INVESTIGATION'S OlST THE MUTILLID WASPS 45 



KEY TO THE SPECIES 



Females 



1. Apices of middle and hind femora squarely truncate, the surface of the 



outer lobe of the truncation sulcate 85. 



Apices of middle and hind femora more or less rounded, not modified as 

 above 2. 



2. Dorsum of thorax longer than broad by actual measurement, usually very 



distinctly longer than broad 19. 



Dorsum of thorax as broad, sometimes slightly broader than it is long, by 

 actual measurement 3. 



3. Entire body and legs clothed with ivory-white pubescence thetis (p. 78). 



Pubescence of body and legs colored otherwise 4. 



4. Second abdominal sternite scabrous at the sides and apex 5. 



Second abdominal sternite not at all scabrous; punctate 7. 



5. Pubescence of abdominal tergites 2-5 concolorous 6. 



Apical fringe of tergite two, and pubescence of tergite 3 entirely, black. 



furina (p. 82). 



6. Metapleura, propodeum, first abdominal tergite, and basal margin of second 



tergite sparsely clothed with black hairs eminentia (p. 79). 



Entire insect clothed with pale pubescence, except basal median spot of 

 second tergite, black scabra (p. 79). 



7. Head distinctly broader than the thorax 8. 



Head narrower than the thorax 9. 



8. Carina of first sternite produced anteriorly into a blunt tooth; area of 



golden yellow pubescence on abdomen above with an anterior median 



emargination aureola (p. 251) . 



Carina of first sternite prominent but not produced into a tooth anteriorly ; 

 area of scarlet pubescence on abdomen above without an anterior mediar 

 emargination aureola var. pacifica (p. 2.53), 



9. Antennal scrobes carinate above 10. 



Antennal scrobes not carinate above 13. 



10. Thorax with a distinct scutellar scale; pygidium longitudinally rugose; 



vestiture white and black nocturna, (p. 279). 



Thorax without a scutellar scale; pygidium irregularly rugose; no white 

 pubescence in the vestiture 11. 



11. Head and thorax entirely black zelaya (p. 120). 



Pubescence of head and thorax ferruginous 12. 



12. Pubescence of tergites 3-5 black, at least laterally homole (p. 72). 



Pubescence of tergites 3-5 entirely bright red to yellow__fulvohirta (p. 66). 



13. Mandibles bidentate, that is, acute at the apex, unidentate on the inner 



margin 17 



Mandibles tridentate, that is, acute at the apex, bidentate subapically on 

 the inner margin 14. 



14. Head and thorax black waco (p. 63). 



Head and thorax ferruginous 15. 



15. Pubescence of abdomen beneath black 16. 



Pubescence of abdomen beneath pale harmonla (p. 56). 



16. Apical fringe of tergite 2 entirely black, pubescence of tergites 3-5 entirely 



black nigricauda (p. 64). 



Apical fringe of tergite 2 pale medially and laterally, tergite 3 mostly pale, 

 tergites 4 and 5 pale, except for erect, dark hairs — montivagoides (p. 64). 



