AMERICAN HYMENOPTERA. 243 



35. Insects with whitish or yellowish face marks 30. 



Insects without such face marks 64. 



36. Females 37. 



Males 40. 



37. Spot of lemon yellow on each side of face 38. 



38. Clypeus dark, apical margins of abdominal segments pale testaceous 



pulchella Rob. 

 Clypeus in part or wholly yellow 39. 



39. Clypeus pale lemon yellow with sides black ; with semicircular spot on sides 



of face below the eyes 1 1 iciarimi Ckll. 



Clypeus entirely yellow, apical margins of abdominal segments provided 



with narrow fasciae of white pubescence Alicise Rob. 



Sometimes with a yellow spot on clypeus, in the median line not far from the 



anterior edge Kincaidii Ckll. 



40. With both the clypeus and a spot on each side of face white or yellowish- .41. 

 With clypeus alone light colored 52. 



41. abdomen impunctate, the surface finely tesselate 42. 



Abdomen distinctly punctured 44. 



42. Very small, not over 6 mm. long, the face marks whitish. 



personata Rob. 

 Larger, between 7 and 9 mm., face marks yellow or yellowish 43. 



43. Thorax with sparse, feeble punctures, its pubescence dirty white. 



asteris Rob. 

 Thorax minutely tesselate, with strong quite numerous punctures, its pubes- 

 cence pale ferruginous C'ragini Ckll. 



44. Clypeus wholly light colored, except anterior edge and the usual two dots; 



vernal species 46. 



Clypeus with more or less black ; autumnal species 45. 



Clypeus sometimes with a small yellow spot, also one such spot on each side 



of face violae Rob. 



45. Sides of clypeus black, wings dusky at apex, first two abdominal segments 



with orange-fulvous bands Aliciarum Ckll. 



Anterior margin of clypeus broadly black, wings clear. . • -pulchella Rob. 



46. Face markings lemon yellow 47. 



Face markings cream color 50. 



47. Joint 3 of antennae shorter than 13, about at long as 5, entire apical margin 



of clypeus black, lateral face marks small or wanting. . .dubia Rob. 

 Joint 3 of antennae as long as 13, and as long as 4 and 5 together 48. 



48. Pubescence orange fulvous. Sometimes with a supraclypeal light patch. 



Antennae dark. Wings a little dusky at tips kausensis Ckll. 



Pubescence dull white 49. 



49. Middle of anterior margin of clypeus black, lateral face marks large. 



Cressoni Rob. 

 Entire apical margin of clypeus black, lateral face marks small or wanting. 



Bridwellii Ckll. 



50. Length 12 mm., flies in June rudbeckia* Rub. 



Length not ever 8 mm., fly in March and April 51. 



51. Larger, flagellum dark Capricorn is Casad. & Ckll. 



Smaller (6 mm.), flagellum ferruginous pri miili Iron*. Casad. 



TRANS. AM. ENT. SOC., XXIX. AUGUST. 1903. 



