AET. 17. IsTORTH AMERICAN PHOROCERA ALDRICH AND WEBBER. 63 



Described from two males: one from New Haven, Connecticut, 

 reared from the sawfly DipHon simile Hartig by W. E. Britton, 

 July 19, 1915 ; the other " reared from several pupae under bark " by 

 A. J. Conradi, at Clemson, South Carolina. 



r?/;?e.— Male, Cat. No. 25710, U.S.N.M., from New Haven, Conn. 



Although the genitalia are almost identical with those of claripen- 

 nis, the antennae are much broader, the abdomen darker and the 

 abdominal hairs more erect than in that species. There are other 

 minor differences. 



PHOROCERA IMITATOR, new species. 



Male. — Front 0.28 of head width, yellowish poUinose with short 

 hairs outside the frontal rows, the latter fully meeting the rows of 

 strong cilia on the facial ridges. Antennae brownish black, the third 

 joint very long, fully four times the second, slightly widening to the 

 apex; arista slender, very slightly thickened on the basal fourth; 

 bucca one-fourth the eye height ; palpi long, yellow, proboscis fleshy. 

 Thorax yellowish gray pollinose, the usual dark stripes rather nar- 

 row when viewed from behind; dorsocentrals four, sternopleurals 

 three, one rather stout pteropleural. Abdomen broad, not elongate; 

 the intermediate segments ahnost entirely pollinose, only the hind 

 edge of the third subshining, the fourth segment mostly pollinose 

 but more shining in certain lighfs; first segment without marginals, 

 second segment with one large pair, the third segment with a row of 

 eight, of which the median two pairs are very stout ; fourth segment 

 with dense, erect, spiny hairs mixed with bristles which also extend 

 below on the hind edge. Genital segments small, brown, the united 

 inner forceps forming a slender flattish tapering organ, grooved 

 behind except at base, its tip forming a small knob which is bent a 

 little backward, the whole hind side up to the knob covered with 

 erect but not very dense black hair ; on each side of the organ along 

 its middle is a series of stiff spines directed toward the base about as 

 long as the hairs. This structure as a whole is entirely different 

 from any others examined by us; fifth sternite deeply incised, the 

 lobes thickened along the inner side, with a few hairs on the outer. 

 Legs black, the middle tibiae with two bristles on the outer front 

 side, the hind tibia on the outer side with a uniform row of about 

 24 straight bristles interrupted in the middle by one bristle nearly 

 twice as long. Wing hyaline, the fourth vein bent almost at a right 

 angle and with a very slight fold, the apical cell rather widely open. 



Length 12.5 mm. 



One specimen Lyme, Connecticut, September 4, 1909 (Champlain 

 Coll.). 



Type.— Male, Cat. No. 25711, U.S.N.M. 



5596— 24— Prw.N.M.vol.GS 32 



