72 Tachinidae. 



53. Both sexes with two orbital bristles; frons rather 

 protruding, of equal breadth in both sexes, with 



parallel margins 69. Thelymyia. 



— Male without, female with two orbital bristles; 

 frons somewhat widening downwards, narrower 



in male than in female 64. Exorista. 



54. Antennal arista geniculate, thickened to apex 

 and rather thick, second joint as long or half as 



long as third 103. Germaria. 



— Antennal arista not thickened to apex, second 



joint shorter 55. 



55. Eyes bare 56. 



— Eyes hairy 63. 



56. Antennæ quite short; jowls as broad as the eye 



is high; vibrissal ridges converging below 97. Trixa. 



— Antennæ not short; jowls less broad; vibrissal 



ridges not converging 57. 



57. Discai angle with a veinlet or fold, though some- 



times small {Ptychomyia) 58. 



— Discai angle without veinlet or fold 59. 



58. Cubital vein with bristles only at base 83. Tachina. 



■ — Cubital vein with bristles to near medial cross- 



vein 72. Ptychomyia. 



59. First posterior cell terminating somewhat near 

 apex of wing; exca vation on second abdominal 



segment not reaching hind margin 139. Vibrissina. 



— ■ First posterior cell terminating longer before 



apex of wing 60. 



60. Cheeks with bristles or hairy 61. 



— Cheeks bare 62. 



61. Cheeks with bristles; arista with second joint 



short 73. Gaedia. 



— Cheeks hairy; arista with second joint elongated . . 86. Baumhaueria. 



62. Costal spine long ; apical scutellar bristles Crossing 104. Brachychaeta. 

 Costal spine wanting; apical scutellar bristles 



- — diverging 87. Histochaeta. 



63. Ocellar bristles directed outwards 77. Campylochaeta. 



■ — Ocellar bristles directed forwards 64. 



64. Apical scutellar bristles erect or proclinate, 

 Crossing; frons broad and about equal in both 

 sexes, with about parallel or a little diverging 

 margins; claws and pulvilli short and front tarsi 



in female simple 70. Phryxe. 



■ — Apical scutellar bristles directed more back- 



wards ; claws and pulvilli often elongated in male 65. 



65. Vibrissæ not or scarcely reaching above the 



middle 66. 



