.1 Monograph of Egyptian Diptera. 1/ 



TABLE OF NORTH AFRICAN GENERA. 



1 (40) Antennae moderate in length and more 



or less drooping, never placed on a 

 produced irons. 



2 (29) Radio-median cross-vein placed before 



the middle of cell M2 (SYRPHIN^E). 



3 (6) Face flat or retreating, without a 



central knob; eyes and face always 

 hairy; thorax always dark and face 

 always black. 



* 



4 (5) Face with the upper mouth edge con- 

 spicuously produced 1 Psilota. 



ft (4) Face without even the upper mouth 

 edge produced; frons of female with 

 grey side dust spots 2 Pipiza.* 



6 (3) Face with a central knob or a cone-like 



snout. 



7 (8) Face arched and not hollowed beneath 



the frontal prominence and always 

 partly or wholly yellow (PL I, figs. 

 5, 6, 7) 3 Paragtjs. 



8 (7) Face hollowed below the antenna' and 



produced again to a central knob or 

 upper mouth edge or to both. 



9 (12) Entirely dark species without any pale 



markings except on the legs and beneath 

 the third joint of the antennae 



10 (11) Metallic coloured species; no eye- 

 margins; outer top angles of both cells 

 R5and M2 approximating right angles; 

 eyes always bare 4 Chrysogaster* 



*So far not represented in Egypt. 



