1903] MELAXDER : — XORTH AMERICAN SPECIES OF AMMOPIIILA 161 



Species of other character, the metanotum onlj rarely with a median line . . 50- 



50. Face covered with golden pubescence ; abdomen largely reddish ; cljpeus not pro- 



duced . . . . . . • • ■ • • • • • • 51- 



Pubescence of face of other color, if golden the abdomen is black and the cljpeus of the 

 male is produced ............. 5- • 



51. Punctures of thorax fine and sparse; scutellum strongly furrowed 



57. chiriquensis Cam. 

 Punctures of thorax close; scutellum rugose 53. dejecta Cam. 



52. Head and thorax with sparse black but no silvery pubescence .... 53. 

 Pubescence of head (inclusive of face) and thorax in part silvery, gray, or fuscous 55. 



53. Mesonotum strigose or very thickly punctate towards the sides. Eastern species. 



14. tirnaria Dahlb. 

 Mesonotum simply punctate. Mexican species ....... 54- 



54. Ground color black over all 40. iridipemiis Cam. 



Abdomen with the second segment red 50. consors Cam. 



55. Scutellum sparsely punctate 5^- 



Scutellum deeply channeled longitudinally ........ 59- 



56. Silvery mark of mesopieurae elongate ; base of abdomen red .... 57. 

 Pleural spots short; abdomen nearly black; third submarginal cell narrow ; clypeus of 



male produced .........•■•. 5^- 



57. Dorsal furrow of mesonotum deep 35- strenua Cress. 



Dorsal furrow of mesonotum indistinct 52. montezuma Cam. 



58. Metapleurae finely rugulose; third antennal joint nearly twice the length of the second 



13. abbrcviata Fabr. 

 Metapleurae coarsely striated ; third antennal joint one fourth longer than the fourth 



37. miliar is Cam. 



59. Thorax nearly inipunctate, but covered with dense silvery pubescence ; slender species 



36. juncea Cress. 

 Thorax strongly punctured, its pubescence with long darker hairs intermixed. Mexican 



species 



60. 



60. Third submarginal cell twice as wide at the bottom as at the top 55. azteca C'A.m. 

 Third submarginal only one fourth longer at the bottom than at the top — gracilis Cam. 



61. Wings blackish; thorax black-sericeous; pubescence dense $^ or sparser $ 



15. nigricans Dahlb. 

 Wings sub- or fusco-hyaline ........... 62. 



62. Abdomen without red markings .......... 63. 



Abdomen in part red ............. 65. 



63 Blue-black species ; pleurae more or less shining ; face with sparse silvery pubescence 64. 

 Black species; pleurae opaque ...... 41. centralis Cixva. 



64. Pubescence sparse ; hind tibiae with fulvous hairs . . . 38. gnu/ncri Cam. 

 Pubescence dense, fuscous ; legs with almost no hairs . . . 39. micans Cam. 



65. Thorax opaque matte velvet-black on the sides ; species of the United States . 66. 

 Pleurae not matte-black .67. 



66. A spot of golden pubescence above the base of the middle and hind coxae 



31. exfrcmitata Cres^. 

 No such spots present ..... cxtretnitata var. ficiipcn>iis Walsh. 



67. Pro- and meso-thorax silvery pruinose. Cuba. .... 62. giierinii D. T. 



