192 MUSCID^. 



Corpus oblongum, sublineare. Oculi rotundi. Antennarum articulus 

 tertius sublinearis, apice rotundatus ; xextus nudus. Alse sat angusta?. 

 Body oblong, nearly linear, with few hairs and bristles. Face flat, 

 bare. Peristoma small, round. Eyes round. Third joint of the an- 

 tennse nearly linear, rounded at the tip, more than twice the length of 

 the second ; sixth bare. Wings rather narrow. Costal vein ending 

 on the hind border near the tip ; subcostal a little shorter than the medi- 

 astinal, which ends a little beyond one-third of the length ; radial end- 

 ing very near the tip ; cubital and prabrachial parallel ; discal trans- 

 verse straight and upright, parted by more than twice its length from 

 the prsebrachial transverse, and by more than its length from the border. 

 Abdomen with five apparent segments, hardly longer than the thorax. 

 These flies inhabit herbage. 



1. aridella, Fal. Ochtid. 10. 2 (1820) ; Meig. ; Mcq. ; Zett. Cano- 

 tomentosa, alis limpidis, abdomine immaculate, tibiis flavis. Long. 1^ ; 

 alar. 3 lin. 



Black, with hoary tomentum. Wings limpid. Abdomen unspotted. 

 Legs yellow ; femora, except the tips, and tarsi towards the tips black. 

 Generally distributed. (E. S. I.) 



2. juncorum, Fal. Ochtid. 9. 1 (1820); Meig.! Zw. vi. pi. 59. 

 f. 11 ; Mcq. ; Zett. Cano-tomentosa, alis limpidis, abdomine e maculis 

 nigris bivittato, tibiis flavis. Long. 1 ; alar. 3 lin. 



Black, with hoary tomentum. Wings limpid. Abdomen with three 

 black spots on each side. Legs yellow ; femora, except the tips, and 

 tarsi towards the tips black. 



Generally distributed. (E. S. I.) 



The following additional species have been recorded as British: 



1. poly stigma, Meig. 3. geniculata, Hal. 



2. flavipatpis, Hal. 



SUBFAMILY 4. OETALIDES. 



ORTALIDES, Hal. ; Westw. Class. Ins. i. 148 (1839). Ortalides, Fal. 

 Ortalides et Aciphorece, Fal. ; Zett. Tephridita, Bigot. 



Alarum venae subcostalis et mediastinalis non conjunctce, areolcs pobra- 

 chialis et analis sat longce. Abdomen sessile. Pedes longitudine me- 

 diocres. 

 Subcostal and mediastinal veins separate. Pobrachial and anal areolets 



not short. Abdomen sessile. Legs of moderate length. 



a. Palpi thick. 



b. Colour not metallic. 1. PLATYSTOMA. 

 b b. Colour metallic. 2. ULIDIA. 



