CHARLES W. HOOKER, 57 



10. Vertex yellow 11. 



Vertex black 16. 



11. Apex of abdomen black 12. 



Apex of abdomen not black 13. 



12. Discocubital cell with one macula nigricauda Tasch. 



Discocubital cell with one macula and two lines. 



thoracicus Cress. 



13. Stigma red flavoscutellatus Br. 



Stigma yellow 14. 



14. Discocubital cell with one macula and two lines.. thoracicus Cr. 

 Discocubital cell with one macula 15. 



15. Stigma pale flavous guateinalensis Cam. 



Stigma fulvous neotropiciis n. sp. 



16. Abdomen entirely red bruUei. 



Abdomen not entirely red 17. 



17. Abdomen with three basal segments red, the rest yellow. 



trilineatus Br. 

 Abdomen with three basal segments yellow 18. 



18. Larger macula with outer end sharply pointed flavus Fabr. 



Larger macula with outer end rounded. concolor Cress. 



19. Larger macula appendiculate 20. 



Larger macula not appendiculate 22. 



20. Discocubital cell with two maculae, the larger with along appendix 



extending below the smaller purgatus arcuatus Felt. 



Larger macula with only a short appendix 21. 



21. Sternum and stigma (except base and apex) black. 



maculipennis Cress. 

 Sternum and stigma yellow... 23. 



22. Face with distinct median tubercle between the antennal fossae. 



sphacelatus Erich. 



Face without distinct median tubercle between the antennal 



fossae 26. 



23. Discocubital cell with two maculae and often a line — the detached 



appendix of the larger macula — under the smaller. 



purg-atus Say. 

 Discocubital cell with only two maculae 24. 



24. Outer macula erect crescentic 25. 



Outer macula not erect crescentic concolor Cress. 



25. Outer macula with horns pointed towards the apex of the wing. 



cubensis Nort. 

 Outer macula with horns pointed towards the body. 



fernaldi n. sp. 



26. Smaller macula erect crescentic cubensis Nort. 



Smaller macula not erect crescentic 27. 



27. Abdomen yellow purg-atus Say. 



Abdomen not yellow flaviceps Br. 



TRANS. AM. KNT. SOC, XXXVIII. (8) 



