OF WASHINGTON. 159 
rowed above, both recurrent nervures entering cell at about equal distances 
from apex and base, transverse median nervure only slightly before 
the basal nervure, veins brownish, wings slightly clouded. 
The single cT is numbered 1 1 69 and recorded by Provancher 
from Cap Rouge. 
Nothomsia exigua (?) Cresson. 
1888: Add. Fauna Can. Knt. Hym. p. 326,6^ p. 339, 466 
(Osmia exigua). No specimens of this species were sent for 
examination and it is very doubtful if the species was correctly 
recognized. The "Osmia parva" Prov. would come the nearest 
to the species of any specimens I have seen from Canada. 
Monumetha albifrons (Kirby). 
1837: W. Kirby, Fauna Bor.-Amer. v. IV, p. 270, n. 374, cJ 1 . 
1882: Le Naturaliste Canadien, v. XIII, p. 227, 240-241, 
n. 10 (Megachile oblonga). 
1882: Le Naturaliste Canadien, v. XIII, p. 226, 230, n. 
9, 9 (Megachile oblonga). 
1883: Fauna Ent. Can. Hym. p. 714, n. 9, 9 (Megachile 
oblonga) . 
1888: Add. Fauna Ent. Can. Hym. p. 324, 326, n. 9, p. 467 
(Osmia oblonga).. 
1896: Dalla Torre, Cat. Hym. v. X, p. 404, 9 (Osmia 
oblonga) . 
There is in the Provancher collection the type of Osmia 
oblonga Prov., a single 9 specimen numbered 962, that is a well 
marked specimen of Cresson's "Monumetha argentifrons," 
which species I now believe to be synonymous with Kirby's 
Chelostoma albifrons. This last named species was described 
from one male captured in latitude 65, North America. I 
have recently examined specimens collected by Merritt Cary 
of the Division of Biological Survey, U. S. Department of 
Agriculture, at Ft. Resolution, Great Slave Lake, Mackenzie 
Ter., Dom. of Can., 26 June, 1903, which answers to Mr. Kirby's 
description so closely that I cannot do otherwise than consider 
them to belong to albifrons. Both 9 9 and c? cT are repre- 
sented and a comparison with other specimens of the genus 
Monumetha gives no good specific differences. It will be 
recalled that Mr. Cresson noticed the resemblance between 
his M. borealis (Great Slave Lake) and Kirby's species. 
Monumetha imperfecta Provancher, 1896. 
1896: Le Naturaliste Canadien, v. XXIII, p. 9, n. i, 9- 
I have not seen the type of this species which was collected 
at Los Angeles, Cal., by Mr. D. W. Coquillett. The specimen 
