NORTH AMERICAN HTMENOPTERA. 231 



D. — Apical margin of abdomen tridentate. 



Poetseutellum rounded posteriorly, not produced Doriae. 



Postseutellum conical, produced posteriorly psrvula. 



Chrysis Doriae Gribodo, Ann. Mus. Genov. vi, p. 369, 1875.— " Similar to 

 C. cyanea L., as to character {?), but is readily distinguished by its entire anus; 

 slender green-blue, somewhat shining; head and thorax somewhat thickly punc- 

 tured ; abdomen sparsely and moderately punctured : third segment distinctly 

 narrower at the apex than at the base, curved, subtruncate; anteapical series 

 moderately abrupt, distinctly interrupted in the middle, foveolse obliterated. 

 Length of body 4.5 mm. Habitat Boreal America." 



Translated from Gribodo's description. The collection does not con- 

 tain this species. The character given in the above table for C. Doriae 

 is taken from Dahlbom's table as relates to C. cyanea^ viz. : " Postseu- 

 tellum muticum," and is assumed for this species because Gribodo's de- 

 scription reads " similar to C. cynnea''' with no difference as to the post- 

 seutellum mentioned. 



ChrysiN parviila Fabr.. Syst. Piez. 176, 1804; Dahlb., Hym. Eur. ii, 191, 



tab. X, 106; Norton, Trans. Am. Ent. Soc. vii, 242. 

 Ckrysis carinata Say, Ann. Macl. Lye. i, 82, 1828. 

 Chrynis tridens Lep. et Serv. Encycl. x, 495, Pyria; Brulle, Nat. Hist, des 



Ins. Hym. iv, 46, 1846. 

 Chrysis mucronata Brulle, loc. cit. 45, 1846 ; Norton, Trans. Am. Ent. Soc 



vii, 242. 

 Chrysis ?>-dentata Dahlb., Dispos. 15, 22, 1845. 

 Chrysis virens Cresson, Proe. Ent. Soc. Phila. iv, 309, 1865. 



The forms of parvula and mncronata have no constant characters to 

 separate them. The carina across the front is sometimes entirely without 

 the upward branches, and there is every intermediate form between this 

 and two strong branching carina on each side, one near the anterior 

 ocellus. Other specimens have the inner carina strong, the outer hardly 

 present. There is also no difference in the projection of the metathorax 

 as mentioned by Brulle. There is a considerable variation in the relative 

 size of the apical teeth, the outer ones in some specimens being only 

 sharp angles of 100° and the median tooth short, while in others the 

 outer teeth are well produced and the median one long and slender, some- 

 times a little bent down ; also all forms between these extremes. The 

 color is from dark blue with purple and some green reflections to emerald- 

 green with no blue or purple. The anteapical series of pits differ in size 

 and shape. Varies in size from 7-11 mm. United States and Mexico. 

 In all fifty-three specimens, including the type of virens Cresson, which 

 does not differ. 



