T. D. A. COCKERELL 37 



2. Abdomen without white hair-marks on apical part. (Colombia) 



Melissodes atramentata Cockerell 

 Abdomen with white hair-marks or band on apical part 3 



3. Wings very dark; abdomen with an interrupted white band on fourth 



segment. (Mexico) Melissodes bimaculata morrilli Cockerell 



Wings not so dark; abdomen with onh' lateral quadrate white patches ... 4 



4. Larger, mandibles with liright orange stripe. 



Svastra carcaranensis Cockerell 

 Smaller, mandibles without orange stripe. 



Svastra reductior Cockerell 



5. Females 6 



Males 14 



G. Clypeus marked with yellow Tetralonia gilva Holmberg 



Clypeus without yellow marking 7 



7. Hair of thorax above bright fulvous 8 



Hair of thorax above pale gray or white; species smaller 9 



Hair of thorax above with at least some black or fu.scous 10 



8. AV:)domen with three golden bands. 



Thygater bifasciata buccosa (\'achal) 

 Abdomen covered with fulvous hair. Xenoglossodes mimetica (Brethes) 



9. Second abdominal segment vmiformly covered with pale hair. (Mexico) 



Dasiapis tropicalis Cockerell 

 Second abdominal segment api)earing dark Ijasally. 



Diadasia callura Cockerell 



10. Second abdominal segment uniformly covered with pale fulvous hair. 



Tetralonia brethesi Jorgensen 

 Second abdominal segment not thus covered 11 



11. Sides of metathorax with red hair; pleura with black hair. 



Thygater bruneri Cockerell 

 Sides of metathorax with hair not red 12 



12. Fringe on fifth abdominal segment red or fulvous 13 



Fringe on fifth abdominal segment black. 



Melissodes nigroaenea (Smith), var. 



13. Apical margin of second abdominal segment l^roadl}- pallid. (Mexico) 



Xenoglossa rhodophila Cockerell 

 Apical margin of second abdominal segment not ])alli(l. (Paraguay) 



Svastra sapucacensis Cockerell 



14. Clypeus wholly or mainly black. Melissoptila pulchricornis Cockerell 

 Clypeus yellow or cream-color 15 



15. Flagellum black Tetralonia gilva Holmberg 



Flagellum red beneath 16 



IG. Second abdominal segment covered with fulvous hair 17 



Second abdominal segment not thus covered IS 



17. Two submarginal cells; clj'peus lemon yellow. 



Xenoglossodes lusor Cockerell 

 Three submarginal cells; clypeus creamy white. 



Xenoglossodes manca Cockerell 



TH.^NS. .\M. ENT. SOC, XLIV. 



