ART. 10 NORTH AMERICAN" TACHINID FLIES WEBBER 7 



it in that the thorax is much more thickly gray pollinose, front and 

 face never golden ; abdomen black, lightly gray pollinose without brownish 

 sides and bearing weak marginal bristles on second segment Also the 

 marginal bristles of the third segment are as long as or longer than 

 are those of the fourth. If third autennal joint in either sex is less 

 than three times second, see cuculliae 13. pholi, new species. 



22. Abdomen black, grayish pollinose 24. 



— Abdomen brown or golden pollinose 23. 



23. Head, thorax, and abdomen densely covered with golden pollen. 



19. spectabilis (Aldrich). 



— Head and thorax black, grayish pollinose, abdomen brownish, destitute of 



golden pollen 11. testacea, new species. 



24. Third antennal joint, in either sex, three or more times the second 25. 



— Third antennal joint scarcely twice the second; bucca one-eighth the eye 



height; small species measuring 6-8 mm. in length. 



6. cuculliae, new species. 



25. Front at vertex in both sexes about or less than eye width ; arista thickened 



at base and tapering to apex ; front pulvilli of male at least as long as 

 last tarsal joint 26. 



— Front at vertex in both sexes well over the eye width; arista thickened 



from one-half to three-fourths way ; front pulvilli of male less than 

 length of last tarsal joint ; abdomen usually thick gray pollinose. 



8. archippivora (Williston). 



26. Large robust species, 10-12 mm. in length ; hind tibiae of male densely 



ciliated without a longer bristle (in female, one longer bristle) ; fourth 

 abdominal segment densely bristly except at extreme base, bristles 

 nearest apex strongest; genitalia of male light bro\%Ti or yellowish in 

 most part, forceps when viewed from behind, at widest part, over one- 

 half as wide as long and bearing at base of inner ones a conspicuous 

 tuft of hairs; front of male moderately prominent, projecting a little 

 over one-half eye width; facialia strongly bristly a little over one- 

 half way ; front pulvilli of male smoky black, nearly as long as the 

 last two tarsal joints 15. piperi (Townsiend). 



— Medium sized species, 8 or 9 mm. in length, closely allied to piperi but 



differing from that species in its less robust form; less densely ciliated 

 hind tibiae in male which bear one longer bristle; more sparsely 

 bristled anal segment ; genitalia appearing more slender, inner forceps 

 bearing no conspicuous tuft of hairs; front less prominent; facialia 

 weakly bristly one-half way; buccal area smaller; front pulvilli of 

 male shorter and grayish rather than black 14, schizurae (Townsend). 



1. ACHAETONEURA FRENCHII (Williston) 



Masicera frencMi Williston, Seudder's Buttertlies of New England, vol. 3, 



p. 1923, 1889. 

 Achaetoneura. hesperus Brauer and Beegenstamm, Zweif. Kais. Mus. Wien, 



pt. 5, p. 334, 1891. 

 Masicera datanarum Townsend, Trans. Amer. Ent. Soc, vol. 19, p. 287, 1892. 

 Frontina malacosomae Citbran, Canad. Ent., vol. 57, p. 155, 1925. 

 Frontina sordida Curran, Trans. Roy. Soc. Canada, Sect. 5, p. 171, 1926, new 



name for malacosomae Curkan, preoc 



Brauer and Bergenstamm described hesperus from some material 

 sent them for determination by the United States Bureau of En- 



