191G.] NATURAL SCIENCES OF PHILADELPHIA. 547 



Fig. <>. — Wing of G. lachrymalis Alexander. 



Fig. 7. -Wing of G. rostrata Saj . 



Fig. 8. Wing of G. ibis sp. a. 



Fig. 9. -Wing of G. insignia Loew. 



Fig. 10. -Wing of Dicranoptycha germana Osten Sacken. 



Fig. 11. — Wing nf I), sobrina <>>ten Sacken. 



Fig. L2. -Winy, nt' l>. winnemana sp. n. 



Fig. 13. — Wing of Rhamphidia flavipes Macquart. 



Fig. 14. — Wing of R. mainensis sp. n. 



Fig. 1"). -Wing of Teuckolabis complexa Osten Sacken. 



Fig. Hi. — Wing of T. lucida Alexander. 



Plate XXVI. -Fig. 17. — Wins of Gonomyia (Leiponeura) aUxanderi Johnson. 

 Fig. IS. — -Wing of G. (L.) cinerea Doane. 

 Fig. 19. -Wing of G. (L.) sacandaga Alexander. 

 Fig. 20. — Wing of G. (L.) pleuralis Williston. 

 Fig. 21. — Wing of G. (L.) puer Alexander. 

 Fig. 22.- -Wing of G. (L.) manca Osten Sacken. 

 Fig. 23. — Wing of G. (Gonomyia) mathesoni Alexander. 

 Fig. 24. — Wing of G. (G.) blanda Osten Sacken. 

 Fig. 25. — Wing of G. (G.) calif ornica Alexander. 

 Fig. 26. — Wing of G. ((?.) svlphurella Osten Sacken. 

 Fig. 27. — Wing of G. (G.) flavibasis Alexander. 

 Fig. 28.— Wing of G. (G.) florens Alexander. 

 Fig. 29. — Wing of G. (G.) cognatella Osten Sacken. 

 Fig. 30. — Wing of G. (G.) noueboracensis Alexander. 

 Fig. 31. — Wing of G. (G.) filicauda Alexander. 

 Fig. 32. — Wing of G. (G.) virgata Doane. 

 Fig. 33. — Wing of G. (G.) subcinerea Osten Sacken. 



Plate XXVII.— Fig. 34. — Wing of Erioptera (Erioptera) laticeps sp. n. 

 Fig. 35. — Wing of E. (Mesocyphona) tantilla sp. n. 

 Fig. 36. — Wing of E. (Empeda) nyctops sp. n. 

 Fig. 37. — Wing of Molophilus fultonensis sp. n. 

 Fig. 38. — Wing of M. nova-ccesariensis sp. n. 

 Fig. 39. — Wing of M. ursinus Osten Sacken. 

 Fig. 40. — Wing of Empedomorpha empedoides Alexander d". 

 Fig. 41. — Wing of Rhabdomaslix (Sacandaga) nionticola sp. n. 

 Fig. 42. — Wing of R. (S.) caudata Lundbeck. 

 Fig. 43. — Wing of R. (S.) flava Alexander. 

 Fig. 44. — Wing of Pterochionea bradleyi sp. n. 

 Fig. 45. — Wing of Limnophila edwardi sp. n. 

 Fig. 46. — Wing of L. sylvia sp. n. 



Plate XXVIII. — Fig. 47. — Wing of Tricyphona inconstans Osten Sacken. 

 Fig. 48. — Wing of T. calcar Osten Sacken. 

 Fig. 49. — Wing of T. auripennis Osten Sacken. 

 Fig. 50. — Wing of T. hyperborea Osten Sacken. 

 Fig. 51. — Wing of T. katahdin Alexander. 

 Fig. 52. — Wing of T. vernalis Osten Sacken. 

 Fig. 53. — Wing of T. paludicola sp. n. 



Fig. 54. — Wing of Rhaphidolabis (Rhaphidolabina) flaveola Osten Sacken. 

 Fig. 55. — Wing of R. (Plectromyia) modesta Osten Sacken. 

 Fig. 56. — Wing of R. (Rhaphidolabis) tenuipes Osten Sacken. 

 Fig. 57. — Wing of R. (R.) cayuga sp. n. 

 Fig. 58. — Wing of R. (R.) rubescens sp. n. 



Plate XXIX. — Fig. 59. — Hypopygium of Gonomyia (Leiponeura) alexanderi; 

 dorsal aspect of the pleural appendages; d = dorsal appendage; v = ven- 

 tral appendage. 

 Fig. 60. — Hypopygium of G. (L.) helophila Alexander; dorsal aspectTof the 

 pleural appendages; lettering as in Fig. 59. 



