57. Second abdominal segment of female with many short spines be- 



neath. ........ Celatoria. 



Venter without such spines. ..... Myothiria. 



58. Apical cell open, or with a petiole less than one-half as long as the 



posterior cross-vein. ........ 62 



Apical cell closed. ......... 59 



59. Abdomen cylindrical or sub-cylindrical, nearly twice as long as 



wide, second and third segments without discal macrochsetae. 60 

 Abdomen subhemispherical, only slightly longer than broad, the 

 second and third segments with discal macrochaetae. 



Hyalomyodes. 



60. Ocellar bristles present. ..... 61 



j Ocellar bristles wanting (present in A', arcuata} . Xanthomelana 



61. Ocellar bristles curving backward; anterior cross-vein about even 



with tip of first vein (67, 68). . . Leucostoxna. 



Ocellar bristles curving forward; anterior cross- vein far beyond 



tip of first vein (55). , . . Sciasma. 



62. Head at vibrissas shorter than at base of antennae. . , 63 

 Head at vibrissae as long as at base of antennas. ... 66 



63. Occiput at most only slightly convex; body short and robust. 64 

 Occiput strongly convex; body elongate. Eutrixa(Vanderwulpia). 



64. Root of antennas below middle of eyes. .... 65 

 Root of antennae above middle of eyes. . Eumyothyria. 



65. Eyes hairy Myiopharus. 



Kyes bare (26, 27 ) Oestrophasia. 



66. Body short and robust. ........ 67 



Body elongate and slender; apical cell short petiolate (71, 76). 



Xanthomelana. 



67. Antennae not reaching below the lowest third of face; frontal bris- 



tles usually not descending below base of second antennal 

 joint. ........... 69 



Antennae reaching to or below the lowest fifth of face; frontals 

 usually descending below base of second antennal joint. 68 



68. Third vein with twoor three bristles near origin (26, 27). 



Oestrophasia. 

 Third vein with but one bristle near origin. . . Dionsea. 



69. Head more than tvice as high as long; occipiit at most only slightly 



convex (28, 27) Oestrophasia. 



Head about one and one-third times as high as long; occiput iisu- 

 ally strongly convex. ....... 70 



Fig. 151. Tachinidse. 69, Siphoplagia anomala, wing; 70, Beskia cornuta 

 head; 71, Xanthomelana arcuata, wing; 72, Pachyophthalmus Jloridensis, 

 head; 73, 74, Goniocfxeta plagiodes, wing, head; 75, Pachyophthalmus Jloriden- 

 sis, wing; 76, Xanthomelana arcuata, head; 77, Linncemyia, sp. wing; 78, Si- 

 phon a t/eniculata, head; 79, Siphoplagia anomala, head; 80,81, Euthera tentatrix, 

 wing, head; 82, Epigrimyia lucens, head; 83, ChcEtoplagia aterrima, head; 84, 

 85, Euthyprosopa petiolata, wing, head; 86, ChcEtoplagia aterrima, head; 87, 

 Chwtogiedia analis, head; 88, Metopia lugyeri, head; 89, Melanophrys inso/ita, 

 head; 90, Opsidiagonioides,liea.d', 91, Hystriciapollinosa, head; 92, Clytiomyia 

 flava, head. 



34 



