56 PEOCEEDIKGS OF THE NATIONAL MUSEUM vol.78 



42. Orbits black 43. 



At least frontal orbits white 45, 



43. Metapleurum sparsely punctate convergens Cushman, female (Peru). 



Metapleurum weakly rugose 44 



44. Apophyses slender ; first recurrent and nervulus interstitial. 



marginatus Szepligeti, female (Bolivia). 

 Apophyses short and stout; first recurrent autefurcal; nervulus postfurcal. 



prominens Cushman, female (Bolivia). 

 (These are only characters in description of marginatus, with 

 which prominens does not agree.) 



45. Posterior orbits mostly and face entirely white. 



gibbulus Szepligeti, female (Bolivia). 

 Posterior orbits entirely and face medially black. 



isthmus Cushman, female (Panama). 

 (The species described by Spinola as capitator [Fabricius] will ap- 

 parently run here, but differs from isthmus by having the propodeum 

 posteriorly strongly punctate.) 



46. Scape white below leucostomus Taschenberg, male (Brazil). 



Scape black or reddish below 47. 



47. Abdomen red, with third and following tergites black at base. 



atriceps Cresson, female (Mexico). 

 Abdomen black, or black and white, with at most petiole red 48. 



48. Propodeum strongly impx*essed in basal half 49. 



Propodeum at most shallowly impressed before basal carina 51. 



(curviventris Cameron, female [Panama]. Runs to 48 but pro- 

 podeal character not mentioned in description.) 



49. Clypeus black nigriclypeatus Cushman, female (Panama). 



Clypeus yellow 50. 



50. Tergites broadly white at apex nudus Szepligeti, female (Bolivia). 



Tergites at most narrowly margined with reddish. 



impressus Cushman, female (Bolivia). 



51. Hind femur x'ed 52. 



Hind femur black 54. 



52. Tergites distinctly white-margined apically. 



paranensis Cushman, female (Brazil). 

 Tergites not distinctly white-margined apically, but broadly so laterally — 53. 



53. Frontal horn black capitator (Fabricius), female, male (South America). 



nigriventris Cameron, female (British Guiana). 

 (Brull^'s description of capitator and that of nigriventris read 

 like two descriptions of the same species.) 

 Frontal horn white albiniclavus Cushman, female (French Guiana). 



54. Clypeus black or more or less piceous. 



parviclavus Cushman, female (Peru). 

 Clypeus distinctly white 55. 



55. Tergites beyond second not margined with white ; hypostomal carinae very 



high and meeting along median line inca Cushman, female (Peru). 



Tergites distinctly white-margined ; hypostomal carinae not so high 56. 



56. Frons with a minute tubercle above base of horn ; clypeal suture straight. 



femoratus Spinola, female (Guiana). 

 Frons with two f ossulae above base of horn ; clypeal suture strongly arched. 



brevigenalis Cushman, female (Panama). 



57. Thorax red and black, or piceous, often white-marked 58. 



Thorax white or yellowish and black 79. 



J 



