AMERICAN HYMENOPTERA. 239 



Hetlyohrinn cseriileum n. sp. — 9. — Color greenish-blue; tegulse and 

 two basal joints of antennfe the same; tips of tibiae and tarsi brown; wings 

 faintly clouded; basin efface punctured, feebly striate near antennse; anterior 

 edge of clypeus straight; mandibles small, with no perceptible inner teeth ; 

 head and thorax closely punctured ; postscutellum short, triangular, conical, 

 its hinder angle elevated, the first foveola longer than wide, reaching the 

 summit of cone, the second large, almost coalescing with that on the other 

 side; tergum covered with close numerous little punctures, apex rounded; 

 venter closely punctured. Length .16 inch. 



Hah. — Dacota, (Coll. Am. Ent. Soc). One specimen. 



Hedychruiu Cressoni n. sp. — 9. — Color green, changing into blue- 

 black at apex of and across mesothorax, and at base of each segment; bright 

 green beneath ; a violaceous stripe connecting the summit of eyes back of the 

 ocelli; basal half of wings hyaline, apical half clouded, darkest near stigma; 

 the three basal joints of antennse, venter and legs, green ; basin of face shining, 

 polished near antennse, the upper third with cross striae; head and prothorax 

 covered with coarse, separated pits, closer on the head; scutel continued in the 

 form of a frustrum of a cone beyond the ordinary polished foveolse on each 

 side; basin at base of second abdominal segment abrupt, nearly as wide as 

 segment, polished; tergum covered with small distinct punctures across the 

 apex of each segment, and coarser at sides; margin of third segment lightly 

 notched, and very obtusely bent at sides; inner margin distinctly hollowed, 

 with a defined basin from the notch half across the segment; claws with a 

 strong inner tooth and a distinct tooth at base. Length .48 inch. 



Hob. — Mexico, (Coll. Am. Ent. Soc.) One specimen. 



CHRYSIS Linn.s 

 Sec. I. — Margin of third abdominal segment ronjided^ the angles or 

 corners on each side rounded or very obtusely angrdate. 



No carina across the basin of face below the ocelli. 



Apical margin of third segment rounded, flattened at apex, corners rounded; 



ante apical series of pits ending near the angles liilaris, % . 



Apical margin subtruncate. 



An obtuse angle on each side, not sharply defined; ante-apical series of 

 pits ending near the base of segment; the pits near the middle longer 



than wide pacifica, 9. 



An obtuse well defined angle on each side, the margin between the angles 



sinuate integer, 9. 



A carina across the basin of face,, the basin with cross strise striatellus. 



Clirysis Itilaris Dahlb., Hym. Eur. ii, p. 103, 56, 1854. 

 Hab. — Canada, Connecticut, (Coll. Am. Ent. Soc.) 



* The colors of most of our species are green, changing into blue or violaceous. 

 Almost invariably when the insect is rolled up into a ball or bent, violaceous 

 bands are seen across the tergum and shoulders. "When the insect is not bent 

 these disappear beneath other parts of the body. Many describers seem to be 

 ignorant of this, and cause great confusion in their haste to make new species. 



