368 CHARLES ROBERTSON. 



4. Fascia on segment 2 narrow, median, continuous ; 3 with a basal fascia ; fascia 



on 4 with a patch of black pubescence on the disc ; vertex more or less 

 black in front; disc of mesonotum nearly bare, sparsely punctured ; 

 hind metatarsi fulvous posteriorly ; middle of mandibles rufous; tegulse 

 piceous, sometimes testaceous; lp. 16:8; 11-13 mm.; sjhnov.; 50 speci- 

 mens variabilis. 



Fascia on segment 2 obsolete, or nearly, oblique ; vertex with black hairs. .5. 



5. Pleura largely black ; segment 2 im punctate; oblique lateral fascia on 3; and 



usually on 2 ; black patch on mesonotum separated from tegulaj ; tegu- 

 lse testaceous; lp. 18:8; 15-17 mm. obliqua. 



Pleura ochraceous; segment 2 distinctly punctured ; 3 with subapical, some- 

 times interrupted, fascia ; fascia on 4 notched with black posteriorly; 

 black patch on mesonotum reaching tegulse ; tegulse black; lp. 16:8; 

 14-17 mm. coloradensis. 



6. Black patch on mesonotum reaching tegulse, or nearly ; vertex strongly black 



ciliate; fascia on segment 4 usually with a patch of black hairapically, 

 at least on the disc; front and middle legs with pubescence more 



blackish • • • -9. 



Black patch on mesonotum distinctly separated from tegulse; vertex at most 

 with some black hairs in front; fascia on segment 4 entire; front and 

 middle legs with pubescence pale 7. 



7. Wings whitish, nervines pale; patch on mesonotum and scutel rather small 



and fuscous; lp. 11: 6; 11-13 mm. iiivea. 



Wings less whitish, nervures darker; patch on mesonotum and scutel more 

 black 8. 



8. Tibial scopa pale ochraceous posteriorly; segment 1 with narrower whitish 



margin; lp. 14:7; 12-14 mm veriioniie. 



Tibial scopa more fulvous posteriorly; segment 1 with broader whitish mar- 

 gin ; lp. 12 : 6 ; 12-13 mm. sp.jipv.; 3 specimens coreopsis. 



9. Pubescence ochraceous, blackish on clypeus, labrum, vertex, mesonotum 



between tegulse, scutel, usually the thorax and abdomen beneath ; 

 scopa, except metatarsi posteriorly, ochraceous; segments 2-4 with pale 

 fascise; bordered with black on 4; sometimes entirely black, except 

 the scopa and some pale hairs on face, cheeks, collar, pleura, meta- 

 thorax, legs and base of abdomen ; lp. 9:5; 11-12 mm. si mil lima. 



Pubescence cinereous; fascia on segment 4 rarely with a black apical border; 



lp. 12:6; 10-12 mm. 10. 



10. Scopa whitish ; hind metatarsi blacker posteriorly; pubescence of mesonotum 

 short, thin, black, whitish on anterior median portion ; segment 2 

 nearly impunctate, at least on the disc, broad apical margin bare; fas- 

 cia on 2 thin, whitish, oblique, widely interrupted ; fascia on 4 com- 

 monly with a bare notch posteriorly ; scutel more convex and opaque ; 

 antennae, tegula, tarsi and nervures darker; sp. nojv. ; 57 specimens 



veriioiiiana. 



Scopa more ochraceous; hind metatarsi less black posteriorly ; pubescence of 

 mesonotum longer, more dense, pale in front of an arcuate line between 

 tegulse; segment 2 distinctly punctured between the fascise, the disc 

 pubescent, apical margin narrower and usually with appressed black 

 hairs, fascia less oblique, less white, usually continuous; scutel more 

 flat and shining; antennae, tegulse, tarsi and nervures more reddish; 

 SQjnov. ; 60 specimens boll oil i.e. 



