1896.] NATURAL SCIENCES OF PHILADELPHIA. 49 



42. Abdomeu not heavily marked 13 pallidior. 



Abdomen piceous with ill-defined yelloAvish bands .... 



10 ohscurata. 



43. The pale color confined to clypeus and sides of face ... 44 

 The pale color not confined to clypeus and sides of face . . 72 



44. Abdomen dark, not banded, or the bands discontinuous . 45 

 Abdomen with continuous bands 63 



45. Larger species, length over 6 mm 46 



Smaller species, 6 mm. or less 51 



46. Mesothorax practically nude 47 



Mesothorax hairy 49 



47. Abdomen dark brown without pale marks . . .56 nuda 9 

 Abdomen with pale marks, clypeus pale with two black bars, 48 



48. Abdominal markings yellow 11 odomaculata 9 



Abdominal markings creamy white .... 58 seneeionis. 9 



49. Female ; abdomen more or less spotted . . 68 verhesime. 

 Males 50 



50. Head and thorax brassy-green 70 lej)achidU. 



Head and thorax rather bluish-green . . . ()9 albipennis. 



51. Abdomen without distinct light markings 51a 



Abdomen with yellow or white markings . 58 



51a Pale face-marks reduced to a spot on clypeus; nervures 



brown 52 phymatce var. 9 



Pale face-marks not so reduced, lateral marks present . . 52 



52. Nervures brown, Californian species 53 



Nervures pallid 54 



53. Lateral face-marks with their upper angle a right angle. 



3 californica $ var.- 

 Lateral face-marks with their upper angle a very acute 

 angle 31 trisignata 9 



54. Clypeus with two large dark patches on hind margin, up- 



per angle of lateral face-marks a very acute angle, meso- 

 thorax very hairy 57 asteris 9 



Clypeus pale except the usual dots 55 



55. Anterior tibiae black in front ; face extremely hairy . . . 



65 albovittata S 



Anterior tibiie yellow or rufotestaceous in front 56 



■56. Marginal cell with the substigmatal portion very much 



longer than the poststigmatal, size very small 



17 larrearum 9 

 Marginal cell ordinary 57 



