184 BTLLETIN 31, UNITED STATES NATIONAL MUSEUM. 



Helophilus glacialis. 



Helophilua (jlacialis Loew, Stett. Ent. Zeit., 1843, 120. 



Habitat. — Labrador (Lw.) ! 



9 . Length, 12.5 to IS"""". Face deeply concave below the antennae, 

 below strongly produced, tubercle large, in profile much receding ; the 

 lower border forms with the posterior border of the head an obtuse 

 angle; in the middle a broad shining black stripe, gray dusted above, 

 but reaching to the base of the antennae; elsewhere as on the greater 

 part of the front covered with whitish-yellow, sometimes more grayish- 

 yellow, pollen ; cheeks shining black. AntennfB black; immediately 

 above their base a shining black spot; vertex blackish, the middle 

 line of the front sometimes dark ; pile of the front black, on the ver- 

 tex in moderate extent yellowish. Thorax opaque black, the usual 

 light stripes grayish-white, the front half of the lateral ones and the 

 posterior part of the middle ones indistinct ; pile of the dorsum wholly 

 yellow. Scutellum yellowish-brownish, shining; wholly yellowish pilose. 

 Abdomen black, wholly shining on the dorsum; on the second sogment 

 on each side there is a large yellow — usually three-cornered — s|)ot, of 

 which the point that is directed inward is usually somewhat whitish 

 colored, and is narrowly separated from the opposite one; on \\w third 

 segment on each side a narrow whitish arcuate band, which starts from 

 a small yellow spot on the anterior angle of the segment; on the fourth 

 segment the same whitish semi-fascia, but no indication of the yellow 

 spot; on the last segment the bands also present, but somewhat shoiter 

 and less distinct; the pile on each segment in front is whitish, behind the 

 bands, blackish ; on thelateralmarginsofeachseg*uentthe whitish yellow 

 pile reaches farther back, so that on the posterior angles only a trace 

 of the blackish pile remains. Venter shining black, beset with sparse, 

 obscure whitish pile. Femora black, the hind pair of moderate breadth, 

 the tip of all yellow; tibise black, basal third of the hind i)air, and 

 rather more than a third of the front and middle pairs yellow, the hind 

 pair moderately bent, and not thickened at the end, the tarsi through- 

 out black. Wings hyaline, somewhat grayish brownish ; stigma light 

 brown, scarcely darker at the base ; the longitudinal vein behind the 

 anal cell is somewhat strongly arcuate near its end, the last section of 

 the same vein strongly bent. 



Is intermediate in position between H. groenlandicus and II. boreali^. 

 From the former is distinguished (1) by the much more retreating face, 

 (2) by the lack of black pile on the posterior end of the black thoracic 

 stripes and the fore part of the scutellum, (3) by the indistinctness of 

 the light-colored thoracic stripes, and the somewhat more distant i)osi- 

 tion of the two middle ones, (4) by the shining color of the abdomen, 

 which in groenlandicus is confined to the posterior pare of the segments, 

 (5) by the greater slenderness of the abdominal bands, (0) by the some- 

 what less width of the hind femora, and the yellow tips. — Loew, 1. c. 



