10 PEOCEEDINGS OF THE NATIOXAL MUSEUM. vol. 60. 



Stigmal plate not broader above ; puparium elongated. 



(No. 81) Sturmia nigrita Townsend. 



38. Stigmal plates near apex of puparium ; two upper slits nearly parallel 39 



Stigmal plates remote from apex ; two upper slits not parallel 40 



39. AU three slits of equal length; button fairly distinct. 



(No. 82) Frontina tenthredinidarum Townsend. 



Two outer slits converge toward the button ; inner slit slightly longer than 



either of the other tw'o (No. 83) Exorista nigripalpis Townsend. 



40. Stigmal plates round or oval; slits large 41 



Stigmal plates small 42 



41. Two outer slits straight, slightly bent at the base. 



(No. 84) Exorista griseomicans Van der Wulp. 

 Inner slit large, straight, nearly perpendicular, other slits small, close to- 

 gether (No. 85) Phorocera flavicauda Van der Wulp. 



42. Stigmal plates very small ; ridges low and weaJc. 



(No. 86) Panzeria radicum Fabricius. 

 Stigmal plates large; ridges strong and prominent 43 



43. Ridges of plate touching each other ; middle slit horizontal. 



(No. 87) Zelia, species. 

 Ridges of plate not touching 44 



44. Puparium with a depression dorsally 45 



Puparium without a depression dorsally 46 



45. Ridges very broad and well separated (No. 88) Exorista, species (13675b). 



Ridges much longer and close together (No. 89) Masicera rutila Meigen. 



46. Lower slit in stigmal plate horizontal 47 



Lower slit in stigmal plate not horizontal 52 



47. Button on inner edge of plate 48 



Button not on inner edge of plate 49 



48. Puparium slightly depressed dorsally on the posterior end. 



(No. 90) Admontia demylus Walker. 



Puparium slightly flattened on posterior end ; an elevation below the stigmal 



plates (No. 91) Phorocera, species (near macra). 



49. Ridges taper to a narrow point at one end 50 



Ridges do not taper to a point 51 



50. All the ridges taper to a point at one end. 



(No. 92) Panzeria ampelus Townsend. 

 Middle ridge tapers to a point at one end. 



(No. 93) Exorista futilis Osten Sacken. 



51. Ridges about equal in size ; a round elevation centrally depressed below the 



plates (No. 94) Phorocera claripennis Maequart. 



Not as above 52 



52. Stigmal plate with a very narrow ridge nearly encircling it. 



(No. 95) Winthemia quadripustulata Fabricius. 

 Stigmal plate not as above 53 



53. Puparium and ridges large 54 



Puparium and ridges not large 55 



54. Lower slit directed obliquely downward ; puparium elongated. 



(No. 98) Uromacquartia halisidotae Townsend. 

 Lower slit perpendicular (No. 97) Trichophora ruficauda Van der Wulp. 



55. Puparium small; ridges large, well developed. 



(No. 98) Sturmia occidentalis Coquillett. 

 Puparium larger ; ridges narrow, not well defined. 



(No. 99) Sturmia albifrons Walker. 



