~ 
new American Hymenoptera. 205 
first segment black, the red intruding into the black as a 
double notch. 
. Hab. Corvallis, Oregon, April 15, 1897. 
Received from Mr. Viereck. Named after Mr. C. Fowler, 
who has revised the Californian species of Nomada. 
Nomada Lewist, sp. n. 
2 .—Length 8 millim. 
Form ordinary ; ferruginous, the extreme lower corners of 
face, a very small spot on each side of first abdominal seg- 
ment (sometimes absent), a large spot on each side of second 
and third segments (often with a minute spot adjacent on the 
inner side), two spots and a band or four spots on fourth 
segment, and two spots on fifth segment bright yellow; patch 
enclosing ocelli, hindmost part of cheeks, spot on sides of 
prothorax, stripe on mesothorax, stripe on metathorax, stripe 
from wings to middle coxze, middle femora beneath at base, 
and hind femora and tibie behind suffusedly, all black. 
Mandibles simple; hair of face white in the middle, golden 
at sides; antennze entirely red, third joint barely shorter 
than fourth ; mesothorax dull and extremely closely punc- 
tured; scutellum not noticeably bilobed; tubercles and 
teoule reddish amber. Wings smoky, the pale patch distinct ; 
stigma ferruginous; nervures piceous; second submarginal 
cell much broader above than third. Hair on inner side of 
basal joint of hind tarsi mouse-colour ; abdomen with minute 
close inconspicuous punctures, its first joint without any 
black, its ventral surface without markings. 
Hab. Corvallis, Oregon, May 7, June 5; three specimens. 
Received from Mr. Viereck. Named after Meriwether 
Lewis, the explorer, 
Nomada oregonica, sp. n. 
9 .—Length 7-8 millim. 
Form ordinary ; dark ferruginous, a very minute mark at 
each lower corner of face, a spot on each side of second, third, 
and fourth abdominal segments (sometimes only on the second, 
or on the third and fourth and nearly obsolete on the second), 
two faintly indicated discal spots on the fifth, and two or four 
small spots on the ventral surface near the end yellow ; pattern 
of black markings as in N. Lewis?, but there are three black 
stripes on the mesothorax, the outer ones occasionally failing 
posteriorly, and the base of the first abdominal segment is 
black ; on the underside of the abdomen there are often three 
