THE CANADIAN ENTOMOLOGIST. 271 



Osmia atriventris Cresson. 

 Nerepis, Aug. 18, 20, 22, seven females. 



Osmia melanotricha Lovell & Cockerell. 

 Nerepis, Aug. 20, 22, four females. 



As represented by this series, in this region the present species 

 is larger than the preceding. 



Megachile infmgilis Cresson. 

 Nerepis, July 19, one female. Det. by Mr. Viereck. 



Megachile melanophcBa Smith. 

 Nerepis, July 19, 22, Aug. 18, 22, fifteen males. Det. by Mr. 

 Viereck. 



Megachile vidua Smith. 

 Nerepis, July 19, 22, Aug. 22, five females; July 22, one male. 

 St. John, July 14, four females; July 14, one male. Det. by 

 Mr. Viereck. 



Perdita octomaculata Say. 

 St. John, Sept. 9, one female. 



Panurginus asteris Robertson. 

 St. John, Sept. 9, three males; Sept. 8, 9, ten females. 

 Nerepis, Aug. 18, 19, 22, twenty males; Aug. 18, Sept. 8, four 

 females. Det. by Mr. Viereck. 



Calliopsis andreniformis Smith. 

 Nerepis, Aug. 20, 22, four females; July 24, Aug. 20, 22, five 

 males. 



Augochlora confiisa Robertson. 

 Nerepis, July 24, Aug. 19, two females; Aug. 22, one male. 

 St. John, Sept. 9, si.x females; Sept. 8, 9, four males. 



Halictus albipennis Robertson. 

 St. John, Sept. 9, three females. 

 Nerepis, July 22, one female. 



Halictus arcuatits parisus Lovell. 

 St. John, Sept. 8, two females; Sept. 8-, 9, 18, twenty males. 

 Nerepis, Sept. 9, one female; Sept. 8, 9, si.x males. 



Halictus coriaceus Smith. 

 St. John, Sept. 9, Oct. 3, two males. 

 Nerepis, Sept. 8, one female; Sept. 8, 9, four males. 



