Plecia — Hardy 
217 
Plecia tjibodensis Edwards 
Plecia tjibodensis Edwards, 1927, Treubia9: 363, 
fig. c. 
A moderately small species belonging in 
the group of species which have the thorax 
rufous above and brown to black on the pleura. 
It seems most closely related to P. tergorata 
Rondani and dubia Edwards and is distinguish- 
ed by having a rather shallow cleft on the hind 
margin of the ninth tergum, extending about 
one- third the length of the segment; rather 
than the cleft extending nearly to its base. 
Also the claspers terminate in a slight point at 
their outer apices. From Edwards’ figure it ap- 
pears that the sternum is about three times 
wider than long, the posterior lateral margins 
are rounded and there is apparently no median 
lobe on hind margin. It appears that the 
aedeagus is rather well developed, extending 
nearly to apex of sternum and has a small 
accessory structure on each side. Refer to 
loc. cit ., figure c. 
Length: Body, 3. 5-4.0 mm.; wings, 5.0 mm. 
TYPE LOCALITY: Tjibodas, Java. 
Type in the British Museum (Natural 
History). 
I have not studied specimens of this species. 
Plecia tridens n. sp. 
Fig. 28^, b 
Fitting in the complex of species which 
have the thorax all rufous but with strikingly 
different genitalia from any of the known 
species (Fig. 28^, b). 
male. Head: Antennae brown, tinged with 
rufous on the basal segments; 9-segmented. 
Ocellar triangle well developed. Thorax: En- 
tirely opaque yellow-red except for a faint 
black streak at tip of scutellum. Stems of 
halteres yellow, knobs brown. Legs: Brown to 
black, tinged with rufous on the coxae and 
bases of femora; segments slender. Wings: 
Faintly brownish or yellowish fumose, darker 
along costal margin. Vein R 2+ 3 at about a 75° 
angle to R44-5. Abdomen and genitalia: Entirely 
dark brown to black. Ninth tergum cleft 
Fig. 28. Plecia tridens n. sp. a , Ninth tergum; b, 
ninth sternum. 
nearly to its base on the hind margin (Fig. 
28 a). Ninth sternum with a large, heavily 
sclerotized, three-pronged projection from the 
middle of the hind margin. Claspers large, 
heavily sclerotized, each with an acute sub- 
apical point, a well- developed basal lobe on 
inner margin, and lying directly behind the 
projected portion of the sternum (Fig. 28 b). 
Length: Body, 4.0 mm.; wings, 4.4 mm. 
Female unknown. 
Holotype male, Ins. Wetter, Netherlands 
Indies, Acq., 1896 (C. Schadler). 
Type returned to the Rijksmuseum van 
Natuurlijke Historie, Leiden. 
Plecia tristis van der Wulp 
Fig. l^a-c 
Plecia tristis van der Wulp, 1884, Notes Leyden 
Mus. 6: 251. 
One male in the Rijksmuseum van Natuur- 
lijke Historie, Leiden, from Java appears to be 
this species. It is a small, all-black species dis- 
