lo Myron Harmon Szvenk 



pressed areas at sides of mesoscutellum and metanotum, broad median 

 band across propodeum, upper metapleural plate, anterior and superior 

 mesopleural sutures narrowly, a small depressed dot on upper mesopleura, 

 spots on last four coxae behind and on middle tibiae at base and most of 

 posterior face of hind femora and tibiae, black. Extreme lower corners 

 of face and spots at sides of elevated portion of metanotum sometimes 

 yellowish. Antennae red, the ends of the joints faintly dusky above, joint 

 3 two-thirds as long as 4, about equal to 5. Tubercles red. Tegulae red, 

 punctured. Wings hyaline, a band across the end dusky, costal nervure 

 and stigma yellowish, other nervures yellowish brown to fuscous, basal 

 nervure intersitial with or basad of transverso-medial, second submargina^ 

 cell much narrowed above. Mesoscutellum rather strongly bilobed. Hind 

 basitarsi infuscated externally. Tergum strongly banded with yellowish 

 white, the band on tergite i narrow, medially interrupted and dividing the 

 basal black half from the apical mostly reddish half, those on 2-5 broad 

 and complete, the basal and apical margins of 2 and 3 more or less black 

 or red, the apical margins of 4 and 5 broadly red. Venter red, sternites 3 

 and 4 and sometimes 5 with more or less yellowish white spotting or band- 

 ing. Outer face of hind tibiae tuberculate. Pubescence very sparse and 

 short, almost absent over most of the body, brownish or fuscous on vertex 

 and thorax above, pale yellowish on inner sides of basitarsi, elsewhere 

 whitish. Tergite 5 with a narrow apical whitish hair fringe, its sides, with 

 sides of 4 and 6, with a few dark bristles. Head and thorax strongly and 

 densely punctured, abdomen minutely, closely punctured. 



c?. Length 7.5-9.5 mm. In general resembles the ?. Mandibles except 

 tips, labrum, line under and sometimes behind eyes, clypeus or most of it. 

 lateral face marks extending about to level of antennae, scape in front, 

 tubercles, tegulae, two spots on mesopleura, spots on sides of elevated por- 

 tion of metanotum, usually four small spots on propodeum, spots on coxae 

 in front and spots on knees and ends of tibiae behind, yellowish white. 

 Yellow of face merging into red along orbits, lower sides of face and 

 supraclypeus, elsewhere black. Three broad black bands on mesoscutum, 

 these sometimes entirely crowding out the red color, other black markings 

 of thorax and legs as in the $ except that sometimes the propodeum be- 

 comes mostly black. Antennae red below, much blackened above espe- 

 cially basally, joint 3 one-half as long as 4, distinctly shorter than 5. Yel- 

 lowish white band on tergite i undulate on anterior margin and usually 

 complete, those on 1-3 with small enclosed red spots or emarginations on 

 the sides posteriorly, and more or less incised on anterior margin medially, 

 4-6 yellowish white except for the narrow reddish apical margins, 6 red 

 with a pale spot, apically notched. Venter mostly yellowish white, the 

 apical margins of the sternites testaceous to blackish. 



Type. — Medora, North Dakota, August 30, 1914, on Solidago 



rigida (O. A. Stevens, No. 8465), 5- 



164 



