.0- 
9.5 mm. 
The species was described from Queens- 
land, Australia. I have studied specimens from 
numerous localities in Queensland, New 
Elebrides, Java, Papua, New Guinea, and the 
Solomon Islands. The specimens from areas 
outside of Queensland have been just slightly 
smaller and the claspers of the male are not 
so slenderly pointed as in the typical form 
(Fig. la, b). This was also pointed out by 
Hennig (1940, Arb. fiber Morph, u. Taxonom. 
Fig. 1. Plecia amplipennis Skuse. a , Genitalia, ventral view; b, left clasper of typical amplipennis ; c, ninth tergum. 
