1 6 Myron Harmon Szvenk 



silvery sericeous pubescence, the enclosure abruptly black and 

 glabrous; insect dark red, the depressed and concealed portions 



black ; 8-9.5 "im adducta 



Joint 3 of antennae not longer than 4, usually distinctly shorter; sides of 

 propodeum without peculiar appressed sericeous pubescence..! 



I. Joint 3 of antennae conspicuously shorter than 4, distinctly less 

 than one-half its length; lower anterior orbits usually narrowly 

 yellow or yellowish ; abdomen usually with small yellow spots 

 on sides of tergites 2 and 3, these sometimes wanting; insect 

 red, depressed and concealed portions black ; 6-7 mm. 



iaraxacella 



I. Joint 3 of antennae over one-half as long as 4 2 



2. Apical margins of abdominal tergites 1-4 with narrow but very distinct 

 black bands contrasting with the otherwise chiefly red abdo- 

 men ; head and thorax uniform light red, merely with a little 

 black in the thoracic sutures; joint 3 of antennae slightly but 

 distinctly more than one-half as long as 4; 8 mm. 



nigro fas data 

 2. Apical margins of abdominal tergites without distinct contrasting nar- 

 row black bands, but sometimes with more or less suffused 

 blackish ones {e. g., velutina) 3 



3. Abdomen red without yellow spots even on sides of tergite 2 ; 

 joint 3 of antennae nearly as long as 4 4 



3. Abdomen with yellow spots on the sides of some of the tergites, 

 at least on sides of 2, these spots rarely suffused {e. g., angu- 



lata) ; joint 3 of antennae often decidedly shorter than 4 7 



4. Mesoscutellum crested,, deeply bilobed ; vertex and mesonotum coarsely 

 punctured; sides of propodeum with long dense erect silvery 



hair; 7 mm .' bilobata 



4. Mesoscutellum low, flattish, not distinctly bilobed; vertex and mesono- 

 tum more finely punctured; sides of the propodeum with the 

 hair thin, or if rather dense of an ochreous color (e. g., 

 ochrohirta) 5 



5. Clypeus smooth, very finely and rather feebly punctured ; apex of 

 hind tibiae with a pair of large stout curved black bristles; 

 mesoscutum red without a complete median black line ; face 

 without a distinct black spot ; propodeum red with a blackish 

 spot at apex of enclosure; scape without black hairs; 7 mm. 



bisetosa 



5- Clypeus closely and strongly punctured; apex of hind tibiae with 

 a row of short straight black bristles or setae ; mesoscutum with 

 a broad median black line; face with a large oval black spot 

 about antennal bases which encroaches downward in the cly- 



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