300 PROCEEDINGS OF THE NATIONAL MUSEUM vol. so 



reddish beneath ; second antenna! segment mostly black, a little less 

 than one-third length of third segment; anal forceps (fig. 17, /) 

 strongly incurved, their posterior surfaces moderately pilose; four 

 dorsocentral bristles; no posterior preintraalar bristle; front and 

 upper part of face yellowish pollinose, paler below; parafacialia at 

 narrowest part compared with distance between vibrissae 7.6 : 18.6 

 (average of six) ; cheeks about one-fourth of eye height, with a predom- 

 inance of pale hairs; facial ridges bristly about one-third way to an- 

 tennae, the uppermost ones very weak; vibrissae slightly above oral 

 margin. Length 13 mm. 



Female. — Doubtfully known. 



ry;?e.— Male, U. S. N. M. No. 53388. 



RemarTis. — The holotype is from Morris County, N. J., collected 

 by the writer on May 10, 1936. The two paratypes are both males, 

 from Eeading Mass., May 26, 1916 (K. T. Webber), and Wellesley, 

 Mass., June 1, 1909 (J. D. Tothill), respectively. 



In 40 other males identified as acosta the lobes of the fifth sternite 

 are smooth in 19, nearly so in 11, and slightly ridged in 10. All but 

 one of them have four dorsocentrals. In only one instance is the 

 posterior preintraalar bristle present. The fourth sternite is turned 

 upward from the abdomen in all but eight, in which case it is 

 flattened. Usually the fourth abdominal segment is black, moder- 

 ately pollinose but occasionally thinly pollinose and indefinitely 

 marked; posterior border of segment black. Second antennal seg- 

 ment usually black, in 3 specimens slightly reddish, scutellum wholly 

 black in 16, slightly reddish at apex in 22, and black, conspicuously 

 marked with yellow, in 2; second genital segment always black, 

 sometimes reddish beneath, densely pilose above. The pilosity on the 

 hind surface of the anal forceps is dense in 23 specimens and but 

 moderately so in 17. The front and upper part of the face are pale 

 yellow pollinose, in no instance distinctly golden. In some specimens 

 the lower part of the face is silvery either with or without a pale 

 3'ellowish cast. Length 10-17 mm. 



Hosts. — Graptolitha disposlta Morrison (G. M. L. 11705 J7) ; G. 

 innominata Smith (G. M. L. 11705 M8) ; G. a7itennata Walker 

 (G. M. L. 12161 J9); Graptolitha sp. (G. M. L. 11705 N2). All 

 recorded at the Melrose Highlands laboratory by J. V. Schaffner, 

 Jr., et al. 



Material examined. — About 45 males, from Massachusetts and 

 New Jersey localities, contained in the collection of the Melrose 

 Highlands laboratory. 



