370 CHARLES ROBERTSON. 



2. Fasciae on segments 2-3 narrow, arcuate; pubescence fulvous or ochraceous; 



wings a little yellowish ; tarsi black ; 14-16 mm. • • • obliqua. 



Fasciae on segments 2-3 broad, reaching apical margin ; pubescence pale 

 ochraceous; tibiae at apex and tarsi inclining to testaceous; apical 

 margin of segment 1 rather broadly pale testaceous; 11 mm. 



illinoensis. 



3. Length 8-11 mm. ; joint 3 at shortest point not longer than 2; abdomen with 



fasciae continuous, distinct ; wings hyaline 10. 



Length 11-16 mm.; middle-sized or large species with joint 3 at shortest 

 point longer than 2, or with the fascise usually interrupted, indistinct 

 or wanting 4. 



4. Base of mandibles and labrum usually colored 6. 



Base of mandibles black; labrum black, rarely with a small spot; abdomen 



at least above with pubescence almost entirely black, except on bases 

 of segments 1-2 ; tegulae black 5. 



5. Pubescence of legs black, short ; elsewhere black, except on face, cheeks 



beneath, vertex, thorax above, pleura and bases of segments 1-2, where 

 it is cinereous or pale ochraceous; black, except clypeus. joints 4-13 

 beneath, bases of claws, sometimes the spurs and apical joints of tarsi ; 

 joint 3 twice as long as 2, 4 not much longer than 5 ; 12-13 mm. 



cnici. 

 Pubescence long and fulvous, except on abdomen, where it is almost entirely 

 black; spurs and apical joints of tarsi testaceous; joint 3 not longer 

 than 2,4 much longer than 5; labrum rarely with a yellow spot; 

 narrow, oblique, dull fulvous or whitish fasciae on sides of segment 2, 

 sometimes also on 3, rarely continuous, rarely wanting; 11-14 mm. 



aiitiiuiiiali*. 



6. Pubescence usually black, except on face, tibiae, tarsi and sides of segments 



3-5; wings clouded; tegulae black; mandibles sometimes entirely 

 black ; labrum yellow ; joint 3 about twice as long as 2 ; 11-13 mm. 



bimacalata. 



Pubescence not black, except sometimes on vertex, mesonotum, scutel and 



abdomen 7. 



7. Segment 2 distinctly punctured, a short apical fascia on each extreme side; 



continuous fasciae on segments 4-6; pubescence fulvous, patches on 

 mesonotum and scutel usually black ; wings more or less fuliginous; 

 tegulae black; clypeus, labrum and base of mandibles yellow ; joint 3 



little longer than 2 ; 14-16 mm. coloradensis. 



Segment 2 obscurely punctured, with basal and median whitish fasciae, con- 

 tinuous fasciae on 3-4 8. 



8. Wings hyaline, nervures rather pale; pubescence and ornaments whitish; 



scutel sometimes with black hairs; labrum with a whitish stripe or 

 sometimes entirely black ; tegulae black ; broad apical margins of seg- 

 ments 1-5 pale testaceous: 5 with strong lateral spines; 12-14 mm. 



vernoniase. 



Wings and nervures yellowish, more fuscous beyond middle; pubescence 



ochraceous; ornaments yellow 9. 



9. Segments 5-7 black; mesonotum, scutel and vertex without black pubes- 



cence; tegulae testaceous; joint 3 little longer than 2 ; 12-14 mm. 



comptoides. 



