10 PROCEEDINGS OF THE NATIONAL MUSEUM vol.82 



4. Prothorax with two dark spots anteriorly, elytra with very indistinct traces 



of sutural, median, and sometimes submarginal vittae ; Arizona. 



figurata (p. 35). 



Prothorax entirely pale or with vague reddish markings ; North Carolina 



to Florida 5 



5. Small (5 mm), elytra costate in female, usually traces of pale reddish pro- 



notal spots, elytra pale reddish (in well-marked specimens paler yellow 

 sutural, median, and marginal vittae) ; North Carolina to Florida, 



conjugata (p. 14). 



Larger (6 to 7 mm), elytra not costate, entirely pale yellow, no trace of 



vittae; Florida Keys antennata (p. 46). 



6. Head entirely pale, apical angle of lateral margin of prothorax unusually 



broad and notched behind the apex on margin ; Texas, southern California. 



varicornis (p. 60). 

 Head entirely dark or bicolored 7 



7. Head entirely dark - 8 



Head bicolored 9 



8. Head coarsely and densely punctate, ventral surface and legs entirely dark. 



triangularis (p. 57). 



Head smooth, or with a few punctures across occiput and front, abdomen 



usually with pale margin or pale last ventral segment, sometimes entire 



abdomen pale, femora often pale at base xanthomelas (p. 55). 



9. Femora bicolored, elytra very lustrous and densely punctate. 



politula (p. 59). 

 Femora pale, elytra not so lustrous and not densely punctate 10 



10. Prothorax and elytra distinctly punctate ; New Mexico and Colorado. 



semicarbonata (p. 54). 

 Prothorax and elytra finely and often indistinctly punctate ; Kansas east- 

 ward collata (p. 52). 



11. Shining, indistinctly punctate, femora and margin of abdomen usually pale ; 



Atlantic coast to Arizona glabrata (p. 49). 



Only feebly shining, coarsely punctate, femora and abdomen dark; California 

 and Nevada maritima (p. 51). 



12. Elytra with broad discoidal dark spot discoidea (p. 43). 



Elytra vittate 13 



13. Elytra pale with pale reddish or obsolete grayish vittae 14 



Elytra pale with dark brown or black vittae 15 



14. Large (6 to 7 mm), elytra with obsolete or grayish vittae, no traces of costae, 



prothorax with 2 dark spots; Arizona, Nevada figurata (p. 35). 



Smaller (5 mm), elytra with pale reddish vittae, markedly costate in female, 

 prothorax usually with pale reddish spots; North Carolina to Florida. 



conjugata (p. 14). 



15. Elytra with sutural and submarginal vittae, no median vittu or only traces 



of it 16 



Elytra with sutural and median vittae, no submarginal vitta or only 



indistinct traces of it 17 



Elytra with sutural, median, and submarginal vittae 21 



16. Head pale except for narrow occipital band, tubercles sometimes dark and 



labrum usually brown alternata (p. 20). 



Head dark except about antennal sockets and sometimes a pale streak on 

 lower edge of clypeus limbicollis (p. 19). 



17. Prothorax without spots 18 



Prothorax spotted 19 



