70 I^ROCEEDINGS OF THE NAT10i\AL MUHEUM. vol. 49. 



17. General color reddish yellow; recurrent nervure joining the first cubital cell; 



antennal joints 16-19 inclusive white ashmeadi Dalle Torre. 



General color black; recurrent nervure joining the second cubital cell; antennal 

 joints beyond the 14th to the apex white, the two apical joints fuscous. 



cincticornis, new species. 



18. Mesoscutum with a median dimple-like impression or longitudinal slit in front 



of the scutellum 19. 



Mesoscutum without a median impression 32. 



19. Mesopleurae with a crenulate or foveolate impression below the middle 20. 



Mesopleural impression smooth or absent 28. 



20. Mandibles and clypeus fitting close together, without a distinct opening be- 



tween 27. 



Mandibles and clypeus separated by a distinct opening 21. 



21. Median impression on the mesoscutum slit-like, extending to or beyond the 



middle of the mesoscutum; yellowish species 22. 



Median impression on the mesoscutum not extending forward to the middle of 

 the mesoscutum; (blackish species except anastrephae) 23. 



22. Forewing from its base to apex of stigma fuscous; ovipositor nearly half as long 



as the abdomen fuscipennis, new species. 



Fore^ving not fuscous; ovipositor short canaliculatiis, new species. 



23. 0-\dpositor nearly half as long as the abdomen; body color uniformly stramine- 



ous anastrephae Viereck 



Ovipositor scarcely exserted; not uniformlj'^ stramineous 24. 



24. Head, except a spot surrounding the ocelli, yellow; antennae inserted about the 



middle of the eyes provancheri Dalle Torre. 



Head blackish ; antennae inserted a little above the middle of the eyes 25. 



25. General color piceo-succineus, the head -above, dorsum of the mesothorax, and 



apex of abdomen brownish or piceus; length about 2 mm. .succineus Gahan. 

 Head and thorax polished black 26. 



26. Abdomen except the first tergite yellow brunneiventris Cresson. 



Abdomen except the second tergite black cinctm Provancher. 



27. Mandibles with a distinct tooth on the ventral margin near the base. 



viandibularis, new species. 

 Ventral margin of the mandibles without a distinct tooth utahensis Gahan. 



28. Mandibles vfith. a distinct notch or tooth on the ventral margin near the base. . 29. 

 Ventral margin of the mandibles without a notch or tooth at base 31. 



29. Propodeum not coarsely rugose, more or less shining; stigma long and narrow; 



median impression on the mesonotum very slight, almost obsolete; first tergite 

 nearly twice as long as broad and distinctly striate; first abscissa of radius rather 



long amplus Ashmead. 



Propodeum rather coarsely rugose; stigma subtriangular; median impression on 

 the mesonotum deep and distinct 30. 



30. Length 3.5 mm basinigcr Viereck. 



Length 2.75 mm foersteri, new species. 



31. Sides of the thorax and more or less of the dorsum brown or castaneous; tegument 



surrounding the median impression on the mesoscutum rugulose. 



nigrocastaneous Viereck. 

 Thorax wholly black; mesoscutum wholly smooth color adensis, new species. 



32. Recurrent nervure joining the first cubital cell; mesoscutum conspicuously hairy 



all over 33. 



Recurrent nervure interstitial or joining the second cubital cell; mesoscutum 

 not conspicuously hairy 34. 



