TACHINID.E. 3 6 9 



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 subcylindrical, nearly twice as long as 



wide, second and third segments without discal macrochaetae. 60 

 Abdomen subhemispherical, only slightly longer than broad, the 

 second and third segments with discal macrochaetae. 



Hyalomyodes. 



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



o Ocellar bristles wanting (present in X. arcnata) . Xanthomelana 



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



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



Ocellar bristles curving forward; anterior cross-vein far beyond 



tip of first vein (55). , Sciasma. 



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

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



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

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



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

 Root of antennae above middle of eyes. . Eumyothyria. 



65. Eyes hairy Myiopharus. 



Eyes 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 two or three bristles near origin (26, 27). 



Oestrophasia. 

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



69. Head more than twice as high as long; occiput at most only slightly 



convex (28, 27) Oestrophasia. 



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

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



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

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

 head; 73, 74, Goniocha-ta plagiodes, wing, head; 75, Pachyophthalmus floriden- 

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

 phon a geniculate! , head; 79, Siphoplagia anomala, head; 80,81, Euthera tentatrix, 

 wing, head; 82, Epigrimgia lucens, head; 83, Chcetoplagia aterrima, head; 84, 

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

 Ch(etog(edia analis, head; 88, Metopia lugyeri, head; 89, Melanophrus insolita, 

 head; 90, Opsidia gonioides,hea,d; 91, Hystricia pollinosa, head; 92, Ch/tiomi/ia 

 flava, head. 



34 



