AET. 10 NORTH AMERICAN TACHINID FLEES WEBBER 33 



17. ACHAETONEURA LANIIFERAE, new species 



Front of male at vertex 0.28, at widest part 0.43, in female at 

 vertex 0.32, at widest part 0.42 of the head width; front and face 

 golden poUinose. Inner eye margins divergent, the eyes widely 

 separated below. Antennae in both sexes three-fourths length of 

 face; second joint yellowish, about one-half as long as third, the 

 latter black; bucca one-fifth the eye height. 



Thorax black, gray pollinose, the chaetotaxy as in frenchii; scu- 

 tellum brownish, bearing four pairs of marginal bristles besides a 

 weak apical pair; the bristles nearest the suture and those nearest 

 the apical pair strongest. 



Abdomen more or less brownish in ground color, thinly grayish 

 pollinose, the anal segment yellowish or yellowish brown, gray polli- 

 nose. No vitta or definite pattern obvious along the dorsum, first 

 and second segments with weak marginal bristles scarcely distin- 

 guishable from the adjacent hairs. Abdominal hairs depressed. 



Mid tibiae with one strong bristle on the outer front side near 

 middle. Hind tibiae evenly ciliated without a longer bristle. 



Wings with normal venation. 



Length, 8-9 mm. 



Described from a specimen of each sex reared from a cocoon of 

 Laniifera cydades, collected January 1, 1927, the flies issuing May, 

 1927. Both specimens are labeled, " 51." Locality : Mexico. 



Type.—K?i\Q. Cat. No. 43056, U.S.N.M. 



18. ACHAETONEURA FERRUGINEA (Reinhard) 



Frmitina ferruginea Reinhard, Ent. News, vol. 35, p. 269, 1924. 



Front at vertex about one-third head width, cinereous, face silvery 

 white, slightly receding, facialia bristly three-fourths way in male, 

 slightly less so in female; bucca narrow, about one-fifth the eye 

 height. Antennae black, as long as face, third joint in male six or 

 seven, and in female five or six times longer than the abbreviated 

 second. 



Thorax black, gray pollinose, the chaetotaxy as in frenchii; scu- 

 tellum with three pairs of marginal bristles besides the cruciate 

 apical pair. 



Abdomen slender, reddish yellow, with a well defined black dorsal 

 vitta ; all segments with marginal bristles, those of the anal segment 

 being equal in size to those of the third. 



Legs black, basal joints sometimes yellowish. Mid tibiae with 

 one long: and one small bristle above it on outer front side; hind 



