XORTH AMERICAN HYMENOPTERA. 
59 
Engenia bidbosa, Salix cordata and Erythroniimi albidum. I have 
taken the sexes in copula on flowers of Salix, April 10th. 
A. Forbesii 9 . — Black; clypeus closely aud strongly punctured, basal 
jirocess of labrum broad ; thorax rather closely and strongly punctured, like the 
clypeus, thinly clothed with short fulvous pubescence, enclosure of metathorax 
bordered by a strong rim, truncate posteriorly; wings hyaline, apical margins 
somewhat clouded, nervures and stigma dull testaceous, tegulsB piceous, dull tes- 
taceous exteriorly; legs black, apical joints of tarsi ferruginous; abdomen 
closely punctured, especially on basal half of segments, segments 2-4 depressed 
to the middle, bearing apically narrow fascite of white pubescence, interrupted 
broadly on the second, narrowly on the third, anal fimbria dull ferruginous. 
Length 10 — 11 mm. 
Twenty females taken from Aj)ril 7th to June 14th, on flowers of 
Stellaria media, Claytonia virginica. Pranas serotina, Amelanchier 
canadensis, Pastinaca saliva, Heracleum lanatum, Erigenia bulbosa 
and Salix humilis. 
Dedicated to Prof. S, A. Forbes. 
\. claytonise 9 - — Black; clypeus closely aud strongly punctured, often 
with a median impunctate line, basal process of labrum rather long and narrow, 
emarginate or notched at tip ; thorax rather sparsely punctured with rather fine, 
shallow punctures, thinly clothed with short, pale fulvous pubescence, enclosure 
of metatborax rough with strong longitudinal rugfe, with a poorly defined bor- 
der; wings hyaline, nervures and stigma honey-yellow, tegulse dull testaceous 
exteriorly, second submarginal cell receiving the first recurrent uervure near its 
apex ; legs black, inclining to dull ferruginous, the tarsi more or less yellowish, 
the hind tarsi and sometimes the hind tibise yellowish ; abdomen finely and 
rather sparsely puuctured, the apical one-third of each segment depressed, seg- 
ments 2-4 with apical fasciae of w'hitish pubescence, interrupted on the second, 
anal fimbria pale fulvous. Length 8 — 10 mm. 
'J, .— Resembles the female; the tarsi, and often the posterior tibiae, yellowish 
testaceous. Length 7 — 8 mm. 
Twenty females, eleven males, taken from April 10th to June 4th, 
on flowers of Claytonia virginica, Cercis canadensis, Amelanchier 
canadensis, Zizia aurea, Heracleum lanatum, Antennaria plantagiiii- 
folia and Salix cordata. 
Two female specimens have the wings with two submarginal cells. 
One male is infested by Stylops. 
A. nubecula Sm. 
One female, taken October 9th, on flowers of Aster. 
