No. 22.] HYMENOPTERA OF CONNECTICUT. 603 



O. sinuosus Say. 



Length 3-4 mm. 



Thompson, 11 July, 1905 (H. L. V.). 



Notozus Foerster. 

 Key to Species. 



Snout-like projection of abdomen not projecting distinctly 

 beyond line of margins of third segment viridicyaneus 



Snout-like projection of abdomen distinctly projecting be- 

 yond line of margins of third segment marginatus 



°N. viridicyaneus Norton. 

 Length 5-6 mm. 

 N. marginatus Patton. 

 Length 3-5 mm. 

 Thompson, 11 July, 1905 (H. L. V.). 



Hedychridium Perrin. 



But one species is known from the state. 



H. dimidiatum Say. 



A triangular area below the postscutellum ; pro- and meso- 

 thorax with close equal punctures. 



Branford, 4 July, 1905 (H. W. W.) ; Rockville, 23 August, 

 I905(H.L.V.). 



Hedychrum Latreille. 

 Key to Species. 



Head and thorax above with smoothed areas and sparse 

 punctures obsoletum 



Head and thorax above with no smooth areas; blue and 

 purple to emerald-green violaceum 



H. obsoletum Say. 

 Length 5.5 mm. 



New Haven, 13 June, 1902 (E. J. S. M.), 6 July, 1904 

 (P. L. B). 



H. violaceum Brulle. 



Length 7.5 mm. 



Scotland, 10 August, 1905 (B. H. W.). 



