40 SYRPHID 2. 
straight ; thorax and scutellum entirely 
black ; : abdomen with distinct paired 
yellowish spots; third antennal joint 
very elongate..... efahe (oelel efolS) = AACE. aay) CUMIAMEL SP. o, 
16 (5) Face black, or at most with yellowish mar- 
gins to buceal cavity; thorax and scu- 
tellum always black; wings either entirely 
hyaline or evenly infuseated, without any 
broad yellow or brown pattern. 
17 (20) Wings hyaline, with a small brown apical 
spot at the end of the submarginal cell. 
18 (19) Pterostigma pale yellowish; eyes adorned 
with three dark ‘transverse bands; abdo- 
men black at base and reddish with black 
stripes on the broadened part; female 
with a rather long and flattened ovi- 
POSLEOT 4 Wee Shue Hh Piphers . wchneumonea, sp. Ni. 
19 (18) Pterostigma black ; eyes with ‘only a middle 
band ; abdomen w vholly black; female 
ovipositor not protruding.............. sapphirina, Wied. 
20 (17) Wings without defined brown apical spot, 
at most faintly infuscated at the extreme 
tip. 
21 (24) Abdomen with a long stalk, the second 
segment being cylind: ‘ical, and as long as 
or longer than the third. 
(23) Sides of buecal cavity black, like the rest 
of the face ; wings hyaline or faintly infus- 
cated, in the temale narrowly but dis- 
tinctly darkened at the tip; thorax grey- 
dusted ; antennze short and dark ...... preusta, sp. n. 
23 (22) Sides of buccal cavity yellowish; wings 
strongly infuscated, almost blackish along 
the fore border; thorax golden- dusted : 
antenn a little longer and p aler yellow.. margtnata, sp. n. 
24 (21) Abdomen with a short stalk, the second 
segment being shorter than the third, 
not cylindrical and constricted towards 
the middle; wings byaline, with dark 
stigmatic streak. 
25 (26) Antenne and legs mainly yellow ........  claripennis, Loew. 
26 (25) Antenne dark and legs mainly black...... brevis, Karsch. 
bo 
LS) 
54. Baccha conifrons, sp 
Q@. Length of body 11 mm., of wing 7 mm. 
A slender, elongate, Ichneumon- like : species, easily distinguished 
by the conical ocelliferous prominence on the frons, and by the 
proportionally short and very narrow wings, which lack the alula 
and axillary lobe. 
Frons dull velvety black, shining bluish on the prominent supra- 
antennal tubercle; there is a grey transverse band before the 
shining portion ; ocellar tuberele more prominent than the supra- 
antennal one, shining black and bare; frons clothed with short 
dark hair near the vertex and in the depression between the two 
