raosENA. 93 



Subfamily 3. DEXIDES. 



Sfomo.vi/d(e]). ,Me']g. Dma/v^p., Mcq.; Meig. Stomoxi/detsip.,West\v. 

 Tacldnarlce p., Westw. 



Arista pubescens, ant pl/anosa. Tliorax bnvis. Alul(e magna. Pedes 



longi. 

 Arista pubescent, or plumose. Thorax short. Alulce large. Legs 



long. 



The Dexides might cease to be considered as a subfamily, for 

 part of the species therein seem to belong to the Tach'mides, and 

 the rest to the Musc'ides. 



a. Proboscis long, geniculate at the base. Prosena. 

 a a. Proboscis sbort. Dexia. 



Genus I. PROSENA. 



Prosena, St. Farg. et Ser. Enc. Mctb. (1830). Westvv. ; Mcq. ; 

 Meig. Zw. vii. Stomoxys p., F. ; Gmel. ; Latr. ; Pz. 



Corpus magnum, subcylindricum, pubescens, setosum, opacum. Oculi 



mediocres, oblongi, in utroque sexu remoti. Proboscis longa, por- 



recta, basi geniculata. Palpi parvi, breves, clavati, pilosuli. 



Body large, nearly cylindrical, pubescent, bristly, dull. Eyes of 



moderate size, oblong, remote in both sexes. Proboscis long, porrect, 



geniculated at the base. Pulpi small, short, clavate, somewhat pilose. 



1. siberita, F. S. I. ii. 467. 3 (1781) ; Gmel. ; Fal. ; Latr. ; Meig. 

 — grisea, F. — lo)igipes, Gmel. — irritans, Pz. ! Fn. v. 24. Nigra, ci- 

 nereo-tomentosa, capite testaceo albo-tomentoso, frontallbus luteis, an- 

 tennis pedibusque testaceis, alis subcinercis, tarsis nigris ; Has, ab- 

 dominis lateribus testaceis. Long. 4 ^ ; alar. 9 lin. 



Black. Head testaceous, with shining white tomentum; frontalia 

 pale luteous, widening in front, with bristles along each side ; facialia 

 bristly along the whole length ; epistoma shgbtly prominent. Pro- 

 boscis black, testaceous towards the base. Palpi testaceons. An- 

 tennfE testaceous, not nearly reaching the epistoma ; third joint linear, 

 rounded at the tip, about thrice the length of the second; sixth j)lu- 

 mosc, with long hairs, very much longer than the tliird. Thorax with 

 four very slender interrujited black stripes. Wings pale grey ; veins 

 testaceous ; costal vein ending at a little in front of the tip of the 

 wing, with a spine by the tip of the subcostal ; subcostal vein ending 

 at a little beyond one-third of the leugtli ; mediastinal vein cmHng 

 at rather bcvond hall' tlie Icngih ; radial vein ending at about fiur-lifths 



