230 TABANID.E [CH. 



winter and only pupates the following spring, but in Egypt 

 King was able to rear T. par, from the freshly hatched larvae to 

 adults, in three and a half months. The pupal stage is usually 

 completed in three to four weeks, and as the whole development 

 generally takes about eleven months, the duration of the larval 

 stage is very considerable. In some cases it probably takes 

 more than one year for its development. When fully grown 

 the larva buries itself in the sand, or earth, in its immediate 

 neighbourhood, and then pupates. 



Classification. The following synopsis of the genera of 

 Tabanidae is taken from Miss Ricardo's Revision of the Family ; 

 the more important genera, which have a world-wide distribu- 

 tion, are printed in capitals : 



Synopsis of Genera of Tabanidce. 



1. TABANIN^E. 

 Ocelli absent ; hind tibiae not spurred. 



f Third antennal segment composed of four subsegments or rings, and 



1 { not angulated or spurred at base =2 



I Third antennal segment composed of five subsegments or rings = 5 

 f Rings so distinct that the antenna appears to consist of six segments 



2 ^ Hexatoma Meigen (Europe). 



L Rings not so distinct as to modify the appearance of the antenna = 3 

 f Wings with a profusion of ring-like and scroll-like markings 



3 { H^EMATOPOTA. 



L Wings without circles and scrolls . . . . . . ... . . = 4 



f First and second antennal segments pubescent in the male, third segment 



4 { longer than the first ; eyes hairy 



Dasybasis Macquart (Chili and Australia), 

 f First antennal segment globose, situated on a frontal protuberance 



5 \ Bolbodimyia, Bigot (Venezuela). 



I First antennal segment not globose . . . . . . . . = 6 



/Third antennal segment not angulated or toothed at base . . = 7 

 \Third antennal segment angulated or toothed at base . . . . =9 



f Body covered with metallic scales 



Lepidoselasa Macquart (South America). 



7 { Body metallic in colouring Selasoma Macquart (South America) 



I Body not in any way metallic ; first antennal segment longer than is 

 L usual in Tabanus ; wings commonly with brown markings = 8 

 f Antennae long, the third segment cylindrical, and situated on a pro- 



8 J jecting tubercle . . . . Udenocera Ricardo (Ceylon). 



I Antennas not as in Udenocera 



L Diachlorus Osten Sacken (America and Philippines). 



