45 



3. Females; genitalia awl sliai)ed, clirected backward 4. 



Males; genitalia tiibiilar, directed forward under the body; black, 



the palpi yellow, abdomen with a pronounced brassy tinge, 

 shiuiug-, thinly white polliuose ; thorax when viewed from behind 

 thinly white pollinose except the front end and two subdorsal 

 vitta^ behind the suture ; eyes separated as widely as the posterior 

 ocelli, calypteres grayish white, wings whitish hyaline, base to 

 tip of second basal cell yellow, costa strongly arcuate, last 

 section of third vein nearly half as long as the preceding- sec- 

 tion; length, G mm. Potomac Creek, Virginia. A single male 

 specimen collected May 23, 1806, by 0. W. Johnson. Type No. 

 1 c t1 3520. U, S. National Museum nitida n. sp. 



4. F rontal vitta at narrowest part le»s than one thnxl aa wide a trtire 

 distance between the pootorior ocelli --5.- 



Frontal vitta at narrowest part as wide as the distance between the 

 posterior ocelli; last section of third vein slightly over one-third 

 as long as the i^receding section; length, 4 to G mm. White 

 Mountains and Franconia, N. H., and Potomac Creek, Virginia. 

 (Trans. Amer. Ent. Soc, Vol. XIII, p. 296; October, 188G: 



L<u^tJL Hyalomi/ia.) . . .(vncorentrlH Will. 



5.ALast section of third vein over one-third as long as the preceding- 

 section, small crossveiu nearer to tij) of first vein than to tip of 

 the auxiliary, or midway between them; black, the palpi yellow; 

 thorax, when viewed from behind, subopaque whitish pollinose, 

 with indistinct black vitt;i^; eyes separated slightly wider than 

 width of lowest ocellus; face white or gray pollinose; abdomen 

 on the last three segments whitish pollinose, the second and 

 third segments with a black dorsal vitta; calypteres whitish or 

 yellowish ; wings hyaline, the base to slightly beyond the hu- 

 meral crossvein yellowish; length, 9 mm. Beverly, Mass. A 

 female specimen collected October 11, 1870, by the late Edw. 

 Burgess. Type No. 3521, U. S. National Museum, .dlrersa n sp. 

 Last section, etc., as above; vitta of abdomen indistinct; length, 

 \ 5 mm. Two females, one captured at Sherbrooke, Canada, Sep- 



\, tember 25, 1896, by L'Abbc P. A. Begin, the other taken with 



^ the male (se^ abovaimder 3) /^€. . nitida n. sp. 



ALast section of tmird vein less than one-sixth as long as the preced- 

 ing section, small crossvein nearer to tip of auxiliary vein than 

 to tip of first vein; eyes separated about half the width of the 

 lowest ocellus; face yellow polliuose, abdomen wholly thinly 

 whitish polliuose; length, 9 to 10 mm.; otherwise as in dii^erm. 

 Lufkin, Tex. (October 17, 1894; C. W. Johnson), and southern 

 Illinois (Charles Robertson). Two female specimens. Type No. 

 3522, U. k5. National Museum (jrandis n. sj). 



