184 U. S. NATIONAL MUSEUM BULLETIN 2 1 6 part 3 



35. Hind basitarsus white, its base infuscate; female flagellum with a broad 



white baud; front tibia of female inflated, rather abruptly constricted near 



its base. Male unknown 27. crassulus (Pratt) 



Hind basitarsus entirely black; female flagellum without a white band; front 

 tibia of female not inflated, gradually narrowed to its base 36 



36. Ovipositor sheath 0.78 as long as front wing .... 25. atritibialis (Pratt) 

 Ovipositor sheath about 0.47 as long as front wing. 



26. mentigus, new species 



37. Punctures on lateral lobe of mesoscutum moderately sparse, separated by 



about 1.0 their diameter; thorax of female fulvous; face of male entirely 

 whitish, or sometimes with an incomplete, narrow, sublateral fuscous 

 stripe; propodeum of male usually more or less fulvous; flagellum with only 

 about 27 segments; hind tarsus of male not marked with white. 



29. minimus (Pratt) 



Punctures on mesoscutum usually moderately dense, usually separated bj' 



less than their diameter; thorax of female black or mostly so; face of male 



marked with black except in T. ruralis; propodeum of male entirely black; 



flagellum usually with more than 29 segments 38 



38. Frons with coarse transverse wrinkles; tergites 2-4 weakly mat, subpolished; 



hind femur ferruginous; hind coxa black; hind basitarsus of male brown 



with its apical 0.4 ± pale yellow 35. rugifrons, new species 



Frons with fine or moderately fine transverse wrinkles or its wrinkling weak 

 and irregular; tergites 2-4 moderately to rather strongly mat; hind femur 

 and coxa each either black or ferruginous but if hind femur is ferruginous 

 then hind basitarsus of male is entirely fuscous 39 



39. Hind femur ferruginous and the upper margin of pronotum entirely pale 



yellow; sculpture of head and thorax dense, the central part of mesopleu- 

 rum of both sexes rugulose, without punctures. 



30. scapulatus, new species 

 Hind femur ferruginous or black; upper margin of pronotum usually black or 

 mostly black, if entirely white or yellow then the hind femur black; sculp- 

 ture of head and thorax less dense, the central part of mesopleuruni punc- 

 tate, ruguloso-punctate, or rugulose, in the male always with at least a few 

 punctures 40 



40. Speculum coarsely rugoso-punctate; temple about 0.73 as long as eye, at its 



midheight almost flat; hind femur black; second recurrent vein very weakly 



sinuate 32. latigenalis (Pratt) 



Speculum with small to medium-sized, distinctly separated punctures; temple 

 about 0.60 as long as eye, at its midheight moderately convex .... 41 



41. Males (Males of areolatus and krombeini, which should key to this couplet, 



are unknown. Males of krombeini should have the hind femur black; in 



areolatus it should be ferruginous.) 42 



Females 44 



42. Median segments of hind tarsus nearly always partly or entirely white; hind 



femur black or ferruginous; hind coxa black or ferruginous; apical carina of 

 propodeum rather close to basal carina .... 34. albitarsis (Cresson) 

 Median segments of hind tarsus brown or fuscous, paler at the joints; hind 

 femur ferruginous; hind coxa black; apical carina of propodeum a mod- 

 erate distance from basal carina 43 



43. Face entirely white; upper margin of pronotum and under side of middle 



coxa usually marked with white 24. ruralis (Pratt) 



Face with a sublateral black stripe; upper margin of pronotum and under 

 side of middle coxa black 28. persimilis (Cresson) 



