ART. 10 NORTH AMERICAN TACHINID FLIES WEBBER 13 



11T41 M3) ; 1 female, Somerville, N. J., July 10, 1924 (G. M. L. 

 11741 J12) ; 1 female, Somerville, N. J., September 26, 1922 (G. M. L. 

 11741 H14) ; 1 male, Somerville, N. J., August 8, 1927 (G. M. L. 

 11741 M4) ; 1 female, Pierrepont, N. Y., July 27, 1927 (G. M. L. 

 12130 M12) ; 1 male, Briclgewater, N. J., August 9, 1927 (G. M. L. 

 11741 M6) ; 1 female, Holliston, Mass., July 13, 1925 (G. M. L. 12130 

 K6) ; 1 male, Milford, Pa., July 21, 1926 (G. M. L. 12130 L5). Other 

 specimens from about the same localities as the above and from which 

 the types were chosen, number close to 150 specimens. 

 Type.—K^lQ. Cat. No. 43047, U.S.N.M. 



3. ACHAETONEURA ANISOTAE, new species 



Differs from the closely allied species, frenchii, euchuetiae^ and 

 samiae primarily in the structure of the male genitalia and the front 

 tarsi of female. 



Front of male at vertex varying from 0.28 to 0.29, in female 0.33 

 to 0.34 the head width ; front at base of antennae, in male 0.37 to 0.39, 

 in female 0.43 to 0.44 the head width; bucca measuring from one- 

 fifth to one-seventh the eye height; third point of antennae in male 

 from six to seven, and in female from four and one-half to five and 

 one-half times the second. Front in both sexes projecting beyond 

 eye from one-half to three-fourths eye width (head viewed in profile 

 measurement taken at base of antennae). Front pul villi of male 

 equal to or somewhat longer than last tarsal joint. Front tarsi of 

 female noticeably enlarged. This character appears constant in all 

 of the material examined but it is not confined to anisotae alone. It 

 occurs to some slight extent in the frenchii complex, especially in 

 those forms bred from Datana spp. Hind cross vein sinuate, distance 

 from the end to small cross vein variable, usually about one and a 

 half times its length ; distance from end of hind cross vein to angle 

 of fourth vein equal to or considerably less than its length, last sec- 

 tion of fourth vein usually sinuate, the angle rounded, apical cell 

 open. 



Face and front cinereous, usually the latter with a yellowish cast, 

 more pronounced in female, facial depression deep and more than 

 three times the width of one parafacial at narrowest part, which is 

 at this point about the width of the third antennal joint. Occiput 

 swollon below. Antennae in both sexes black, in female slightly 

 reddish at junction of last two joints. Ciliation of facial ridges 

 variable, usually a single row of evenly placed bristles, sometimes the 

 bristles irregularly arranged and appearing as a double row. 



Frontal row bristles varying in number from six to nine, usually 

 the two uppermost pairs reclinate, in some specimens three pairs, 

 or two on one side and three on the other. Front in both sexes 



