NORTH AMERICAN HYMENOPTERA. 213 



The apical margin of the third abdominal segment entire or broadly sinuate. 



Holopyga. 

 Tarsal olaw with one small perpendicular tooth in the middle. 



Hedychridiuin. 

 Tarsal claws bifid at the apex^ without inner teeth Hedyclirnin. 



OinAL.US Jurine. 

 Nouv. Meth. Classer les Hym. 300, 1807. 



The occiput, disc of prothorax and mesothorax smooth, or with slight 

 indications of punctures ; front, anterior and lateral margins of protho- 

 rax, sides and the metathorax strongly punctured ; postscutellum rounded, 

 not projecting ; abdomen smooth, with sparse, very fine punctures ; apical 

 margin of third segment rounded, notched ; 2-6 teeth within the tarsal 

 claw. 



Two teeth within the tarsal claw, median lobe of mesothorax not strongly punc- 

 tured posteriorly. 

 Margin of third abdominal segment semi-transparent yellowish, broadest at 



apex iridesceus. 



Margin of third abdominal segment not semi-transparent yellowish, but con- 

 colorous with the segment. 

 Smoothed areas metallic blackish i^the color of antique bronze), without pur- 

 ple reflections; apical corners of second abdominal segment not project- 

 ing beyond, but even with the base of third segment diversilS. 



Smoothed areas blue and green, Avith purple reflections ; apical corners of 

 second abdominal segment projecting beyond the base of third segment. 



Iseviventris. 



Three to six teeth within the tarsal claw, median lobe of mesothorax not strongly 



punctured posteriorly. 



Lateral margins of third abdominal segment straight or unisinuate, apex on each 



side of notch rounded, not produced beyond line of margin, notch not 



forming a perfect semi-circle, but subangulated. 



Notch as deep as broad, angle less than 90° siniiOSUS. 



Notch much wider than deep, angle over 90° corruscans. 



Lateral margins of third abdominal segment bisinuate, the apex on each side 

 of the notch pointed, somewhat produced beyond the line of margin; 

 notch forming a semi-circle seniicirculBris. 



Omaliis iridesceus. 



Elavipus iridescens Norton, Trans. Am. Ent. Soc. vii, p. 234, 1879. 

 Elampus marginatus Provancher, Nat. Can. xii, 304, 1881. 



Eight specimens from Canada (Provancher's types), New Hampshire, 

 Pennsylvania and Colorado. They are all perfectly identical, except 

 varying in size from 3.5-4.5 mm. 



Ouialus diversus n. sp. — Without purple reflections, head and thorax 

 with the smoothed areas blackish, shining, the color of antique bronze, punctured 

 areas green; median lobe of mesothorax not strongly punctured posteriorly; ab- 

 domen polished, with green and slightly blue reflections on the lateral margins ; 



