1909] ROHWER— NEW CHRYSIDID WASPS 87 
SOME NEW CHRYSIDID WASPS FROM WESTERN UNITED STATES. 
BY S. A. ROHWER, BOULDER, COLO. 
Hedychridium polygoni n. sp. 
Female: length 6.5 mm. Head about the same width and length as the pro- 
thorax, rather transverse; closely punctured and appearing granular. Anterior 
margin of the clypeus straight; the middle raised into a low rounded carina. ‘The 
basal part of the mandibles punctured; malar space very narrow; cheeks narrow; 
orbital carina wanting;' eyes converging below; eyes oval. Facial basin strongly 
transversely striated; in the middle there is a shallow longitudinal furrow. ‘Third 
antennal joint distinctly longer than the fourth. Pronotum, mesonotum and scutel- 
lum punetured as the head; parapsidial furrows only faintly indicated, straight and 
parallel. ‘Tegulee black, polished, impunctate. Postscutellum with large punctures, 
or more properly strongly reticulate; from the postscutellum there is a distinct 
carina running to the base of the abdomen; fovea of the metanotum irregularly 
striated; teeth of the metathorax sharp. Claws with a rather large inner tooth. 
Basal middle of the first abdominal segment with a narrow impression in addition 
to the usual broad depression; the middle of the first abdominal segment and the 
basal three-fourths of the second finely and rather sparsely punctured; sides of the 
first, and to some extent the sides of the second, the apical third of the second and all 
the third with larger, closer and somewhat confluent punctures. Posterior margin 
of the third segment evenly rounded, not notched. Color very dark blue, almost 
purple, without any green reflections; antenne beyond the scape, legs beyond the 
tibie and the tegule black or brownish. ‘The entire insect covered rather sparsely 
with short black hair; tarsi with gray pubescence. Wings dusky, the apical third 
darker; venation brown or black. 
Type locality: Boulder, Colo., Sept. 1, 1908, at flowers of Polygonum (S. A. 
Rohwer). 
The ridge connecting the postscutellum and the metanotum, and the striated 
fovea, will make this species fall next to H.c@ruleum Norton (Dak. and Mont.). It 
differs from Norton’s description of ceruleum as follows: facial basin striated, tegule 
black, and the color is entirely dark blue. In the same locality and on the same day 
1The term “orbital carina” is used to denote the carina on the cheeks from the mandibles toward 
the top of the eye on the posterior margin of the head, 
