NORTH AMERICAN HYMENOPTERA. 
53 
A. violcC 9 . — Black ; head wider than thorax, clothed with pale ochraceous 
pubescence; clypeus strongly produced and strongly punctured ; basal process of 
labrum very large, semicircular, notched at tip; flagellum ferruginous beneath 
towards tip; thorax sparsely and rather strongly punctured, clothed with thin, 
pale, ochraceous pubescence; wdngs yellowish hyaline, second submarginal two- 
thirds as wide as third, nervures, stigma and tegulae dull honey-yellow ; en- 
closure of metathorax slightly roughened; posterior tarsi and apical joints of 
anterior and middle pairs ferruginous; abdomen rather closely, strongly and 
evenly punctured, margins narrowly testaceous, third and fourth broadly and 
slightly depressed, 2-4 each with an even, narrow, dense apical fascia of yellowish 
pubescence, anal flmbria brown. Length 10 mm. 
% . — Closely resembles the female, but the pubescence is paler, flagellum more 
yellowish beneath, wings more hyaline, nervures and tegulae darker. Length 
8 — 9 mm. 
Four females, two males, taken on flowers of Viola palmata, April 
20th and 21st. The tongue of this species is remarkably long and 
slender. 
A. salicis 9- — Black; the pubescence fulvous; head as wide as thorax, 
clypeus closely and strongly punctured, a median raised line impunctate; basal 
process of labrum small, truncate; thorax with sparse shallow punctures, the 
pubescence thin ; wings yellowish hyaline, faintly clouded beyond the marginal 
cell, nervures and stigma honey-yellow, second submarginal one-half as wide as 
third, tegulae dark with a dull testaceous spot ; enclosure of metathorax flnely 
roughened ; abdomen flnely roughened, but impunctate, narrow apical margins 
of segments dull testaceous, apical margins of second, third and fourth segments 
with a thin fascia of fulvous pubescence, more or less interrupted on second and 
third, anal flmbria fusco-fnlvous ; hind tarsi ferruginous or yellowish, the apical 
joint blackish. Length 8 — 9 mm. 
'Ji . — Resembles the female; the abdomen not fasciate. Length 7 mm. 
Three females, one male, taken from April 10th to 20th, on flowers 
of Amelanchier canadensis, Salix hwnilis and S. cordata. 
A. ery tliroiiii 9 • — Black ; clypeus flat, rather rough with transvmrse rugae, 
but not very closely or strongly punctured, a central longitudinal ridge impunc- 
tate ; basal process of labrum triangular, truncate at tip; thorax sparsely and 
feebly punctured, clothed with thin, pale fulvous pubescence, enclosure of meta- 
thorax finely roughened ; wings hyaline, nervures, stigma and tegulae dull tes- 
taceous; legs blackish or dull ferruginous, apical joints of tarsi paler, scopa white 
beneath, fuscous above; abdomen finely roughened, impunctate, apical margins 
of segments depressed, the extreme edge pale testaceous the abdomen clothed 
with thin pubescence, which forms whitish fasciae on the apical margins of the 
segments, anal fimbria fuscous. Length 10 — 12 mm. 
'J, . — Resembles the female; mandibles long, face subquadrate, clypeus with a 
thin white beard, head produced behind the eyes; abdomen sparsely and finely 
punctured, more greenish than in female, testaceous, apical margins broader. 
Length 8 — 9 mm. 
Ten females, three males, taken from April 2d to 13th, on flowers 
of Erigenia bulbosa, Salix humilis and Erythronium albidum. 
