OF WASHINGTON. 155 
1883: Fauna Ent. Can. Hym. p. 689, 716 (Gnathocera, 
type cephalica). 
1888: Add. Fauna Ent. Can. Hym. p. 323 (same ref .) 
1896: Dalla Torre, Cat. Hym. v. X, p. 417 (as a syn. of 
Megachile) . 
1903: Robertson, Tr. Amer. Ent. Soc. v. XXIX, p. 167,- 
172 (Ceratias, type pugnata). 
It is rather unfortunate that this genus should have had 
two preoccupied names given to it. Gnathocera was used by 
Kirby in 1825 for a genus of Coleoptera; Ceratias was used by 
Kroy in 1845 for a genus of Fishes. 
Say apis pugnata Say. 
1882: Le Naturaliste Canadien, v. XIII, p. 233, 9 (Gnatho- 
cera cephalica); p. 226, 228-229, n. 5, cT, 9 (M. pugnata). 
1883: Fauna Ent. Can. Hym. p. 710, 712, n. 5, cT 9 (M. 
pugnata); p. 716, 9 (Gnathocera cephalica). 
1888: Add. Fauna Ent. Can. Hym. p. 323, n. 5, p. 462 
(makes G. cephalica a syn.). 
1896: Dalla Torre, Cat. Hym. v. X, p. 445 (M. pugnata, 
Prov. references and G. cephalica which he makes a syn. of 
pugnata) . 
I have seen but one pair of this species, they are numbered 
196 (or 961). Provancher reports the species from Cap Rouge. 
It is of course impossible to state which of the references are 
applicable to these particular specimens, but since Provancher 
himself made Gnathocera cephalica a synonym of M . pugnata 
we may feel assured that the originals were carefully com- 
pared. 
OSMUND. 
Osmia lignaria Say. 
1882: I/e Naturaliste Canadien, v. XIII, p. 207-208, n. i, 
9, <?. 
1883: Fauna Ent. Can. Hym. p. 707, 708, n. i, 9, cT. 
1888: Add. Fauna Ent. Can. Hym. p. 466. 
1896: Dalla Torre, Cat. Hym. v. X, p. 410, 9 (Provancher 
references) . 
I have examined 9 9 numbered 867 and labelled Osmia 
lignaria. No specimens of the c? were seen. 
Osmia simillima Sm. 
1883: Fauna Ent. Can. Hym. p. 812, n. 6, 9 (Osmia atriven- 
tris) . 
1888: Add. Fauna Ent. Can. Hym. p. 466 (Osmia atriven- 
tris). 
