48 BULLETIN 143, UNITED STATES NATIONAL MUSEUM 



46. Pubescence of third abdominal tergite black, except extreme lateral mar- 



gins silvery; iiosterior face of propodeum with a thin brush of golden 



pubescence campanula (p. 178) . 



Pubescence of third abdominal tergite entirely silvery ; posterior face of 

 propodeum with only sparse, scattered pubescence anguliceps (p. 178). 



47. Antennal scrobes strongly carinate above, the carina extending from the 



autennal tubercles almost to the margins of the eyes 72. 



Antennal scrobes weakly carinate, or not at all carinate above ; if weakly 

 carinate, the carina extends a little more than half the distance from the 

 antennal tubercles to the margins of the eyes 48. 



48. Antennal scrobes feebly carinate above, the carina extending a little more 



than half the distance between the antennal tubercles and the eyes 49. 



Antennal scrobes not at all carinate above 52. 



49. Segments 3-10 of the flagellum broadly, deeply, longitudinally sulcate dor- 



sally sulcatulla (p. 105). 



Flagellar segments, all normal, not sulcate 50. 



50. Pygidium rugose; dorsal areas of head, tliorax, and abdomen clothed with 



long, dense, erect, scarlet pubescence flammlfera (p. 240). 



Pygidium distinctly longitudinally striate ; pubescence not scarlet 51. 



51. Pubescence of head and thorax black, not concolorous with that of the 



abdomen raelanippe (p. 152). 



Pubescence of vertex and dorsum of thorax orange rufous, concolorous with 

 that of the abdomen melanippe var. conformis (p. 153). 



52. Pygidium irregularly rugose 53. 



Pygidium longitudinally sti'iate 54. 



53. Pubescence of body above white clytemnestra (p. 126). 



Pupescence of body above varying from light yellow to red. 



coccineohirta (p. 124). 



54. Head wider than the thorax .55. 



Head sometimes almo.st as wide, but not wider than the thorax 56. 



55. Head and thorax with black pubescence ; abdomen with red pubescence. 



gorgon (p. 247). 

 Head, thorax, and abdomen with yellowish pubescence leda (p. 249). 



56. Pubescence of abdominal tergites 2-5 concolorous ; pubescence of head and 



thorax entirely black lauta (p. 154). 



Pubescence of abdominal tergites 2-5 not concolorous ; pubescence of head 

 and thorax colored otherwise 57. 



57. Posterior face of propodeum conspicuously clothed with silvery or very pale 



golden pubescence 67. 



Posterior face of propodeum either almost bare, or clothed with ferruginous 

 or yellow pubescence 58. 



58. Postero-lateral angles of head angulate ; posterior face of propodeum deeply, 



coarsely foveolate, almost bare .'.rugulosa (p. 187), 



Postero-lateral angles of head rounded, not at all angulate 59. 



59. Abdominal sternites clothed with black pubescence 60. 



Abdominal sternites clothed with pale silvery pubescence 61. 



60. Disk of second abdominal tergite with large, close elongate punctures ; 



dorsum of thorax and abdomen with sparse, mostly appressed pubescence. 



praegrandis (p. 148). 

 Disk of second abdominal tergite with moderate, distinct, irregular punc- 

 tures ; dorsum of thorax and abdomen with moderately dense, erect, and 

 appressed pubescence creusa (p. 140). 



