22 . H. C. EFFLATOUN. 



obviously placée! before the middle of cell M2, seems to exclude the 

 possibility of any relationship between thèse gênera. 



The larvse undoiibtedly feed on Aphides. I bave caught P. 

 tibialis and its two well known varieties hovering over Sonchus in 

 the Marient District. Mr. F. A. Willcocks bas bred the larvae of 

 P œgyijtius on A2MS gossifpii and Hijalopferits pruni on Apricot 

 in Ghezireb. 



5FA'0A}M/F.— This genus was established by Latreille in 1804 

 for Mulio bicolor of Fabricins and Verrall states that there bas 

 never arisen a doubt aljont the svnonyniy or limits of tlie genus. 



TABLE OF EGYPTIAN SPËCIES. 



1 (2) Face with a black middle lines in both sexes ; 



scuteîiuin entirely l)h\ek in both sexes (PI. I, 



jig. (i), 1 tibialis Fall. 



2 (1) Face entirely wbitish-yellow or yellow in both 



sexes; scntelluni with the tip or often the 



lower half yellow in both sexes (PU, fig.5) • 2 aegyptius Macq. 



1. P. TIBIALIS FALL. (PI. HT, figs. 2, 3, 4). 



Fall., Dipt. Suée. Svrph., 60.5, pp. (Pipiza) (1817) ; Meig., 

 System. Beschreib., III. 183.13. (1822); Macq., Rec. Soc. Sci. Lille, 

 1828.187.6. (1829) et Suit, à Buff., I. 567.14. (1834) ; Zett., Ins. 

 Lapp., Dipt., 618.2. (1838) et Dipt. Scand., IL 852.6 (1843) ; 

 ScHUMM., Ubers. d. Arb. u. Verand. d. scbles. Ges. f. vaterl. Kultur, 

 1842.164. (1842); Zett., Dipt. Scand., VIII. 3188.6. (1849); Lw., 

 Verh. zool.-bot. Ver. Wien, VIL 80.30. (1851) et Dipterenf. 

 Sudafr., 294. (366) (1860); Schin., Verh. zool.-bot. Ver. Wien, VIL 

 303.8. (1857), Fauna Austr., Dipt., I. 257.1. (1862) et Nov. Reise, 

 Dipt., 339.103. (1868); Bonds., Fini, tvaving. Ins., I. 284.3. (1861); 

 Walk., List Dipt. Brit. Mus., III. 544. (1849) ; Malm., Gœteb. 

 Kongl. Vet. Handl., 70. (1863); WiLLiST., Bull. Unit. Stat. Nat. 

 Mus., (31), 19. t. I; f. 8. (1886); Neuhaus, Dipt. Marchica, 90. 2. 

 (1886); Strobl, Mittheil. Naturwiss. Ver. Steiermark, XXIX. 

 1892.197. (1893); SNOw^ Kansas Univ. Quart., III. 227. (1895); 

 TowNS., Psvche, VIII. 140. (1897); Verr., Brit. FI., VIII. 150.1. f. 



