18 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. C5. 



BIBLIOGRAPHY. 



1850-56. Walkeh, Fkancis. — Insecta Saundersiana, Diptera, p. 211. 

 1857. LoEW, H. — Neue Beitrage, part 5, p. 22. 



1857. . — Neue Beitrage, part 8, p. 70, species 1. 



1864. . — Monograplis of North American Diptera, part 2. Dolichopo- 



didae, pp. 200-211. 



1877. OsTEN Sacken, C. R. — Western Diptera : Descriptions of new genera and 



species of Diptera from tlie region west of tlie Mississippi and espe- 

 cially from California. Bulletin of the U. S. Geological and Geographi- 

 cal Survey of the Territories, vol. 3, no. 2, April, 1877, pp. 189-354. 



1878. . — Catalogue of the Described Diptera of North America (sec- 

 ond edition). Smithsonian Miscellaneous Collections, vol. 16, pp. xliv 

 and 276, Washington, D. C. 



1905. Aldkich, J. M. — Catalogue of North America Diptera, Smithsonian Mis- 

 cellaneous Collections, No. 1444, part of volume 46, pp. 297-298. 

 1907. . — The Dipterous Genus Scellus, with one new species. Ento- 

 mological News, April, 1007, pp. 133-136. 

 1923. CuuRAN, C. H. — An Apparently Undescribed Species of Scellus (Dolicho- 

 podidae, Diptera). Canadian Entomologist, vol. 55, No. 3. March, 1023, 

 pp. 7^-74. 



EXPLANATION OF PLATES. 

 All drawings made by C. T. Greene. 

 Plate 1. 

 Fig. 1. Scellus spinimanus (Zetterstedt). Abdomen of male. 



2. Scellus vigil Osten Sacken. Abdomen of male. 



3. Scellus amplus Curran. Abdomen of male. 



4. Scellus exustns (Walker). Abdomen of male. 



5. Scellus flliferus Loew. Abdomen of male. 



6. Scellus monstrosus Osten Sacken. Abdomen of male. 



7. Scellus avidus Loew. Abdomen of male. 



8. Scellus virago Aldrich. Abdomen of male. 



Plate 2. 

 Fig. 9. Scellus spinimanus (Zetterstedt). Front leg of male. 



10. Scellus vigil Osten Sacken. Front leg of male. 



11. Scellus amplus Curran. Front leg of male. 



12. Scellus exustus (Walker). Front leg of male. 



13. Scellus monstrosus Osten Sacken. Front leg of male. 



14. Scellus filiferus Loew. Front leg of male. 



15. Scellus virago Aldrich. Front leg of male. 



16. Scellus avidus Loew. Front leg of male. 



17. Scellus filiferus Loew. Front leg of female. 



18. Scellus exustus (Walker). Front leg of female. 



19. Scellus virago Aldrich. Front leg of female. 



20. Scellus monstrosus Osten Sacken. Front leg of female. 



21. Scellus amplus Curran. Front leg of female. 



22. Scellus avidus lioew. Front leg of female. 



23. Scellus vigil Osten Sacken. Front leg of female. 



Plate 3. 

 Fig. 24. Scellus spinimanus (Zetterstedt). Middle leg of male. 



25. Scellus exustus (Walker). Hind leg of male. 



26. Scellus mmistrosus Osten Sacken. Middle leg of male. 



27. Scellus monstrosus Osten Sacken. Hind leg of male. 



28. Scellus virago Aldrich. Middle tibia of male. 



29. Scellus filiferus Loew. Middle leg of male. 



30. Scellus vigil Osten Sacken. Middle leg of male. 



