1941] 
A New Stizus from Utah 
171 
A NEW STIZUS FROM UTAH, WITH NOTES ON THE 
OTHER NORTH AMERICAN SPECIES 
(HYM.: SPHECID^E) 
By Richard Dow 
Reading, Mass. 
Stizus iridis, sp. nov. 
Male . — Length about 20 mm. Yellow (Amber Yellow 
of Ridgway), with the following exceptions: mandibles 
dark ferruginous at apex with a ferruginous line along the 
interior margin; supra-antennal area with inconspicuous 
dark spots on each side; a broad transverse black band 
across the vertex including the ocelli, with an anterior ex- 
tension along the median frontal groove; occiput with two 
black or ferruginous bands which connect the sides of the 
vertex with an extensive black area surrounding the 
foramen; antennse with the posterior surface of the scape, 
the pedicel, and the flagellum ferruginous, the flagellum 
shading to black above and to orange toward the apex; 
pronotum with a black transverse band anteriorly; disk of 
mesoscutum and anterior margin between posterior lobes 
of pronotum black, either marked with two narrow yellow- 
ish longitudinal stripes (holotype), or two large spots of 
reddish brown (paratype), or simply black (paratype) ; 
dorsal surface of propodeum with a narrow black fascia 
along the anterior margin, wider and with a posterior 
median projection in the paratypes; sutureis of propodeal 
area marked with black lines (partly obsolete in the holo- 
type) which meet on the posterior surface; posterior sur- 
face with a black line extending anteriorly along the median 
groove ; proepisterna black except for a small spot near the 
lateral angle of each front coxa ; mesosternum with a large 
black maculation, medially interrupted in both paratypes, 
and ferruginous in one of them, emarginate (holotype) or 
narrowed anteriorly, but posteriorly with only a narrow 
