22 SYRPHID E#. 
on Nilimandjaro Diptera (1910); in my recent paper on the 
Diptera collected by Leonardo Fea in West Africa *, I have given 
a table of the known African species and forms, and have entirely 
confirmed my previous conclusions. 
The present collection contains 22 specimens belonging to this 
genus, which also bear out the opinions that I have expressed. All 
the known African species and forms are represented, with the 
exception of angustata, Becker, which is distinct from any other 
in having the eyes of the male separated—-a very striking character, 
unique in the genus; besides there are some new species and forms, 
one of which is unusually interesting on account of its hairy eyes. 
v 5 
The species and forms may be distinguished as follows :— 
1 (14) Face wholly yellow, without median black 
stripe and without any black spot upon 
front edge of buccal cavity; the face not 
conically produced, being less prominent 
below, and having the anterior edges of 
the buceal cavity retreating; facial tu- 
bercle cariniform ; peristoma narrow, 
with the hind part black, or at least with 
a black spot below the inferior corner of 
the eyes; frons usually with a prominent 
supra-antennal tubercle ; antenne closely 
approximate at the base. with the two 
basal joints of equal length and with the 
third mainly yellow, darkened only on 
the superior part ; proboscis rather short ; 
sides of the thorax and pleuree more 
or less distinctly yellow or yellowish 
(ericetorum-group). 
2 (18) Frons more er less prominent, usually with 
a well-developed supra-antennal tubercle ; 
eyes of male touching along a line of 
about 1 mm. in length; abdomen ovate, 
broader than the thorax; scutellum 
wholly black-haired, or at least with 
black hairs on the hind border; tarsi 
entirely black or with only a small yellow 
area near the base; species of greater size 
(11 to 15 mm.), 
8 (12) Frons clothed with black hairs in both sexes, 
rather prominent, with a well-developed 
and prominent supra-antennal tubercle, 
which besides usually bears a more or 
less distinct black spot; wings long. 
4 (11) Sides of face covered with a dull yellowish 
tomentum and clothed with dark yellow- 
ish hairs. 
5 (8) First abdominal segment with a very small 
black spot, which is much smaller than 
the scutellum; first yellow abdominal 

* “ Ditteri raccolti da Leonardo Fea durante il suo viaggio nell’ Africa 
occidentale,’ Ann. Mus, Civ, Stor. Nat. Genova, (3) v. pp. 400-443 (1912), 
