AMERICAN HYMENOPTERA. 235 



up, this doubtless belongs to the division Elam'pus of authors. The 

 postscutel is elevated into a cone, with two punctures on the summit. 

 The sides of the abdomen are pinched, sinuate. 



Elampus versicolor n. sp. — % . — Color green varying to blue in different 

 lights, tarsi yellow,- wings almost hyaline, their apical third faintly clouded ; 

 basin of face wide and with bent cross striae; punctures on occiput and pro- 

 thorax nearly as large and abundant as elsewhere ; postscutel elevated into a 

 large, flattened, punctured spine; tergum roughened, but with no distinct 

 punctures; basin at the base of first segment wide, shallow, with a little tooth 

 on each side; apical segment much pinched at sides, its turned up apical 

 membrane yellowish ; claws with three inner processes. Length .18 inch. 



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



Elampiis viridicyaneas n. sp. — 9. — Color green, with the occiput, 

 middle of thorax and of tergum violaceous; wings hyaline, with the apical 

 half of upper pair obscure; basin of face wide, touching eyes and with cross 

 striae; postscutel produced into a flattened spine; basin of first segment of 

 tergum shallow, wide, with a little tooth on each side; first and second seg- 

 ments covered with small distinct punctures, larger on sides and on third 

 segment; sides of third segment pinched, notch rather large, lateral margin 

 bisinuate; claws with four inner processes. Length .18 inch. 



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



Elanipus viriclis Cresson, Proc. Ent. Soc. Phil, iv, 1865, 103. 

 Hah. — Cuba, (Coll. Am. Ent. Soc.) Basin of face not striate; the 

 occiput and prothorax shining, with subobsolete punctures; the post- 

 scutel produced, flattened, subtruncate; the first and second segments 

 of tergum with fine, separated punctures, the third segment roughened ; 

 claws without apparent teeth. 



HOI.OPYGA Dahlb. 

 Dahlbom classes this genus with his Elampidae, on account of its 

 three toothed mandibles and its pectinate claws. Externally it pre- 

 sents exactly the same appearance as HedycTirum. 



Holopyga ventralis. 



Hedychrum ventralc Say, Long's 2d Exp. App. 330, 1, 1824. 

 Holopyga Dohrni Dahlb., Hym. Eur. ii, 48, 24, 1854. 

 Holopyga compacta Cresson, Proc. Ent. Soc. Phil, iv, 304. 



Hah.— IS. Y., N. J., Del, 111., Cuba, (Coll. Am. Ent. Soc.) Numer- 

 ous specimens, all females. 



Specimens vary much in color, some being mostly green, and some 

 greenish-blue, with purplish bauds on the tergum when it is much 

 bent. The apex of the third abdominal segment has a wide shallow 



