NORTH AMERICAN HYMENOPTERA. 215 



not sparse punctures; scntellum and metanotum maculated with yellow; 

 segments 2-5, sometimes the first with a large yellow spot on each side, 

 those on the fifth connected ; all the tarsi yellowish testaceous. 



inccrtiis. 



44. — Space between the eyes beneath at the base of clypeus about equal to the 

 length of the pedicellum and first joint of flagelluni united, at any rate 

 not less; mesopleurije, in addition to the punctuation, with a delicate 

 striation, sometimes .scarcely evident (hind tarsi blackish). 



tenuiglossus. 



Space between the eyes beneath at the base of clypeus somewhat less than 



the length of the pedicellum and first joint of flagellum united ; me.so- 



pleurse not .striated (hind tarsi yellowish testaceous) tiiinidiis. 



45. — -Sculpture of head and thorax subtile, rather indistinct, apparently with 

 shallow punctures (middle segment above with longitudinal ridges, less 

 distinct than usual ; markings whitish ; clypeus and scape, except apex, 

 black ; head and thorax clothed with thin, pale, long pubescence). 



vernaliisi. 



Sculpture of head and thorax, particularly that of the dorsuluni, well 



marked 46. 



46. — Middle segment above very coarsely .sculptui'ed ; with strong, longitudinal 



or somewhat oblique ridges, which extend to base of posterior face. • -47. 



Middle segment above not so coarsely scul])tured ; if it is, then the ridges 



become obsolete toward the posterior face (in one case with close, rather 



fine longitudinal strife) 50 



47. — Scape entirely black except a narrow ring at apex (space between hind ocelli 



slightly less than that between them and nearest eye-margin ; spot on 



scutellum ; spots on first abdominal segment separated . Provaiiclieri. 



Scape yellow, at least anteriorly 48. 



48. — Dorsulnm rather finely punctured ; middle segment above with the furrow 

 broad, shallow, and usually with a short longitudinal ridge anteriorly in 

 the middle; pronotnni not distinctly dentate, laterally yellow (markings 

 yellowish white ; scape black posteriorly ; hind tibige whitish at base 



only ; size small) tenuis. 



Dorsuluni strongly punctured ; middle segment above with the furrow deep ; 

 pronotum distinctly dentate laterally 49. 



49. — Space between hind ocelli about equal to or a little greater than that be 

 tweeu them and the nearest eye-margin (first abdominal segment with 

 two separate spots, the marks on second segment pointed internally; tips 



of femora not yellow) a<lveiius. 



Space between hind ocelli less than that between them and the nearest eye- 

 margin (first abdominal segment with a broad transverse band, the marks 

 on the second segment truncate within ; tips of all the femora more or 

 less yellow) conspiciius. 



50. — Middle segment above with a somewhat triangular depression; fovete of the 

 episternal suture of mesopleuriB less strongly marked than usual ; mark- 

 ings white (doi-sulum rather sparsely punctured ; space between hind 

 ocelli about equal to that between them and the nearest eye-margin ; 

 scutellum and metanotum whitish ; first abdominal segment with a baud, 

 spots on segments 2 and 3 almost touching within, those on segments 4 

 and 5 uniting within as usual ; ventral segments 2-4 with whitish macn- 

 lations) pallidum. 



TRANS. AM. ENT. SOC. XXII. JUNE, 1895. 



