TACHINIM;. 365 



29. First vein bare. ......... 31 



Firt vein partly or wholly bristly. ..... 30 



30. Abdomen with discal and marginal macrochaetae (28, 29). 



Euryceromyia. 

 Abdomen with marginal bristles only. . . Plectops. 



31. Palpi subcylindrical, less than half as wide as the proboscis. 32 

 Palpi flattened and usually wider than the proboscis. Lispidea. 



32. Third vein at most with four bristles near origin. . . 33 

 Third vein bristly nearly to anterior cross-vein (14). Thryptocera 



33. Arista slender on distal half; third antennal joint entire. . 34 

 Arista distally thickened; third antennal joint divided longitud- 

 inally in the male. ..... Schizotachina. 



34. Abdomen with discal macrochaetae. , 35 

 Abdomen without discal macrochaetae (15). . Clausicella. 



35. Two sternopleural bristles. ...... Nsera. 



Three siernopleural bristles. ...... Medina. 



36. Palpi absent or vestigial. ....... 37 



Palpi well developed. ........ 39 



37. Horizontal diameter of head at vibrissae as great as at base of an- 



tennae. Apinops. 



Head much shorter at vibrissae than at antennae. . . 38 



38. Facial ridges bristly almost to middle. . Pseudapinops. 

 Facial ridges almost wholly bare (63, 64). . . Ervia. 



39. First vein bare. ......... 44 



First vein partly or wholly bristly. ..... 40 



40. Eyes bare or with indistinct, short, sparse hairs. . . 41 

 Eyes distinctly hairy Hypochaeta. 



41. Diameter of head at vibrissae as great as at root of antennae. 42 

 Head shorter at vibrissae than at root of antennae. Chsetophleps 



42. Arista pubescent, the longest hairs scarcely half as long as the 



greatest diameter of arista. ...... 43 



Arista bearing short hairs, the longest of which are slightly longer 

 than the greatest diameter of arista. . Leskiomima. 



43. Frontal vitta next the antennae nearly four times as wide as either 



side of front; third vein not bristly to anterior cross-vein; scutel- 

 lum with two pairs of marginal macrochaetae. Lasioneura. 

 Frontal vitta next the antennae at most twice as wide as either side 

 of the front; third vein bristly almost to the tip; scutellum with 

 three pairs of marginal macrochaetae. . . . Actia. 



Fig. 149. Tachinidae. 18, 19, Acaulviui costata, wins:, head; 20, A/ophora 

 fiuiiosa, wing; 21, Phorantha, sp wing, head; '25, Eusbopolia dakotensis,vring; 

 26, 27, Oestrophasia cak-a, wing, head; 28, 29, Enceromyia robertsoni, wing 

 (bristles omitted from base of first vein, and small costal spines), head; 3o, 

 81, Pht/to clesides, wing, head; 82, 38, Hhinophora mexicana, wing, head; 34, 

 Cryptomeiqenia eumyothyroides, head; 35, Myiophasia (?nea, head; 36, Anisia, 

 sp. head; 37, 38' Hemyda auratn, wing, head; 39, Elaphi palpus t sp. wing: 40, 

 41, MeiacluHa atra, wing (bristles omitted from first and third veins), head. 



