218 
PACIFIC SCIENCE, Vol. XII, July, 1958 
Fig. 29- Plecia truths an der Wulp. a, Ninth tergum; b , ninth sternum; c, inner lateral view of right clasper. 
tinguished from other Plecia by the male 
genital characters. The thorax is grayish on 
pleura and margins of mesonotum, also down 
the furrows; the areas marked off by the fur- 
rows are faintly subshining black. The wings 
are faint yellow-brown fumose. Vein R 2+3 is 
straight and oblique and forms about a 45° 
angle with vein R4+5. The ninth tergum is 
deeply concave on the hind margin and the 
lateral lobes are well developed (Fig. 29^). 
The ninth sternum has a long fingerlike pro- 
jection from the posterior median margin ex- 
tending nearly to apices of claspers. The pos- 
terior lateral margins of the sternum are de- 
veloped into a pair of sharp pointed lobes 
which extend beyond the claspers (Fig. 29b). 
From a direct ventral view the clasper appears 
blunt and rounded at the apex. As seen from a 
lateral view (Fig. 29 c) a pair of dorsally 
projected lobes are developed. 
Length: Body, 4.0 mm.; wings, 5.0 mm. 
I have studied one specimen from Goen- 
ceng Cedah, Java, Mar. 1911 (Leiden Mus.). 
type locality : Mount Ardjoeno, East Java. 
The type is supposed to be in the Rijks- 
museum van Natuurlijke Historic, Leiden, 
Holland, but I was unable to find it when I 
visited the Museum in August 1954. None of 
van der Wulp’s specimens seemed to be desig- 
nated and I doubt that the type of P. tristis is 
still extant. 
Plecia varians Edwards 
Fig. 30^, b 
Plecia varians Edwards, 1928, Jour. Fed. Malay 
States Mus. 14: 43. 
The original description consists of only 
two lines saying that the species "closely re- 
sembles P. subvarians , differing only in the 
male hypopygium, especially in the shape of 
the claspers," plus a figure from a dorsal view. 
Edwards’ figure is not clear, the claspers are 
not differentiated from the sternum. It is 
probable that Edwards mistook the curved 
lateral lobes of the sternum for claspers, the 
claspers themselves are not distinctive, but the 
lobes of the sternum will separate it from 
related species. 
Antennae of male 9-segmented, including 
the nipplelike tip; the female antennae are 10- 
segmented. These are all black in the male and 
tinged with yellow on the first two segments 
in the female. The front of the female has a 
predominent orange colored tubercle and a 
moderately distinct ridge down the middle. 
Thorax entirely orange to rufous. Legs dark 
colored, segments all slender. Wings light 
brown fumose. Vein R 2+3 straight, forming a 
75° angle with R 4+5 . Petiole of cell Mi two 
times longer than r-m cross vein. Cubital cell 
just slightly narrowed in the male, more 
strongly narrowed in the female. Ninth tergum 
