ART. 10 NORTH AMERICAN TACHINID FLIES WEBBER 19 



bristles of unequal strength none of which is as long as those of the 

 third segment. 



Mid tibiae with one strong outside bristle near middle. Hind 

 tibiae evenly ciliate with one long bristle. 



Wing venation as in frenchii. 



Length, 6-8 mm. 



Described from one female labeled, " Emerged Sept. 27, 1917 ; 

 from Gucullia sp., Falls Church, Va., Sept. 2, 1917." The puparium 

 is pinned with the fly and seems to agree with that of frenchii. 



Type.— Female. Cat. No. 43050, U.S.N.M. 



Placed provisionally as this species are specimens of both sexes 

 from the Gipsy Moth Laboratory, bred by J. V. Schaffner, jr., from 

 Dasylophia anguina Smith and Abbot from larvae collected at May- 

 brook, N. Y., June 23-26, 1924 (G. M. L. 12164 J 147). This ma- 

 terial, although agreeing fairly well with the type excepting in minor 

 characters, may eventually prove to be a variety. Front of male 

 0.23, of female 0.30 the head width ; at widest part (base of anten- 

 nae), in male 0.40, in female 0.44 the head width. Bucca one-fifth 

 the eye height, in female slightly less. Eyes very faintly pubescent. 

 Face and front silvery pruinose. Frontals variable in number and 

 not of uniform strength. Antennae black, the third joint in both 

 sexes about two and one-fourth times the second. Arista gradually 

 tapering. Facial ridges bristly one-half way. The thoracic chae- 

 totaxy appears the same as in cucidliae excepting that, in some in- 

 stances, the apical scutellar bristles are not directed upwardly. 

 Abdomen black, gray pollinose, first segment without bristles, second 

 with or without one strong median marginal pair, third with mar- 

 ginal row of strong bristles which are a fourth longer than any of 

 these of the last segment, fourth segment moderately bristly, with 

 well-defined marginal and submarginal rows, the latter strongest. 

 In all of the specimens, the anal segment appears less bristlly above 

 than in the type. 



Legs black, the mid tibiae with one long bristle on outside near 

 middle as in the type specimen; hind tibiae evenly ciliate with one 

 longer bristle. 



Length, 5-9 mm. 



One female labeled, "Parasite on Dasylophia anguina Smith, 

 Beverly, Mass. Collection G. V. Riley," and two females labeled, 

 " 5573o 2X, Sept., '92." The first of these three specimens is prob- 

 ably the one referred to Frontina frenchii or aletiae by Coquillett.^" 

 Another specimen, a female from Beltsville, Md., collected Septem- 

 ber 3, 1916, by W. S. McAtee, also appears to be of this species. In 

 this specimen, the first segment bears no marginal bristles and the 

 second has but one weak bristle and one longer hair. 



10 Revision of N. A. Tachinidae, p. 15-16, 1897. 



