on 
—T 
8 (11) 
9 (10) 
11 
(12) 
(7) 
(6 
(8 
) 
— 
MELANOSTOMA. 
Facial tubercle double, that is, divided 
by a perpendicular furrow into two 
small but distinct approximated 
tubercles; legs and antenne entirely 
yellow or sometimes more or less 
darkened ; yellow abdominal mark- 
ings very extensive, those of male 
sometimes covering the whole abdo- 
MeD Ky age eed. eel demwa.g aaah 
Facial tubercle simple, or rarely with 
only a trace of a division, 
Legs entirely yellow, without dark 
markings; yellow abdominal spots 
very broad, rectangular; larger 
Spacies (S-0 mma.) rasta h. eames. 
Legs for the most part not entirely 
yellow, often with a black pattern, 
or at least with dark markings; if 
the legs are entirely yellow, the 
abdominal spots are not so broad 
and of triangular shape. 
Legs mainly yellow, that is, the front 
femora not blackened at the base, 
the trochanters yellow, the hind 
femora and tibize only with black 
rings; autennz almost entirely 
yellow. 
Arista slightly pubescent; legs more 
or less darkened or wholly yellow, 
without any definite black rine 
before the apex of hind femora; 
abdomen of male very narrow; 
yellow abdomival spots of female 
triangular in shape, and longer than 
hall Tho SCCM OME. a5. mes oresarsgecs sve 
Arista bare; legs with sharply de- 
fined black rings on hind femora 
and tibize; abdomen of the male 
broader (annvulipes, s.1.). 
Second abdominal segment with a 
pair of yellow spots. 
Yellow spots on the second abdominal 
segment rectangular in shape and 
not different from those on the 
following two segments, which are 
besides longer than the half of each 
segment; hind tibize with a sharply 
defined black ring; hind tarsi yel- 
low, darkened apically .......... 
Yellow spots on the second abdominal 
segment rounded, and only half as 
large as the others, which besides 
are not longer than the half of the 
segment; hind tibie and hind tarsi 
sometimes entirely biack ........ 
Second abdominal segment wholly 
19 
bituberculatum, Loew. 
Jloripeta, Speis. 
scalare, Vabr. 
annulipes, Macq. 
var. automenes, Walk, 
