THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 11 



24. Cilia of hind femora as long as the width of the femora (Labrador). 



No. 43, pacJcardi, new species. 

 Cilia of hind femora not much over half as long as the width of the femora. .. 25. 



25. Lamellae of hypopygium with a large, almost angulated, upward projection at 



apex (New York) No. 41, aequalis, new species. 



Lamellae somewhat triangular, with a very small projection above at apex 

 (Louisiana; Indiana) No. 46, alacer, new species. 



26. Head without any yellow bristles below near the proboscis; wings with a brown 



cloud (Nevada) No. 36, nubifer, new species. 



Head with two or three yellow bristles below near the proboscis; wings without 

 a brown cloud (New York) No. 41, aequalis, new species. 



27. Lamellae of the hypopygium small, wholly black (Idaho). 



No. 25, beatus, new species. 

 Lamellae of normal size, not wholly black 28. 



28. Wings grayish hyaline (Eastern States) No. 30, calcaratus Aldrich. 



Wings more or less clouded with brown 29 . 



29. Wings uniformly infuscated (New Jersey; Maryland). .No. 32, jo/msomi Aldrich. 

 Wings %vith a large conspicuous cloud beyond the middle (Colorado). 



No. 47, pariitus Melander and Brues. 



Group C. 



1. Cilia of the calypters pale 2. 



Cilia of the calypters black 6. 



2. Costa considerably enlarged before the tip of first vein (Montana). 



No. 7, viridis, new species. 

 Costa not or but little enlarged at tip of first vein 3. 



3. Hypopygial lamellae blackish (Colorado; Idaho; Washington; Nevada). 



No. 9, nigricauda, new species. 

 Hypopygial lamellae whitish with a black border 4, 



4. All joints of middle tarsi slightly compressed (Idaho; Nevada; Utah; California). 



No. 6, squamosus, new species. 

 All joints of middle tarsi normal 5. 



5. Lamellae of the hypopygium somewhat quadrangular in outline (Colorado). 



No. 15, enigvia Melander and Brues. 

 Lamellae somewhat triangular in outline (California).. No. 5,formosus, new species. 



6. Fifth joint of fore tarsi enlarged; second and third joints yellowish; hind femora 



ciliated (Hudson Bay Territory) No. 18, tetricus Loew. 



Fifth joint of fore tarsi plain 7 . 



7. Hind femora ciliated on loAver inner edge 8. 



Hind femora without cilia on the lower edge 12. 



8. Hypopygial lamellae blackish (Eastern States) No. 14, detersus Loew. 



Hypopygial lamellae whitish with a black border 9. 



9. Fore tarsi over one and one-half times as long as their tibiae (Kansas). 



No. 13, kansensis Aldrich. 

 Fore tarsi not over one and one-fourth times as long as their tibiae 10. 



10. Middle and hind femora each with two preapical bristles, placed one before 



the other; face brownish (Colorado; Idaho; Nevada). 



No. 16, adaequatus, new species 

 Middle and hind femora each with only one preapical bristle 11. 



11. Face rather wide; costa with a small knotlike enlargement at tip of first vein 



(Colorado) No. 15, enigma Melander and Brues. 



Face narrow; costa without any enlargement at the tip of first vein (western). 



No. 11, myosota Osten Sacken. 



