NORTH AMERICAN HYMENOPTERA. 225 



Sub-family— CHRYSIDIN.^. 



Head as broad, or broader than the postscutellum; space between the eyes on 

 the face as wide as the distance between the base of antennse and the vertex ; the 

 carina transverse, not forming a basin on the vertex ; postscutellum rounded pos- 

 teriorly ; first abdominal segment rounded, not carinated on the sides; second 

 segment about twice as long on the dorsum as on the sides, its posterior margin 

 about straight in the middle, convex laterally Chrysis. 



Head small, much narrower than the postscutellum ; space between the eyes, 

 on the face, narrow, not half as wide as the distance between the base of antennae 

 and the vertex ; the carina extended upward, surrounding the anterior ocellus, 

 forming the margins of a distinct basin, much in shape of a horseshoe; postscu- 

 tellum partly hidden, projecting into a subconical piece, which is strongly exca- 

 vated ; first abdominal segment flattened on the sides, causing a short, oblique 

 carina above; second segment more than three times as long on the dorsum as on 

 the sides, its posterior margin greatly convex equally Stilbum. 



CHKYSI^ii Liune'. 

 Syst. Nat. ed. xii, vol. i, p. 947, 1767. 



In this genus the differences in the form of the apical margin of the 

 third abdominal segment seems to be only of suhgeneric importance as 

 subordinate to the generic distinction. Five and i^even dentate forms 

 are represented by certain exotic species. Chrysis amctna Eversm., 

 belonging to the former, is described and figured by Radaskovsky in 

 Horse Soc. Ent. Ross, iii, 295, and Frederic Smith has described species 

 with five and seven teeth in Trans. Ent. Soc. London, 1874, 460-462. 

 I have examined specimens from Africa of the allied genus Pyria, of 

 which so far we have no representative in North America. 



Our subgenera are thus characterized : — 



Apical margin of abdomen entire * A. 



notched B. 



unidentate (unilobed) C. 



tridentate I>, 



bidentate E, 



quadridentate F", 



sexdentate O. 



A. — Apical margin of abdomen entire. 



Abdomen dark red, with green, purple and golden reflections luartia. 



Abdomen colored as the thorax, green, or blue and purple. 



Posterior corners of the margin of third segment rounded, even, not produced. 

 An arched carina across the front of the head immediately above the basin of 



face, which is striated Terticalis. 



Front without carina, basin of face punctured. 

 Posterior lateral angles of the metathorax subobtuse, not produced. 



TRANB. AMKB. ENT. SOC. XH. (33) NOVEMBER, 1885. 



