54 
CHARLES ROBERTSON. 
A. goranii 9- — Blue-black; clothed with long, thin, whitish pubescence; 
cl.vpeus sparsely punctured, shining, with a faint purplish reflection ; basal pro- 
cess of labrum long, narrow, with a rather deep notch at tip; lateral grooves of 
face filled with a dark, brownish black tomentum ; thorax sparsely punctured, 
scutellum more shining and with more evident metallic reflections, enclosure of 
metathorax longitudinally striate at base, smoother beyond; wings hyaline, 
stigma fuscous, nervures fuscous or testaceous, second submarginal receiving the 
recurrent nervure before the middle, tegulse piceous, sometimes with a large tes- 
taceous spot; abdomen blue, shining, impunctate, apical margins of segments 
2-4 each with a thin fascia of white pubescence, anal fimbria dirty white. Length 
7 — 8 mm. 
'J, . — Closely resembles female; face rounded, thinly clothed with whitish pu- 
bescence, mandibles short, toothed near the tip; flagellum long, testaceous be- 
neath ; middle tibia with a slender spine at apex exteriorly. Length 6 — 7 mm. 
Three females, six males, taken May 3d and 11th, on flowers of 
Geranium maculatum and Osmorrhiza longistylis. 
A. poleinonii 9- — Robust; greenish, with bluish and purplish reflections 
in certain lights, clothed with thin whitish pubescence; clypeus densely and 
minutely roughened, strongly and sparsely punctured, with a strong purplish 
reflection; basal process of labrum broad and truncate, flagellum testaceous be- 
neath ; thorax sparsely punctured, clothed with thin pale pubescence, enclosure 
of metathorax finely roughened, poorly defined ; wings hyaline, tegulae and ner- 
vures testaceous, second submarginal cell large; abdomen impunctate, apical 
margins of second, third and fourth segments and anal fimbria with whitish 
pubescence. Length 6 — 7 min. 
Tj • — Resembles the female; face thinly pubescent, antennie long, testaceous 
beneath, middle tibia spined at apex. Length 6 mm. 
Three females, one male, taken on flowers of Polemoninm replans, 
on April 20th and 26th. 
A. illiiioieiisi^ 9- — Form slender; greenish, with bluish and purplish re- 
flections, clothed with thin whitish pubescence; clypeus rather clo.sely and 
strongly punctured : basal process of labrum small, semicircular ; flagellum dull 
testaceous beneath towards tip; thorax impunctate or nearly so, the scutellum 
pur])lish, enclosure of metathorax broad, rough ; wings long, yellowish hyaline, 
nervures testaceous, tegulae pale testaceous; abdomen impunctate, apical margins 
of segments testaceous, second, third and fourth with short, thin fasciae of white 
pubescence, anal fimbria whitish. Length 7 — 8 mm. 
%. — Resembles the female; the clypeus densely bearded, flagellum beneath 
and tarsi usually testaceous; thorax more strongly punctured, middle tibia with 
a short spine at tip. Length 6 — 7 mm. 
Thirteen females, fifteen males. This species is commonly infested 
by Stylops. I have taken it from April 2d to May 3d, on flowers of 
Stellaria media, Geranium maculatum, Amelanchier canadensis, Eri- 
genia bidbosa, Salix cordata and S. liumilis. Three pairs were taken 
in copula on flowers of Salix cordata, April 10th. 
