FAMILY METOPIID.E THE FLESH FLIES 405 



and the same is true of CalUphora as Onesia has pajje priority. Since 

 Sacrophaga was proposed long- after Metopia and Calliphorn the name 

 could scarcely be used in any event. 



KEY TO GENERA 



1. Arista pubescent or bare 2 



Arista plumose 23 



2. First vein bare 3 



First vein setose Opsldiopsis Townsend 



3. Apical cell closed 4 



Apical cell open 6 



4. Distal section of the fifth vein longer than the penultimate section 



(16) Taxigramma Ferris 



Distal section of the fifth vein little more than half as long as the 

 penultimate section 5 



5. Apical cell ending far before the wing tip, short petiolate (19). 



Hilarella Rondani 

 Third vein ending only a little before the wing tip, the apical cell long 

 petiolate (4, 30) Phytodes Townsend 



' 6. Facial ridges without bristles or they are short and hairlike, the 



parafacials often bristly 7 



Facial ridges with bristles on lower half or more (12) 6a 



6a. Arista thin on apical third Sphenometopa Townsend 



Arista wholly thickened (2, 12) Euaraba Townsend 



7. Parafacials with only fine hair, without bristles, or with only one below. 11 

 Parafacials with a row of bristles (cf. Camptopyga) 8 



8. Antennae reaching almost to the oral margin 9 



Antennae very short, the third segment scarcely longer than the second 



(5, 9) Neophyto Townsend 



9. Facial ridges divergent below, the depression wider than parafacial .... 10 

 Facial ridges with parallel sides, the depression deep, narrow and not 



as wide as either parafacial (18) Opsidea Coquillett 



10. Third antennal segment not more than twice as long as the second; face 



not strongly receding (10) Brachicoma Rondani 



Third antennal segment more than three times as long as the second; 

 face very strongly receding (1, 20) Metopia Miegen 



11. Apical cell ending in the wing tip Opelousia Townsend 



Apical cell ending far before the wing tip 12 



12. Head at vibrissse much shorter than at base of antennae, the oral margin 



not produced 13 



Head at vibrissas almost or quite as long as at base of antennae, the 

 oral margin usually prominent 17 



13. Abdominal bristles strong 14 



Abdominal bristles poorly differentiated from the hair; abdomen sub- 

 globose CEstrohilarella Townsend 



14. Frontals not extending below the base of the antennae 15 



Frontals descending to the middle of the second antennal segment. 



Phrosinella Desvoidy 



