2.2i SYRPHIDjE. 



on Kilimandjaro 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. 



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 fare not 

 conically produced, being' less prominent 

 below, and having the anterior edges of 

 the buccal 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 ; antennae 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 pleurae more 

 or less distinctly yellow or yellowish 

 (ericetorum-group). 



2 (13) Frons more or 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.). 



3 (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 



toraentum and clothed with dark yellow- 

 ish hairs. 



6 (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 

 ocoidentale," Ann. Mus. Civ. Stor. Nat. Geneva, (3) v. pp. 400-443 (1912). 



