1864.] 37 



acute ; antennae about as long as tlie head, black. Thorax black, 

 closely and finely punctured, densely clothed with long ochraceous 

 pubescence; tegulae black, finely punctured, shining. Wings subhya- 

 line. apical margins faintly clouded, nervures black. Legs black, 

 clothed with blackish pubescence, the tarsi beneath, with fuscous pu- 

 bescence. Abdomen short, globose and finely punctured, black, sub- 

 opaque ; basal segment above clothed, especially on the sides, with long 

 ochraceous pubescence, the remaining segments clothed with short fus- 

 cous pubescence, which appears ochraceous in certain lights, especially 

 on the apical segment; beneath, the ventral scopa is dense and black. 

 Length 3f lines. 



Hah. — Great Slave Lake, British America. One specimen. Coll. 

 Smithsonian Institution. 



A small robust species, remarkable for its short globose abdomen. 



.32. 0. rustica, n. sp. 



Male. — Head large, subquadrate, as wide the thorax, bronze-green, 

 densely and finely punctured, clothed with long bright rust-red pubes- 

 cence, which is dense and yellowish beneath the antennae, that on the 

 cheeks beneath pale yellowish-white ; antennae longer than the head, 

 black. Thorax bronze-green, very closely and finely punctured, densely 

 clothed above with long bright rust-red pubescence, beneath it is yel- 

 lowish-white and rather thin ; tegulae brassy -black, smooth and shin- 

 ing. Wings hyaline, apical margins faintly clouded ; nervures black- 

 ish. Legs greenish-black, clothed with rather long pale yellowish 

 pubescence ; apical joints of the tarsi rufo-testaceous. Abdomen short, 

 globose, bright bronze-green, shining, finely and densely punctured, 

 clothed above with bright rust-red pubescence, which is rather long on 

 the basal segment, and dense on the apical margins of the segments, 

 especially the terminal ones ; apical margin of the sixth segment 

 strongly sinuate on each side and rather deeply notched in the middle ; 

 apical segment bidentate ; beneath, the pubescence is thin and pale. 

 Length 8} — 'i\ lines. 



llah. — Easton, Penn. Three % specimens. Coll. Mr. E. Norton. 



This is a beautiful little species ; its form is short and robust, and 

 may be at once distinguished from all other species known to me by 

 its bright rust-red pubescence which is dense on the thorax and face, 

 and the brassy-green color of the abdomen. The name I have adopted 



