INTRODUCTION 



ROBBER FLIES OF THE WORLD 



19 



Text-Figure 7. — Concentration areas of asilid genera and subgenera. 



11 from Scotland and 1 from Ireland. Seguy (1927) 

 lists 133 species from France. Engel (1932) lists 82 

 Asilidae from Germany. Melin (1923) gives 25 species 

 from Sweden. Far northern localities are likely to 

 have their species totals increased by the abundance 

 of Oyrtopogon Loew and Laphria Meigen, abundant 

 at higher latitudes. Lundbeck (1908) lists 28 species 

 from Denmark. Efflatoun (1934, 1937) lists 88 species 

 from Egypt. 



The tabulation below attempts to show the extent of 

 the fauna Asilidae for the larger land masses. It in- 

 cludes all genera for each continent, for each northern 

 segment above the Tropic of Cancer and treated col- 

 lectively it shows the total genera for each vertical land 

 conglomerate such as North and South America, 

 Europe and Africa, and Asia with the Indo-Malayan, 

 Papuan, and Australian regions. These areas yield 

 some interesting, distributional facts. Most of the 

 subgenera have been omitted from the totals of genera 

 given below. 



NUMBER OF GENERA KNOWN FROM VARIOUS AREAS 

 WESTERN HEMISPHERE 



Nearctic region only 39 



Nearctic region and In Europe, or Asia, or both 13 



Nearctic region and in Africa 1 



WESTERN HEMISPHERE — CONTINUED 



Nearctic region and having a nearly world-wide dis- 10 



tribution 



Nearctic region and in Central America 3 



Nearctic region and in South America 16 



Total occurring in the Nearctic region 82 



Central America only 5 



South America only 105 



South America and in Africa 4 



Total occurring in Western Hemisphere 196 

 South America, including those shared with North 125 



America and with Africa 



Nearctic region above Tropic of Cancer 66 



Below Tropic of Cancer 141 



EUROPE AND AFRICA 



Europe only 8 



Palaearctic region and predominant there 8 



Holarctic region 11 



World-wide, including Europe 8 



Transcaucasus and Europe 1 



North Africa and Europe 8 



Total occurring in Europe 44 



South Africa and Central Africa 47 



South Africa and also in Holarctic region 7 



Africa 103 



Euro-African land mass 122 



Above Tropic of Cancer 52 



Below Tropic of Cancer 80 



