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PACIFIC SCIENCE, Vol. XII, July, 1958 
Fig. 16. Plecia lieftincki n. sp. a, Ninth sternum; b, 
clasper, lateral view; c, ninth tergum. 
claspers are quite differently shaped in the 
two species. 
male: A small species, belonging in the 
group which has the thorax entirely rufous. 
The halteres are brown, the bases are rufous. 
The scape and pedicel of the antenna are 
yellow-brown, the flagellum is brown. Legs: 
Entirely brown, all of the segments are mod- 
erately slender, not at all swollen. Wings: 
Faintly brown fumose, more distinctly so 
along the costa. Vein R 2 +3 straight, oblique in 
position forming about a 75° angle with R 4+5 . 
Abdomen: Entirely dark brown. Genitalia: The 
ninth tergum is about two times as wide as 
long and has a moderate concavity extending 
nearly half its length on the posterior margin 
(Fig. 16c). The ninth sternum is slightly wider 
than long and fits the characters given above 
and in Figure 16a. The claspers are but little 
longer than wide, are rounded at apex, and 
produced into a protuberance on inner margin 
as viewed from below. In lateral view each 
clasper is seen to terminate in a sharp upward 
curved point (Fig. 1Gb). 
Length: Body, 3.5 mm.; wings, 3.8 mm. 
female: As in the male except for genital 
and secondary sexual characters. The flagellum 
of the antenna is 8-segmented (the tip is 
broken in the male). 
Length: Body, 3.5 mm.; wings, 4.2 mm. 
Holotype male and allotype female: Base 
Biak, 2-VIII-1952, op licht (L. D. Brongersma 
and W. J. Roosdorp). 
Both have been returned to the Rijksmuseum 
van Natuurlijke Historie, Leiden, Holland. 
I take pleasure in naming the species after 
my friend, Dr. M. A. Lieftinck, who has made 
such outstanding contributions in the field of 
entomology in Indonesia. 
Plecia magnispina n. sp. 
Fig. 17 a, b 
Related to P. decora Hardy but differenti- 
ated by its smaller size and by the differently 
developed genitalia. The lobes of the ninth 
tergum of the male are more strongly con- 
Fig. 17. Plecia magnispina n. sp. a. Genitalia, ventral 
view; b, ninth tergum. 
