NORTH AMERICAN HYMENOPTERA. 
57 
spot; legs black, posterior tarsi sometimes dull ferruginous; abdomen closely, 
evenly and rather strongly punctured, apical margins of segments 2-4, inter- 
rupted on second, with close fascise of white pubescence, anal fimbria fuscous. 
Length 9 — 10 mm. 
% . — Resembles the female, process of labrum longer, concave anteriorly, cly- 
peus andl arge spot on each side of face below antennae, yellow. Length 7 — 10 mm. 
Twenty-four females, twenty-two males, taken from April 5th to 
June 4th on flowers of Stellaria media, Claytonia virginica, Xanthoxy- 
lum armerieanum, Prunm serotina, Amelanchier canadensis, Zizia aurea, 
Polytceuia nuttallii, Pimpinella integerrima, Sanicula marilandica, 
Pastinaca saliva, Heracleu7a lanahim, Salix coi'data and S. Jmmilis. 
The sexes were taken in copula on Stelkma, April 8th. Dedicated 
to Mr. E. T. Cresson. 
A, pulchella 9- — Black; clypeus dull ferruginous, sometimes with an 
arcuate yellow spot above, rather strongly but not very closely punctured ; basal 
process of labrum broad, very short, emarginate; mandibles ferruginous in mid- 
dle, black at tip; flagellum testaceous beneath, lower part of face with a large 
yellow spot on each side, extending below upon each side of clypeus ; thorax 
closely and rather strongly punctured, the surface concealed by thick, rather 
long fulvo-ochraceous pubescence, enclosure of metathorax finely roughened : 
wings hyaline, nervures and tegulse testaceous, stigma small, dark; legs dull 
ferruginous, the tarsi, especially the posterior pair, inclining to yellowish ; abdo- 
men closely, finely and rather strongly punctured, broad, somewhat depressed, 
apical margins of the segments pale testaceous, with long pale ochraceous pu- 
bescence, which forms thin fasciae, anal fimbria of the same color. Length 11— 
13 mm. 
Seven females, taken from August 30th to September 20th, on 
flowers of Heliantlms grosse-serratus and H. rigidus. 
A. alicicC 9- — Black, thinly clothed with pale pubescence; clypeus yellow, 
with a dark spot on each side; basal process of labrum broad, short, slightly 
emarginate. mandibles not toothed ; thorax siiarsely and feebly punctured, en- 
closure of metathorax finely roughened ; wings somewhat clouded, nervures and 
stigma black, tegulfe piceous; legs black, scopa pale fulvous; abdomen opaque, 
finely roughened, impunctate, or with sparse, feeble punctures, apical margins 
of segments having laterally narrow fascife of white pubescence, anal fimbria 
fuscous. Length 12 mm. 
One female, taken on flowers of Bidens chrysanthemoides, Sej)t. 20. 
A. Hilda 9-— Black; clypeus strongly punctured ; basal process of labrum 
large; mesothorax smooth and shining, bare, with very few large punctures, 
scutellum and postscutellum closely and very strongly punctured ; tubercles, a 
line over the tegulse, scutellum and postscutellum with short feathery hairs, a 
row of long hairs on the posterior margin of scutellum; metathorax sharply 
truncate, rough with coarse reticulations, the disc with strong longitudinal rugse ; 
wings yellowish hyaline, apical margins faintly clouded, nervures, stigma and 
TEANS. AM. ENT. SOC. XVIII. 
(8) 
APRIL, 1891. 
