A Monograph of Egyptian Dip/era. 



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(>. PSEUDODOKOS BECK. 



Beck., Mitteil. Zool. Mus. Berl, II. 92. (1903). 



This genus is rather closely allied to the genus Baccha Fabr. 

 and still more so to the genera Doros Macq., and Spazigaster 

 Rond. It also possesses several characters in common with the 

 genus Syrphus, such as the venation of wings, and the head. The 

 body is practically identical to that of Doros whilst the legs re- 

 mind one of Baccha. 



Becker gives the following table in order to clearly exhibit 

 the characters of this interesting genus: — 



BACCHA 



DOROS 



PSRUDODOROS 



SPAZIGASTER 



(1) Sides of thorax de- 



void of hairs. 



(2) Third joint of an- 



tennae short and 

 oval 



(3) Arista bare, inser- 

 ted near the base. 



(i) Face not project- 

 ing. 



(5) Prominence of face 



wart-shaped 



(6) Abdomen stalk-fcha- 



ped, very slender. 



(7) Hind femora strai- 

 ght, without thick- 

 ening at base. 



Sides of thorax de- 

 void of hairs. 



Third joint of an- 

 tennae short and 

 oval. 



Arista bare, inser- 

 ted near the base. 



Sides 



of thorax 

 hairy. 



Sides of thorax de- 

 void of hairs. 



Third joint of an- Third joint of an- 

 tennas longish and tenna? short and 

 oval. oval. 



Arista bare inser- Arisla hairy, inser- 

 ted just before the ted near the base 

 middle. 



Face projecting. Face not projecting 



Prominence of face 

 wart-shaped. 



Abdomen robust, 

 club-shaped. 



Hind femora strai- 

 ght, with a slight 

 thickening at base 



Prominence of face 



nose-shaped as in 



Syrphus 



Abdomen club-sha- 

 ped but much more 

 slender than in Doros. 



Face a little pro- 

 jecting 



Prominence of face 



nose-shaped as in 



Syrphus 



Abdomen flattened 

 narrow at base 



Hind femora cur- Hind femora slen- 

 ved, without thick- der, straight, with- 

 ening at base out thickening at 



base 



1. P. NIGRICOLLIS BECK. (PI. VI, fig. 5). 



Beck., Mitteil. Zool. Mus. Berl., II. 92. 128. (1903). 



DESCRIPTION:— .Male: Face and frons yellowish-white ex- 

 cept for two fairly shining black spots at the base of the antennas, 

 which run down the centre of the face, and extend to the upper 

 mouth-edge; pubescence of face and frons uniformly pale, short ; 



