426 Mr. Claude Morley on the 



Homoporus, Thorns. 



(30). 1. Areolet wanting (ISyrphocto- 



nus, Forst.). 

 (19). 2. Metathoracic arese not entirely 



wanting. 

 (14). 3. Second segment transverse ; 



anus often somewhat dull. 

 (11). 4. Basal area distinct and entire ; 



hind tibi;e not white. 

 (8). 5. Notauli wanting ; scutellum 



pale. 

 (7). 6. Femora entirely, abdomen not 



broadly, red 1. ductus, Grav. 



(6). 7. Femora basally black ; abdomen 



usually broadly red .... 2. bizonarius, Grav. 

 (5). 8. Notauli distinct ; scutellum 



black. 

 (10). 9. Hind femora black ; orbits 



alone pale 3. graculus, Grav. 



(9). 10. Hind femora red ; face im- 

 maculate 4. brevitarsis, Thorns. 



(4). 11. Basal area obsolete ; hind tibiae 



white. 

 (13). 12. Scutellum, and often the meso- 



notum and pleurae, red . . 5. pedoratorius, Gr. 

 (12). 13. Scutellum centrally black, apex 



or also the sides flavous . . 6. alpinus, Holmgr. 

 (3). 14. Second segment quadrate ; anus 



strongly nitidulous. 

 (16). 15. Clypeus convex ; antennae 



shorter than expanded wings 7. caudatus, Thorns. 

 (15). 16. Clypeus deplanate ; antennae 



as long as expanded wings. 

 (18). 17. Coxae red ; epistoma immacu- 

 late ; second segment striolate 8. longipes, Holmgr. 

 (17). 18. Coxa? black ; epistoma pale ; 



second segment not striolate . 9. punctiventris, Th. 

 (2). 19. Metathoracic areae entirely 



wanting. 

 (21). 20. Scutellum subtumidous, im- 

 maculate 10. borealis, Holmgr. 



(20). 21. Scutellum normal, nearly 



always pale. 



