150 ENTOMOLOGICAL SOCIETY 
1883: Fauna Ent. Can. Hym. p. 710, 715, n. 12, 9 (Megachile 
pt iva in part). 
1888: Add. Fauna Ent. Can. Hym. p. 462 (Megachile optiva 
in part). 
1898: Dalla Torre, Cat. Hym. v. X, p. 438, 9 (Provancher 
references to M. optiva in part.) 
One of the two female specimens under the number 877 
appears to be referable to Cresson's relatiua and has been com- 
pared with the type. 
The clypeus is slightly emarginate, mandibles apparently 4-toothed 
slightly interrupted band on dorsal abdominal segment 4, bands widely, 
interrupted on segments 2 and 3, missing on first segment (rubbed), 
edges of abdominal segments with dense pubescence; tarsal claws each 
with a sharp basal tooth. Recorded by Provancher from "St. Hyacinth, 
Cap Rouge, etc."; it is of course impossible to determine from which of 
these localities the above specimen was taken. 
Megachile leoni n. sp. 9 
Same references as above given under Megachile relati-va 
apply to this species, the specimen upon which it is founded 
being the other specimen of "Megachile optiva" in the Provancher 
collection. In general appearance it is near to relatwa. 
Length 9 mm. Pubescence of the insect white and yellow mixed 
(specimen very dirty) ; not as dense or as long on the clypeus as else- 
where, dorsal abdominal bands present and entire except on first seg- 
ment which has the band slightly interrupted, last dorsal segment with 
rather long black pubescence, other dorsal segments with scattering black 
hairs on the disk, pubescence of scopa coarse, short and yellow, of tarsi 
bright orange; punctuation close and coarse, on clypeus not so close nor 
so deep as on remainder of head; mandibles 5-dentate, teeth obsolete 
and irregular; clypeus entire; tegulae fuscous, wings slightly embrowned, 
transverse nervure before basal nervure; last two joints of front tarsi 
reddish, all the spurs reddish yellow, front claws with a distinct basal 
tooth; hind claws without, middle legs broken, first tarsal joint on 
posterior legs flattened, scarcely as broad at tips as at base, not subparallel. 
Cypophaga inermis Provancher. 
1882: L/e Naturaliste Canadien, v. XIII, p. 226, 229, n. 6, cJ 1 
(M. simplex Prov.) 
1883: Fauna Ent. Can. Hym. p. 710, 712, n. 6, of 1 (M. sim- 
plex Prov). 
1888: Add. Fauna Ent. Can. Hym. p. 323, n. 6, d\ p. 462, 
(M. inermis Prov). 
1896: Dalla Torre, Cat. Hym. v. X, p. 449 (M. simplicissima 
D. T.) 
