20 THOMAS SAY FOUNDATION 



6. Arista short-plumose 7. 

 Arista loiig-pluiiiose 10. 



7. Parafacial witli a single maerochaeta below, pro- 



clinate (Louisiana, Texas) 



Camptopyga n. g. 

 Parafacial with a row of hairs. 8. 



8. No costal sj^ine (widespread north) 



A grid Desvoidy. 

 Costal spine strongly developed 9. 



9. Back of head with only black hair; anterior 



acrostichals very large (northeastern) 

 Harhcckia n. g. 

 Back of head with some pale hair; no ant acr 

 (widespread) Hypopdta n. g. 



10. Two large posterior dorsocentrals, two equally 

 large anterior ones (tropical) 



Notochccta n. sp. 

 Generally three or four ps dc, if only two tlie 

 anterior ones are much reduced 11. 



n. Vibrissa? approximated and high above the oral 

 margin (the distance equaling the length of 

 the second antennal joint) (widespread) 

 Emblem asoma n. g. 

 Vibrissa? normal, or if somewhat approximated 

 they are not strikingly removed from the 

 oral margin 12. 



12. Parafacials quite bare; first vein hairy (Louis- 



iana) Stheuopijgd n. g. 



Parafacials with hairs, sometimes delicate. 13. 



13. Ocellars absent; frontal rows not noticeably di- 



vergent below, reaching base of antennae 

 (tropical) Harpagopj/ga n. g. 



Ocellars present ; if absent, the frontal rows are 

 abruptly divergent below and reach al)out 

 to the middle of second antennal joint 14. 



14. Fifth sternite of male undivided; epaulet yel- 



low; back of head with only black hair 

 (northeastern) Thclodiscus n. g. 

 Fifth sternite of male deeply divided (wide- 

 spread) Sarcophaga Meig. 



