NORTH AMERICAN HYMENOPTERA. 223 



metathorax green, with large, shallow, close punctures; postscutellum 

 followed by or extended into a small punctured area on the metanotum, 

 which in turn ends in a median ridge ; foveolae at sides triangular and 

 with the extreme base of spines transversely striated ; abdomen polished, 

 very finely and sparsely punctured, deep blue and violaceous purple, with 

 slight crimson reflections in certain lights. A very distinct species on 

 account of the lack of punctures on certain portions ; 5.5 mm. long. 

 IIedyf*hriiili cnpricolle Cresson, Proc. Ent. Sof. Phila. iv, 305, 1805. 

 Three specimens from Colorado (two of which are Mr. Cresson's 

 types). Densely and rather finely punctured on the head and thorax, 

 excepting the scutellum and postscutellum, which have the punctures 

 larger ; abdomen with the punctures a little separated, but on some por- 

 tions becoming contiguous. In the types the head, sides, legs, metanotum 

 and abdomen are emerald-green with a little blue, the entire dorsum of 

 thorax bright coppery red, the postscutellum a little green ; 7.5 mm. 

 long. In the other specimen the median lobe of mesothorax alone cop- 

 pery red, the other portions of dorsum of thorax bright golden and 

 emerald-green with coppery reflections ; front green, sides green and 

 blue, metanotum purple and blue ; occiput, legs and abdomen blue, pur- 

 ple and green ; (i mm. long. 

 Hedyclirniii violaceuin. 

 Form vioLACEUM. 



Hedi/chrum violaceum BruUe, Hist. Nat. des Ins. Hym. iv, 51; Norton, 



Trans. Am. Ent. See. vii, 238. 

 Hedi/chrum asperum Brulle, loc. cit. p. 52 ; Norton, loe. cit. 

 Form WiLTii. 



Hedijchrum WUtii Cresson, Proc. Ent. Soc. Phila. iv, 305 ; Norton, loc. 



cit. p. 237. 

 Hedt/chrum Louisiana Norton, loc. cit. 

 Form PARViTM ; new. 

 I have before me seventy-eight examples of this species, among which 

 are Mr. Cresson's type of Wiltii, Mr. Norton's type of Louisianse, and 

 his determinations of violaceum and asperum^ which are undoubtedly 

 correct. The variation in size of the races of this species is most re- 

 markable, and relatively to the named forms is as follows : WilHi, 13.5— 

 10.5 mm. Kansas, Nebraska, Colorado; Louisianse, 10.5—8 mm. Louis- 

 iana, Greorgia, Texas, Colorado, Washington Territory ; Violaceum, 8-7 

 mm. Virginia, Montana, Washington Territory, Mexico ; Asperum, 7—5 

 mm. Canada, Maine, New Hampshire, Pennsylvania, New Jersey, Dela- 

 ware, Virginia, Greorgia, Montana, Dakota, Washington Territory, Col- 

 orado, California, Vancouver's Island, Mexico ; Parvum, 5-1 mm. long, 

 from Montana. 



