20 G. C. DAVIS. 



This is one of the most coinnion and wide-spread species in America 

 and Europe. 



Bassus orbitalis Cr.. Proc. Ent. Soc. Phila. iv, 272, 9 • 

 B. dndulns Cr., Proc. Acad. Xat. Sci. Phila. 187S, 375, % 9 . 

 B. orUtalis Ashm., Proc. U. S. Nat. Mus. xii, 439, 9 . 



9 . — Length 5-7 iiini. Black ; broad orbital liues, sometimes spot on face, 

 mouth, teg'ilffi, spot in front, line l>eneath wings, line on margin of mesonotum 

 often recurving into two parallel lines in the centre, scutellum, post-scutellum, 

 broad central baud on hind tibia? and more or less of abdomen at tiii of segments, 

 yellowish white. Base and tip of posterior tibiae and hind tarsi black ; four an- 

 terior coxiE and trochanters variable ; metathorax coarsely punctured, rugose ; 

 first segment of the abdomen with two parallel carinse. 



'^ . — Has the face and scape beneath white and usually most of the abdomiual 

 segments margined with yellowish white, which varies to ferruginous. It is the 

 cincfuhts of C'ressou. 



Fifteen female and twenty-three male specimens from Colorado, 

 Nevada, California, Montana, Oregon, New York, New Ham])shire 

 and Ottawa, Canada. 



Bassus scutellaris t'r., Trans. Anier. Ent. Soc. ii, 112. 



9 . — Length 4-6.5 mm. Black ; pleura, sternum, and most of legs, honey- 

 yellow ; orbits, spot on front, mouth, tegulie, spot in front below and above, scu- 

 tellum, post-scutellum, anuulus on posterior tibise, and more or less of the margins 

 of the abdomen, white ; remainder of posterior tibiaj and tarsi black ; metathorax 

 aud first three segments of abdomen, from base to transverse groove, rugose ; 

 deeply punctured. 



■J, . — Ditfers ouly in having face, scape beneath, and four anterior coxie and 

 trochanters white. 



Five female and two male specimens from Illinois, JMichigan, 

 Ottawa (Canadaj, Georgia, Virginia and Mt. Hood, Oregon. 



Bassus conciniius Cr., Trans. Amer. Ent. Soc. ii. 111. 



o . — Length 5.5 mm. Black, legs honey-yellow, except the trochanters and 

 anterior coxse, which are yellowish white ; posterior tibiae, which are white, black 

 at tips, and posterior tarsi which are black. The following parts are marked with 

 yellowish white : anterior orbits, mouth, tegulge, spot in front, above and below, 

 scutellum aud post-scutellum; metathorax and base of abdomen coarsely and 

 deeply punctured as in scutdlaris ; first segment with two distinct carina;. 



% . — Same, except entii'e face, underside of antennae and four anterior legs, 

 white : the terminal portions of the abdominal segments are slightly rufous. 



Two female specimens from Connecticut, and one male from Mass. 



Busi^U!^ pulcUripes Prov., Faune Ent. Can. ii, 428. 



9 . — Length 5-7.5 mm. Black, with pleura, scutellum usually, and a jiatch in 

 front of it, rufous. Legs variable from rufous to almost white ; posterior tarsi, 

 except basal segment, which is white, and tip of posterior tibia; black ; mouth, 

 short orbital lines in front, teguht, spot in front, line below, broad line on margin 



