254 ENTOMOLOGICAL NEWS. [June, '08 



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 

 striae, also some punctures ; furrow abruptly ending below middle of 

 posterior face; posterior face with three more or less distinct trans- 

 verse strise, rest apparently finely punctured; sides of metathorax 

 finely, closely, transversely striated ; all femora without teeth ; middle 

 tibiae without apical spur; middle and posterior tibiae 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 scutellum, 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 tibia; beneath, spot on posterior tibiae beneath, anterior 

 tarsi, greenish-yellow; tegulaa rufous ; wings dusky hyaline ; nervures 

 and stigma dark brown ; clypeus with silvery pubescence ; meso-pleuroe 

 with white hair. 



Var. with the sculpture of dorsulum weaker, meso-pleuras 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 

 (=ttia-culatits) 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. 



