OF WASHINGTON. 151 
This species is very closely related to M. montivaga Cresson 
and I have deemed it advisable to give a rather full descrip- 
tion of the one specimen. The species was first named M. 
simplex by Abbe Provancher, but in 1888 he renamed it M. 
inermis, doubtless having become aware that Smith in 1853 
had also described a M . simplex. Dalla Torre evidently over- 
looked this name M. inermis and renamed the species M. 
simp lids sima . 
Form subparallel; pubescence mostly white, some black hairs on upper 
part of cheeks near eyes and on dorsal abdominal segments where it is 
rather dense, pubescence of thorax white somewhat mixed with ochra- 
ceous on the dorsum, face and cheeks with long white hairs, tarsi clothed 
with yellowish pubescence, dorsal abdominal bands close and appressed, 
absent on first segment, widely interrupted on second segment (rubbed?), 
first and second segments clothed with a loose gray pubescence; punc- 
tuation regular and close, that on scutellum exceedingly close rather 
large and with the ground surface tessellated; head very broad and 
extending well behind the eyes, antennae simple, with a tendency to be 
crenulated beneath, fuscous beneath; mandibles long, subparallel, black 
with a red band across outer tooth and on inner teeth at tips, 3-toothed, 
first tooth long and sharp, middle tooth shortest, a long, flattened, rounded 
and turned inward at tip, basal tooth, cheeks apparently not armed; 
labrum truncate at tip (in pugnata it is notched); tegulae reddish-black; 
a central smooth slightly elevated line on anterior mesothorax, wider 
posteriorly and reaching almost from tegulae to apical margin; transverse 
nervure interstitial; femora reddish inside; claws cleft, with an enlarge- 
ment but no basal tooth; 6th dorsal segment with a prominent carina, 
shallowly, broadly emarginate, apical carina thin and almost obsolete, 
lateral teeth flattened in axial plane of body and bent inward, round at tip, 
yth segment produced and with a faint emargination at tip ; no coxal spines. 
Redescribed from one 9 specimen numbered 873, and 
recorded by Provancher. 
Megachile vancouverensis Provancher. cT. 
1888: Add. Fauna Ent. Can. Hym. p. 425, n. 3, p. 457. 
1896: Dalla Torre, Cat. Hym. v. X, p. 451. 
In shape very much like M. avara Cresson, but is wider, has 
more pubescence on abdomen, thus making it appear grayer. 
Pubescence long and white, mixed with brown on the vertex and on 
front of thorax almost back to tegulae, short black hairs on outer orbits 
of eyes, reaching about half way from vertex to base, cheeks back of 
this portion have some black hairs mixed with short white ones, segments 
3, 4, 5 with more or less brown or black hairs on dorsum; middle tarsi 
densely clothed above and hind tarsi beneath with short yellow pubes- 
cence, some black hairs above on all the tibiae; pubescence of all the 
femora long and white, first four joints of tarsi fringed with long white 
hairs, some of which have brown tips, first joint concave, yellowish red 
