ART. 17. NORTH AMERICAN PHOROCERA ALDKICH AND WEBBER. 71 



ened on one-fourth its length, the penultimate joint short. Thorax 

 grayish, marked with four black vittae and bearing three dorso- 

 central bristles, scutellum grayish at base, the broad apex yellow 

 bearing three long pairs and a shorter, usually cruciate apical pair 

 of marginal bristles; there are also a pair on disk. 



Sternopleura with three bristles. Abdomen thick, the fourth seg- 

 ment globose, grayish poUinose, no distinct pattern, the fourth seg- 

 ment black or grayish, sides of second and third segment famtly 

 reddish; abdominal hairs erect in male, subdepressed in the female, 

 first segment with one pair marginals, second with one pair median 

 marginals and seldom any discals (never any arranged in pairs) 

 third usually with one or more pairs of discal (sometimes wanting) 

 and a marginal row, the fourth with two rows of macrochaetae on 

 the apical half and at the extreme apex. Legs black or brownish, 

 mid tibiae with two or more bristles on the outer front side near the 

 middle, hind tibiae sub-ciliate at most. Wings hyaline, apical cell 

 open, fourth vein beyond the bend not especially arcuate; the third 

 vein bearing two or three bristles at its base. Hypopygium con- 

 cealed, the inner forceps are somewhat longer than the outer ones, 

 curving slightly inward, the outer side of both pair are clothed with 

 short hairs. 



Length 8 to 10 mm. 



Described from a large series of both sexes collected at Lunenburg, 

 Massachusetts, May, 1914 (R. T. Webber) : one male. Juliaetta, 

 Idaho (Aldrich) ; one male, Cincinnati, Ohio, April 7. 1900; one 

 female, Germantown, Pennsylvania, April 28, 1906 ; one male, Caro- 

 line, New York, April 11, 1917 (S. H. Emerson) ; two males. Heck- 

 ton Mills, Pemisylvania, May 8, June, 1909 (W. R. Walton) ; one 

 male Pittsburgh, Pennsylvania (G. A. Ehrman) ; one male, Plummer 

 Island, Maryland, May 10, 1916 (W. L, McAfee) ; one female. Kansas 

 City, Missouri, April 21, 1899. 



This species is an important parasite of the brown tail moth, 

 Ewproctis chryson'hea Linnaeus in New England and is probably 

 the species referred to by J. D. Tothill, above cited, as having this 

 host. 



2>/>e.— Male, Cat. No. 25716. U.S.N.M., from Lunenburg, Massa- 

 chusetts. 



PHOROCERA SETIFRONS, new species. 



Front in male 0.42 and in the female 0.47 and 0.43 the head 

 width, silvery, the sides with many stout bristles outside the frontal 

 row; head of male triangular, the front in profile projecting for- 

 ward a distance equal to the eye width, in female not so strongly 

 produced; face silvery, at their narrowest part nearly one-half as 

 wide as the median depression; facial ridges bristly four-fifths of 

 the way to antennae with many long closely set bristles; bucca nearly 

 one-third the eye iieight; palpi yellow; antennae slightly shorter 



