254 ENTOMOLOGICAL NEWS. [June, ’o8 
nearest eye margin; facial basin distinctly margined above, smooth, 
shining; first joint of flagellum a little longer than second, first and 
fourth emarginate basally, second and third slightly produced in middle 
beneath; clypeus rounded anteriorly, slightly produced in middle, 
without lateral teeth; middle carina well developed; pronotum pro- 
duced anteriorly, notched in middle, a strong sharp spine laterally, 
a faint transverse carina near apical margin; dorsulum rather coarsely 
striato-punctate, striae more distinct posteriorly, two distinct longi- 
tudinal carina; scutellum striato-punctate or striated; meso-pleura trans- 
versely striated above, punctured below, meso-pectus shining, finely 
punctured; suture between episternum and epimeron meso-pleuralis 
strong; upper surface of metathorax divided by a margined furrow, 
the walls of which separate the upper and posterior faces by turning 
at right angles with the furrow; upper surface with a few oblique 
striz, also some punctures; furrow abruptly ending below middle of 
posterior face; posterior face with three more or less distinct trans- 
verse striz, rest apparently finely punctured; sides of metathorax 
finely, closely, transversely striated; all femora without teeth; middle 
tibiz without apical spur; middle and posterior tibie with a few teeth 
on outer margin; abdomen shining, very finely punctured, venter with- 
out punctures; apical segment sharp at apex, with a fringe of hairs. 
Color black; spot on apex of scape in front, two elongate spots on 
pronotum, two small spots before scutelium, postscutellum, rather large 
spot on dorsal segments 1-4, band on dorsal segments five and six, 
greenish-yellow; legs black, line on posterior side of anterior femora 
and a spot on apical anterior side, spot on apex of middle femora, 
anterior four tibize beneath, spot on posterior tibie beneath, anterior 
tarsi, greenish-yellow; tegule rufous; wings dusky hyaline; nervures 
and stigma dark brown; clypeus with silvery pubescence; meso-pleure 
with white hair. 
Var. with the sculpture of dorsulum weaker, meso-pleure more 
striato-punctate, ridges of metathorax not so prominent, tubercles 
yellow. 
Habitat—Florissant, Colo., July 7, 1907 (S. A. Rohwer), 
fls. Heracleum lanatum. Var. Florissant, Colo., June 26, 1907 
(S. A. Rohwer), on foliage of Salix brachycarpa. 
This species may be separated from all others of the sub- 
genus Xestocrabro by the strongly spined pronotum. In the 
somewhat striated effect of the dorsulum it resembles singularis 
(—=maculatus) but there is no spine on the anterior femora. 
Closest to foxii Kinc., but the structure of the metathorax is 
different and the scape is partly yellowish, etc. 
