32 [April 



nate ; autennae rather longer than the head, black. Thorax dull blue- 

 green, densely and rather strongly punctured^ clothed with whitish 

 pubescence, which is more dense and longer on each side of the meta- 

 thorax and on the pleura ; tegulje black, tinged with purple, smooth 

 and shining. Wings fusco-hyaliue. Legs black, tinged with blue- 

 green, shining, clothed with pale hairs ; tarsi beneath with a pale yel- 

 lowish sericeous pubescence. Abdomen ovate, dark green, shining, 

 rather densely, uniformly and somewhat strongly punctured, the punc- 

 tures on the apical segment very dense and fine ; segments above clothed 

 with very short pale pubescence ; beneath, the ventral scopa is dense 

 and white. Lens-th 4 lines. 



Hah. — Connecticut. One specimen. Coll. Mr. E. Norton. 



Resembles 0. albivcnfris in size and form, but is distinguished bv 

 the punctation of the abdomen being much stronger and less dense ; 

 the punctation of the head and thorax is also stronger. The insect is 

 much less pilose, but much of the pubescence has apparently been 

 rubbed off. 



23. 0. proxima, n. sp. 



Mule. — Head green, densely and very finely punctured, clothed with 

 rather long whitish pubescence, which is very dense and white on the 

 clypeus ; antennas nearly as long as the thorax, black. Thorax dark 

 green, densely and very finely punctured, thickly clothed with long 

 whitish pubescence ; tegulas black, slightly tinged with green, smooth 

 and shining. Wings hyaline, apical margin faintly clouded ; nervures 

 blackish. Legs green or blue-green, clothed with short pale pubes- 

 cence. Abdomen green or blue-green, densely and very finely punc- 

 tured, the apical margins of the segments above smooth and shining ; 

 sides of the basal segment above thinly clothed with whitish pubes- 

 cence ; the remaining segments with a very short sparse pale pubes- 

 cence; the apical margin of the sixth segment is produced, reflexed 

 and notched in the middle, and that of the apical segment is very 

 deeply notched in the middle. Length 3^ lines. 



Hab. — Maine and Fort Grood Hope, Mackenzie River, British Ame- 

 rica. Two specimens. Coll. Mr. E. Norton. 



Resembles the males of 0. albiveiitris, but the apical margin of the 

 sixth abdominal segment in that species is entire. 



