58 
CHARLES ROBERTSON. 
tcKulse dull testaceous; legs black, posterior tarsi inclining to ferruginous ; ah- 
donien shining, finely and sparsely punctured, segments depressed to the base, 
not fasciate, anal fimbria fulvous. Length 9 — 10 mm. 
Eight females, taken from April 2d to .June IGtli, on flowers of 
Staphylea trifolia, Primus serotiaa, Pastinaca saliva, Erigenia hulbosa 
and Salix cordata. 
A. rugosa J. — Black; clypeus closely and strongly punctured, basal pro- 
cess of labrum broad, rather long, truncate; thorax closely and very coarsely 
punctured, thickly clothed with short fulvous pubescence, enclosure of meta- 
thorax bordered by a salient rim, truncate posteriorly, bearing sharp longitudinal 
ridges ; wings hyaline, apical margins faintly clouded, nervures, stigma and 
teguljB testaceous; legs dull ferruginous, apical joints of tarsi paler; abdomen 
smooth and shining, densely and finely punctured, segments depressed nearly to 
the base, the depressed portions of the segments more sparsely punctured, fascise 
wanting, except on the extreme sides, anal fimbria fulvous. Length 9 — 10 mm. 
%. — Eesemhles the female; less strongly punctured, thorax with the puhes- 
cence longer and thinner, antennse as long as thorax, enclosure of metathorax 
not so well defined, segments of abdomen not depressed beyond the middle, third 
and fourth segments with continuous a])ical fasciae of pale fulvous pubescence. 
Length 7 — 8 mm. 
Twelve females, sixteen males, taken from April 2d to 21st, on 
flowers of Dentaria laciniata, Cluytonia virginica, Xanthoxylum arner- 
icamim, Amelanchier canadensis, Erigenia htdbosa, Salix cordata and 
S. humilis. The sexes were taken in copula on Erigenia, April 6th. 
A. luarito 9 ■ — Black, the abdomen red ; clypeus closely and sti'ongly punc- 
tured, basal process of labrum long and narrow ; flagellum dull testaceous be- 
neath ; thorax rather closely and strongly punctured, much more coarsely than 
the clypeus, clothed with thin pale pubescence, enclosure of metathorax bounded 
by a salient rim, rounded posteriorly, with sharp longitudinal ridges; wings 
hyaline, apical margins faintly clouded, nervures and stigma testaceous; tegulse 
piceous, with a dull testaceous spot; legs black, inclining to dull ferruginous, 
apical joints of tarsi j>aler, hind tihise and tarsi sometimes testaceous; abdomen 
smooth and shining, rather closely and finely punctured, segments depressed 
beyond the middle, red, the apical margins of the segments and the apical seg- 
ments more or less blackish, the second segment has a black spot at base on each 
extreme side, the segments have an apical patch of white i)ubescence on each 
extreme side, anal fimbria brownish. Length 9 — 10 mm. 
'J, .—Eesemhles the female; the pubescence often more fulvous; the abdomen 
is black, commonly with a little red about the ventral surface of the first and 
second segments, but a male which I took in copula with the female shows no 
red about the abdomen. Length 7—8 mm. 
Seventeen females, eight males. One female speeimen, which I 
am satisfied belongs to this s})ecies, has the abdomen black, except a 
little red at the sides of the first and second segments. I have found 
this bee from Aj)ril 2d to 20th on flowers of Amelanchier canadensis. 
