FAMILY TACHINID.K — THE TACIIINIDS 421 



7. Palpi well developed Arthrochaeta Brauer & Bergenstamm 



Palpi absent or extremely small; large, robust species. 



Tachinomima Brauer & Bergenstamm 



8. Thorax without plumose hair 9 



Thorax, at least on the pleura, clothed with plumose hairs (Genotype: 



Ptilomyia bequaerti Curran) Ptilomyioides, n. g. 



9. Palpi present, strongly developed, at least as long as the second an- 



tennal segment 19 



Palpi absent or very small 10 



10. Arista plumose 11 



Arista bare or pubescent 13 



11. Posterior tibiae rather closely ciliate Opsotheresia Townsend 



Posterior tibias not ciliate 12 



12. Palpi absent *Atelogossa Coquillett 



Palpi slender and short Phasiops Coquillett 



13. Parafacials with hairs or bristles 14 



Parafacials bare; ocellars strong (54) tCylindromyia Meigen 



14. Ocellars strong 15 



Ocellars weak or absent; parafacials without bristles 18 



15. Parafacials with strong bristles below; apical cell petiolate. 



Antillicolla Curran 

 Parafacials with hair 16 



16. Apical cell ending very close to wing-tip; head short. 



Phosocephala Townsend 

 Apical cell ending far before the wing-tip; head long 17 



17. Abdomen with ordinary bristles below, rounded apically. 



Gymnomma Brauer & Bergenstamm 

 Abdomen with spines ventraliy, emarginate apically. Juriniopsis Townsend 



18. With ordinary bristles on the abdomen Epalpus Rondani 



With blunt spinose bristles on the dorsum of the abdomen. 



Rhachoepalpus Townsend 



19. Parafacials hairy or bristly to well below the middle 20 



Parafacials with at most a few hairs below the lowest frontals 33 



20. Parafacials with ordinary hairs 22 



Parafacials with bristles 21 



21. Apical cell open (73, 74) Goniochaeta Townsend 



Apical cell petiolate Eutrichogena Townsend 



22. Ocellar bristles sti'ongly developed 27 



Ocellar bristles extremely weak or absent 23 



23. Palpi but little longer than the length of the oral opening, enlarged 



apically 25 



Palpi very much longer than the length of the oral opening, with par- 

 allel sides or somewhat narrowed apically 24 



* Curiiin. 1930, Bull. Amer. Mus. Nat. Hist., Ixi. p. 92. 

 t Aldrich, 1926, Pr. U. S. N. M., Ixviii. Art. 23, pp. 1-27. 



