Plecia — Hardy 
193 
flagellum, the front tarsi of the male stout and 
somewhat flattened, and the ninth tergum 
developed into a pair of small lobes at apex, 
these are separated by a U-shaped deft (see 
Edwards, loc. tit., fig. 1). 
Length: Body and wings, 4-6 mm. 
Known only from the type taken at 
Bettotan, Borneo. 
Type in the British Museum (Natural 
History). 
Plecia hurmensis n. sp. 
Fig. 4 a, b 
Fitting in the impostor complex by having 
the pleura all black and the mesonotum ru- 
fous with a black spot in middle of the front 
margin. In my key to this group (Hardy, 
1953, Rec. Indian Mus. 50(1): 90) it runs in 
couplet 3 to malabarana Hardy and is very 
closely related to this species. It differs by 
having the lobes of the tergum curved in- 
ward, broad, truncate at apices, not tapered 
(best seen from lateral view), and the median 
cleft is more narrowly U-shaped; rather than 
the lobes being straight, evenly tapered to a 
subacute apex and the cleft broadly U-shaped. 
Also the posterior lateral margins of the ninth 
sternum are evenly tapered into a moderately 
large pointed lobe lying just outside each 
clasper and extending three-fourths the dis- 
tance to apex of clasper and the claspers are 
rather gently tapered to a subacute apex 
(Fig. 4a). In malabarana the posterior lateral 
margins of the sternum are just slightly ele- 
vated and a small inconspicuous lobe is 
present just outside each clasper, also the 
claspers are extended into a sharp pointed 
apical projection. 
male. Head: Antennae black, tinged with 
rufous on basal segments, 9-segmented. Ocel- 
lar tubercle large. Thorax: As stated above, the 
blackened portion covering the anterior fourth 
of the mesonotum. Halteres with yellow to 
rufous stems and brown to black knobs. Legs: 
Brown to black, segments slender. Wings: 
Faintly brownish fumose, stigma not darker 
Fig. 4. Plecia burmensis n. sp. a , Ninth sternum; b , 
ninth tergum. 
than the membrane. Vein R 2+3 at about a 50° 
angle to R 4 + 5 - Abdomen and genitalia: Entirely 
black with considerable gray pubescence on 
the dorsum. Genitalia as described above and 
as in Figure 4a, b. 
Length: Body, 3.3 mm.; wings, 3.9 mm. 
female: Fike the male except for sexual 
differences and except that the mesonotum is 
entirely rufous. Head densely gray pubescent, 
front raised down the median portion. Bases 
of femora yellowish tinged. 
Length: Body, 3-9 mm.; wings, 5.0 mm. 
Holotype male, allotype female, and two 
paratype females, Upper Burma, Nam Tamai 
Valley, Fat. N. 27° 42', Long. E. 97° 54', 3,000 
ft. elev., Aug. 1938 (R. Kaulback). 
Type and allotype returned to British Mu- 
seum (Natural History). One paratype each in 
the U. S. National Museum and the University 
of Hawaii collection. 
Plecia buruensis Edwards 
Plecia buruensis Edwards, 1926, Treubia 7: 135. 
This species fits near P. tjibodensis Edwards 
but the male genitalia are distinctive. It is 
best distinguished by the shape and develop- 
ment of the ninth sternum and clasping struc- 
tures as figured by Edwards (loc. tit., fig. 1). 
The sternum is but little wider than long, the 
hind margin is but slightly concave and has a 
pair of small median lobes. The claspers are 
short and broad and abruptly attenuated at 
apices. The ninth tergum is deeply cleft on 
hind margin. 
Length: Body, 7.0 mm.; wings, 8.0 mm. 
Known only from Burn Island. 
Type in the Zoologisch Museum, 
Amsterdam. 
