TABANIDiE. 51 



are found attached to the stem of plants or on leaves, those of 

 the aquatic forms are found attached to rushes. The larvae 

 are carnivorous, feedintjf upon snails, other larvge, etc. They 

 have a distinct head. The body is eleven-jointed, often 

 encircled with retractile fleshy protuberances, sometimes de- 

 veloped only on the ventral side, the last segment with a ver- 

 tical breathing opening, or the last two segments forming a 

 stigmatic tube. Pupa free, living in the earth or in M^ater. 



TABLE OF GENERA. 



1. Hind tibi<E with spurs at tho tip, sometimes small {Paiujonina). . 2 

 Hind tibiaj without spurs {Talianliur). ...... 7 



2. Third joint of tlie antenna> composed of eight annuli, the first of which 



is only a little longer than the following ones. . . . . o 



Third joint composed of five, annuli, the first of wliich is much longer 



than the following ones ; ocelli present. ..... 



'i. Front of female broad, with a large denuded callus; ocelli present. 5 

 Front of female narrow, ocelli present or absent 4 



4. First and fourth posterior cells closed (Central and South America). 



Dici.iSA Schiner. 

 Fourth posterior cell, at least, open. . . *Pangonia Latreille. 



5. Eyes acutely angulated above; Ilippoboscid-like species. 



GoNioPS Aldrich. 

 Eyes not acutely angulated above; not llippoboscid-like. 



Apatolestp:s Williston. 



6. Second joint of the antenna^ about half as long as the first; eyes in life 



witli numerous small dots. .... Silvius Meigen. 



Second joint of the antennie as long or but little shorter than the first 



joint ; wings with a dark i)icture : eyes in life with fewer, larger 



spots CiiRYSops Meigen. 



7. Third joint of tlie antenna; without,, or with a rudimentary) basal pro- 



cess. ............ 8 



Third joint of antennae with a well-developed basal process. . 10 



8. Thorax and abdomen with iriidescent tomentum ; all the tibia; dilated 



(Central and South America and West Indies). IIadiujs I'erty. 

 Thorax and abdomen without tomentum 9 



* Inclusive of Con'xnnrurti and I )i<it<nnincnra Rondani. 



