214 
PACIFIC SCIENCE, Vol. XII, July, 1958 
Type in the British Museum (Natural 
History). 
Plecia subvarians Walker 
Fig. 25 a, b 
Plecia subvarians Walker, 1857, Linn. Soc. 
London, Proc. 1: 105. 
This species fits in the fulvicollis complex by 
having the thorax entirely opaque orange to 
rufous. It is closest related to P. siamensis 
Hardy and is distinguished by the male genital 
characters. The ninth tergum is much stronger 
and extends to or beyond the apices of the 
sternum and the cleft in the middle of the 
hind margin of the tergum is broadly V-shaped 
and about one-third as wide as the segment 
(Fig. 25a). The submedian lobes on the hind 
margin of the sternum are pointed on the in- 
ner side just below the apices and are separated 
by a cleft which is sometimes expanded at the 
Fig. 25. Plecia subvarians Walker, a , Ninth tergum; 
b , ninth sternum. 
bottom (Fig. 25 b). In siamensis the median 
cleft on the ninth tergum is rather narrow, the 
submedian lobes of the sternum are rounded 
and are separated by a U-shaped cleft. The 
posterior lateral lobes of sternum are slender, 
very slightly curved and the claspers are broad 
and blunt. 
The male antennae possess 9 segments and 
the female 11. The wings are light brown 
fumose, darker along the costal margin. Vein 
R 2+3 is bent rather sharply at base and enters 
the costa at about a 55° angle to vein R 4+5 . 
The petiole of cell M 4 is one-half longer than 
the r-m cross vein. Vein Cu 4 is bent sharply 
downward near the apex, the apical portion of 
the cubital cell is about equal to the length of 
the m-cu cross vein. 
Length: Body, 5. 5-6.0 mm.; wings, 6.5- 
7.0 mm. 
type locality: Sarawak, Borneo. 
Type in the British Museum (Natural 
History). 
It has been recorded from Sumatra, Java, 
Ceram, and Singapore. Brunetti (1912, Fauna 
of Brit. India, Diptera Nematocera, p. 163) 
recorded subvarians from India as a synonym 
of P. fulvicollis (Fabricius), this is an error. I 
have seen the type and other specimens from 
Borneo. 
Plecia sundaensis Hardy 
Plecia sundaensis Hardy, 1952, Beitr. z. Ent. 
2(4-5): 432-434, fig. 5a, b. 
This species is related to P. subvarians 
Walker and to P. siamensis Hardy because of 
the development of the male genitalia. It is 
readily differentiated by the very deep, broad 
cleft on the hind margin and by the sharp 
pointed lateral lobes of the ninth tergum ( loc . 
cit ., fig. 5a); by the more evenly tapered, 
sharp pointed lateral lobes and by the more 
slender submedian lobes of the ninth sternum 
{loc. cit., fig. 5b). Also the hypopleura of 
sundaensis are brown to black and a small 
brown spot is present on the upper portion of 
each mesopleuron; rather than the pleura be- 
