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XIX. Notes on some Syrphidx collected near Aden by 
Colonel J. W. Yerbury in February and March, 
1895. By Grorce Henry VERRALL, F.ES. 
[Read October 5th, 1898. ] 
SoME very interesting species of Syrphidx were collected 
near Aden by Col. J. W. Yerbury in the early part of 
1895, and although he has succeeded in identifying 
almost all of them, he has asked me to publish an account 
of them. 
There are fifteen species in the collection, and I shall as 
far as possible use Col. Yerbury’s own notes, which I place 
in Inverted commas. 
1. Paragus serratus, Fabr. 
“Very common throughout the neighbourhood—in 
Ceylon too it may be considered the commonest and 
most generally distributed Syrphid found in the island.” 
This species varies considerably in coloration, like most 
species of Paragus. Col. Yerbury’s nine specimens are 
all males, some of which have blackish markings on the 
dise of the third abdominal segment, and also have the 
hindmargin of the fourth segment broadly black, as well 
as all the genitalia. The middle black line down the face 
is sometimes not very distinct. The grey lines on the 
front part of the thorax distinctly diverge. 
2. Paragus longiwentris, 
Loew, Dipt. Sud.-Afr., p. 295. 
“Uncommon; only three specimens, Lahej and Hait- 
halhim, March, 1895.” 
This species is easily distinguished by the shape of its 
abdomen. Loew described it from Kaffraria, and therefore 
it probably occurs on all the East African coast. The 
pubescence on the eyes is so slight that it is not easily 
detected, but the microscopical pubescence on the wings 
extends over the whole of the wings, except on the basal 
cells. 
TRANS. ENT, SOC. LOND. 1898.—PART IV. (DEC.) 28 
