sh 45 
3. Females; genitalia awl-shaped, directed backward............-. 4, 
Males; genitalia tubular, directed forward under the body; black, 
the palpi yellow, abdomen with a pronounced brassy tinge, 
shining, thinly white pollinose; thorax when viewed from behind 
thinly white pollinose except the front end and two subdorsal 
vitte 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, 6mm. Potomae Creek, Virginia. A single male 
specimen collected May 23, 1896, by C. W. Johnson. Type No. 
ao20U ao. National Museum... 2.2... 2: :... Js.2 5: nitida i. sp. 
4, Frontal vitta at narrowest part less than one-third as wide as the 
distanee between the posterior ocelli ...-.......:..-.. 2.25. 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 preceding section; length, 4 to 6mm. White 
Mountains and Franconia, N. H., and Potomac Creek, Virginia. 
(Trans. Amer. Ent. Soc., Vol. XIII, p. 296; Octeber, 1886: 
EU GIGHUILE eats Pura. Slit Gscigt Se 32 ote ..-@neoventris Will. 
5. Last section of third vein over one-third as long as the preceding 
section, small crossvein nearer to tip 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 vitte; 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. .diversa n sp. 
Last section, ete., as above; vitta of abdomen indistinct; length, 
5mm. ‘Two females, one captured at Sherbrooke, Canada, Sep- 
tember 25, 1896, by L’Abbé P. A. Begin, the other taken with 
themmale (see above-under'd) 0.5 s0e8 2. Seek nitida 1. Sp. 
Last section of third 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 pollinose, abdomen wholly thinly 
whitish pollinose; length, 9 to 10 mm.; otherwise as in diversa. 
Lufkin, Tex. (October 17, 1894; C. W. Johnson), and southern 
Illinois (Charles Robertson). Two female specimens. Type No. 
poten Uns. National Museum.) 2225. e os ee eee grandis i. sp. 
