22 [April 



7. 0. chalybea. Smith. 



Osmia chalybea. Smith, Brit. Mus. Cat. i, p. 143. (1854.) 



" Female. Length lines. — Steel-blue, head very large, subquadrate 

 and strongly punctured, the abdomen more finely so; the anterior mar- 

 gin [of the clypeus] produced iu the middle, the apex of the lobe 

 emarginate, the margin on each side crenulated ; the mandibles very 

 large, a deep groove running along their inferior margin from the apex 

 to the base, where it terminates in a pit or hollow. Thorax, the sides 

 thinly covered with griseous pubescence ; beneath densely clothed with 

 black pubescence. 



•' Male. — Closely resembles the female, the margin of the clypeus 

 in this sex is entire, and the margin of the apical segment notched in 

 the middle ; beneath, the ventral segment bidentate. 



.. Hab.—^i. John's Bluff, East Florida." 



One 9 specimen of this fine insect, from Florida, is in the collection 

 of Mr. Edward Norton. I have not seen the male. 



S. 0. lignaria, Say. 



Osmia lignaria, Say. Bost. .Journ. Nat. Hist. i. p. 'M'J % ?. (1837.) 



Female. — Head large, subquadrate, bluish-green or dark blue, finely 

 and densely punctured, cheeks and vertex clothed with black pubes- 

 cence, that on the face is long, somewhat dense and whitish, sometimes 

 slightly mixed with black; anterior margin of the clypeus produced 

 and deeply emarginate ; mandibles stout, deeply channelled along the 

 outer margin, and having a prominent tubercle on each side at base ; 

 antennse longer than the head, black. Thorax bluish-green or dark 

 blue, finely and densely punctured, clothed with rather long pubes- 

 cence, which is whiti.sh slightly mixed with black above and entirely 

 black beneath ; disk with a finely impressed longitudinal line ; tegulge 

 black, smooth and shining. Wings subhyaline, almost hyaline, the 

 apical margins and the costal half of the marginal cell tinged with 

 fuliginous Legs black, with black pubescence, that on the femora 

 beneath sometimes pale. Abdomen subglobose, bluish-green or dark 

 blue, rather densely and finely punctured, shining; the basal segment 

 above and often the basal half of the second segment clothed with pale 

 pubescence, the remaining segments with rather short black pubes- 

 cence; beneath, the ventral scopa is den.se and black. Length 4-6 lines. 



Male. — Closely resembles the female, but is smaller and more paral- 



