FAMILY OTITin.E THE PICTURED-WIXG FLIES 279 



41. Tip of the anal cell extending beyond the apex of the second basal 



cell " 42 



Tip of the anal cell not produced beyond the apex of the second basal 

 cell (28, 41 ) Xanthacrona Wulp 



42. Five pairs of dorsocentrals and acrosticals (17, 90) . . . .Dyscrasis Akh'ich 

 Two pairs of dorsocentrals (33) Myennis Desvoidy 



43. Triangle of the anal cell almost as long as the basal section 44 



Triangle much shorter than the basal part 45 



44. Wings with parallel sides (11, 108) Pterocalla Rondani 



Wings widest sub-basally (99, 106) Callopistromyia Hendel 



45. Anal cell convex apically, sometimes ti'ansverse on the posterior third, 



but never with a produced angle (23, 101). . . .Paragorgopsis Giglio-Tos 

 Anal cell at least somewhat protluced posteriorly 46 



46. Second vein almost straight 47 



Second vein strongly sinuous apically (91, 103) . .Pseudopterocalla Hendel 



47. Anterior crossvein situated at or before the middle of the discal cell 



(52, 87) Dasymetopa Lcew 



Anterior crossvein situated beyond the middle of the discal cell (7, 

 109) Pseudotephritis Johnson 



48. Occiput very broad and convex from lateral view 49 



Occiput narrow, usually flattened 52 



49. Without sternopleurals (16, 75) Myrmecothea Hendel 



With one sternopleural 50 



50. Posterior ci'ossvein situated more than its own length beyond the 



anterior crossvein (62, 79) Myrmecomya Desvoidy 



Posterior crossvein situated less than its length beyond the anterior 

 crossvein 51 



51. Costal cell wide, convex anteriorly (3, 55) Delphinia Desvoidy 



Costal cell narrow, its anterior edge straight (47, 70) Tritoxa Lcew 



52. Abdomen somewhat laterally compressed; one pair of weak frontal 



bristles above; third antennal segment elongate; arista bare (2). 



Senopterina Macquart 

 Abdomen cylindrical or flattened, if slender the arista is plumose, the 

 antennae are short or there are two pairs of frontals 53 



53. Abdomen elongate, more or less cylindrical basally 55 



Abdomen short and rather flattened 54 



54. Costal cell widened, anal cell angled posteriorly (15). 



Ostracocoelia Giglio-Tos 

 Costal cell normal; anal cell rounded posteriorly (39, 65). 



Amphicnephes Lcew 



55. Sternopleural bristle absent 57 



Sternopleural bristle present 56 



56. Anal cell rounded apically (4, 71 ) Idana Lcew 



Anal cell angulate posteriorly (57, 66) Diacrita Gerstjecker 



