T. D. A. COCKERELL. 197 



30. Head and thorax (jiiite thickly pubescent, all the tarsi })ale yellow. Illinois 



species illiiioeii!>ii!>> Cr. 



Head and thorax sparsely pubescent 31. 



31. Lateral face-marks very narrowabove- . Paimrgimi!* bideiitiw (Ckll.). 

 Lateral face-marks not very narrow above. 



PaiiiirgiiliiM rudberlcise (Rob.), if there is a var. without 

 supraclypeal mark. 



Lateral face-mark cmly "aspot" Faiiiirginus asteris (Rob.). 



Obs. P. rudbecMse also diflfers from asteris by the median impunctate depres- 

 sion of clypeus. Perhaps a form of coloradensis comes here ; it will 

 have tibiae and tarsi bright yellow. 



32. Supraclypeal marks, but no dog-ear marks 33. 



Dog-ear marks present, or face even all yellow 39. 



33. Tibise and tarsi all yellow <-iti|>eN Ashm 



Tibise, at least, mostly dark 34. 



34. Four hind tibise yellow at base and apex 35. 



Four hind tibise not yellow at base and apex 36. 



35. Lateral face-marks prolonged above level of supraclypeal mark. 



coiiciniius Fox. 



Lateral face-mark '• a spot " P. asteris (Rob.). 



(In rudbeclclx the lateral face-marks are longer than in asteris, and there 

 is an impunctate area on clypeus; the flagellum is pale testaceous 

 beneath in concinnas, dark in rudbeckise). 



36. Clypeus, etc., white, antennae wholly black atrieornis Cr. 



Clypeus, etc., yellow 37. 



37. Clypeus with a median impunctate space P. riKlbeckiae (Rob.). 



Clypeus without such space Paniirgiiius labrosiis (Rob.). 



38. Wings dark fuliginous, face lemon-yellow, not quite up to antennae. 



sethiops Cr. 

 Wings not dark fuliginous 40. 



39. Scape wholly black 41. 



Scape yellow in front 42. 



40. Less densely punctured, marginal cell longer. 



Paiiiirginus (ornatipes var,'?) boylei (Ckll.). 

 More densely punctured, marginal cell shorter. 



Paiiruginus coinposilariini (Rob.i. 



41. First four tibiae yellow in front 42a. 



Tibia} yellow with a black spot on each side. 



Paiiurgiiius ornatipes (Cr.). 



41a. All the tibiae yellow in front C. rhodophjliis Ckll. 



First four tibiae yellow in front C. flavifrons Sm. 



42. Abdomen with light color bands 44. 



Abdomen without such bands 45. 



43. Abdominal bands white, anal fimbria dii'ty white meliloti Ckll., 9 • 



Abdominal bands yellow, anal fimbria fuscous ciiictiis Cr., 9 • 



Abdominal bands and anal fimbria white, .sci<»/»s-like species, much larger 



than meliloti personalus Ckll., 9- 



44. Males 46. 



Females 47. 



TEANS. AM. ENT. SOC. XXV. DECEMBEE, 1898. 



