AMERICAN HYMENOPTERA. 237 



Postscutellum connecting abruptly with the short dividing ridge of the meta- 

 thorax. 

 Claws with a strong inner tooth. 

 Basin of face striate. 

 Apex of third abdominal segment lightly notched, obtusely angulate at 

 sides, sinuous at base. 



Three basal joints of antennse green Cressoni. 



Basal joint of antennse green. 

 Tergum polished, punctures moderate, numerous, separated; head 



narrower than thorax IiOuisia.lli£e. 



Apex of third segment not emarginate, sides obtusely angulate. 

 Two basal joints of antennae green. 



Punctures of 3rd segment scarcely larger than 2nd Tiola-Ceiim. 



Punctures of apex of second and surface of third segments large, 



surface rugose asperum. 



Claws with a feeble inner tooth. 



Basin of face punctured, feebly striate near the antennae; postscutel short, 

 its basal angle prominent, acute; tergum and venter with moder- 

 ate, dense punctures cseruleum. 



Hedychrum obsoletnm Say, Bost. Jour, i, 1835, 284, 1, 9. 



Hedychrum Zimmermajini Dahlb., Dispos. 1845, 2, 1; Hym. Eur. ii, 61, 82. 



Hah. — Penn., 111., (Coll. Am. Ent. Soc.) ; Iowa, (Say). In punc- 

 tures and color, this is much like Elamjnis sinuosum Say, but has less 

 of purple. The back of the head fits closely upon the thorax, so that 

 the separation is hardly visible. 



HeclychruiK Wiltii Cresson, Proc. Ent. Soc. Phil, iv, 1865, 305, %. 

 Hah. — Colorado, (Coll. Am. Ent. Soc.) This is the largest species 

 of the genus yet described in this country. Color greenish-blue, with 

 violaceous reflections. Length .50 inch. 



Hedychrnin cupricolle Cresson, Proc. Ent. Soc. Phil, iv, 1865, 305, 9 . 

 Hah. — Colorado, (Coll. Am. Ent. Soc.) The only species yet dis- 

 covered here, with cupreous or golden colors; the whole thorax above 

 is of this character. Length 4 lines. 



Hedychrnm vernale Cresson, Proc. Ent. Soc. Phil, iv, 1865, 104, % . 

 Hah.— Cuha, (Coll. Am. Ent. Soc.) 



Hedycliruin cyaniventre Cresson, Proc. Ent. Soc. Phil, iv, 1865, 104, '^ . 

 Hah.— Cuba, (Coll. Am. Ent. Soc.) 



Hedychrnm diinidiatuui Say, Long's 2d Exp. ii, 331, 2, 1824. 



^a6.— Conn., N. Y., Pa., Del., Va., (Coll. Am. Ent. Soc.) This 

 species may readily be known by the striae which do not cross the 

 basin of face, and the punctured area beneath the postscutel; the 

 tergum has variable violaceous tints, the apex of the final segment is 

 broadly rounded. Length % $ .28 inch. 



