Plecia — Hardy 
187 
16. Lobes of ninth tergum ending in a strong 
apical spine. Posterior lateral margins of 
ninth sternum developed into slender 
lobes (Fig. lid). (New Guinea) 
magnispina n.sp. 
Lobes of tergum not bearing an apical 
spine. Posterior lateral margins of ster- 
num not developed as above (Fig. 5). 
(New Guinea) decora Hardy 
17. Thorax all rufous (except for a brown to 
black spot on upper portion of pleura in 
sundaensis Hardy) 18 
Pleura predominantly brown to black . 3 3 
18. Ninth tergum and sternum fused on the 
sides and forming a capsule around the 
internal genital structures. The claspers 
and the structure of the sternum cannot 
be seen except in end view (Fig. 22a). 
(Philippine Islands). . . . parva Malloch 
Genital sclerites not fused. Claspers and 
other structures exposed 19 
19. Ninth tergum not strongly produced at 
apices, not extending beyond sternum or 
tips of claspers 20 
Ninth tergum strongly lobate, extending 
two times the length of sternum (Fig. 
lib). (Indonesia, Indian Ocean) (some 
specimens may run here) . 
forcipata Osten Sacken 
20. Ninth tergum gently concave on hind 
margin, the concavity extending not over 
one-half to base of segment (Fig. 16c). 
(Java) lieftincki n.sp. 
Ninth tergum deeply cleft, nearly to base 
of segment. 21 
21. Ninth sternum with a pair of submedian 
sharp-pointed lobes, equal in length to 
remainder of sternum (measured on a 
median line) and extending nearly to 
apices of claspers. Also a narrow-pointed 
median lobe present (Fig. 28^). Lateral 
margins of sternum not produced. (Wet- 
ter Island, Indonesia). . . . tridens n.sp. 
Not as above 22 
22. Lateral lobes on hind margin of sternum 
narrow, strongly curved inward; median 
portion with a cleft which is expanded 
basally (Fig. 30 b). (Malaya) 
varians Edwards 
Lateral lobes not curved as above and 
sometimes with a slightly expanded 
median cleft only in subvarians Walker. 
23 
23. Ninth sternum very broad and narrow, at 
least two times broader than long. 
Claspers joined at bases, equal in length 
or longer than ninth sternum, measured 
through median portion of sternum. .24 
Ninth sternum as long as wide. Claspers 
much shorter than sternum. 26 
24. Claspers blunt, broadly rounded at apices 
(Fig. 8£). (Ceylon and India) ......... 
dispersa n. name (for thoracica Guerin) 
Claspers narrowed apically 2 5 
25. Posterior lateral margins of ninth ster- 
num produced into pointed lobes. Pos- 
terior lateral margins of ninth tergum 
produced. Ocellar triangle tiny in male, 
the entire triangle is equal to only 3-4 eye 
facets. (East Indies) . . javensis Edwards 
Posterior lateral margins of ninth ster- 
num and ninth tergum not so produced 
(Fig. la, c ). Ocellar triangle normal, each 
lateral facet equal to about 3 compound 
eye facets in length. (Australia, New 
Hebrides, Papua, Solomon Islands) .... 
. amplipennis Skuse 
26. Lobes on posterior lateral margins of 
sternum slender stemmed, enlarged at 
apices. (Philippine Islands) . 
mayoensis Hardy 
Lobes of sternum not capitate 2 7 
