606 PROCEEDINGS OF THE ACADEMY OF [Oct., 



testaceus^ is a much larger insect (male, wing 25.5 mm., abdomen 

 36 mm.), the cell 1st Mi is much larger and the petiole of cell M, is 

 very short. Mschnosoma rivertonensis Johnson,^' a paratype of which 

 is in my collection through the kindness of Mr. Johnson, is a large fly 

 (male, wing 22 mm., abdomen 30 mm.) with cell Mi entirelj' sessile. 



Explanation of Plates XXV, XXVI, XXVII. 



Plate XXV. — Fig. 1. — -Wing of LimnophUa subcoslala Alexander. 

 Fig. 2. — Wing of L. (Ephelia) johnsoni sp. n. 

 Fig. 3. — Wing of L. nigriplcura A. & L. sp. n. 

 Fig. 4. — Wing of L. itov<e-angli(B sp. n. 

 Fig. 5. — Wing of L. staxwoodcE sp. n. 

 Fig. 6. — Wing of L. osborni sp. n. 

 Fig. 7. — Wing of Tricyphotm kalahdin sp. n. 

 Fig. 8. — Wing of T. vernalis Osten Sacken. / 



Fig. 9. — Wing of Phalacrocera replicala Linnteus. 

 Fig. 10. — Wing of P. neoxetia sp. n. 

 Fig. 11. — Wing of P. tipuUna Osten Sacken. 



Plate XXVI. — Fig. 12. — Wing of Erioptera (Mesocyphona) rubia sp. n. 

 Fig. 13. — Wing of E. {Erioptera) dorolhea sp. n. 

 Fig. 14. — Wing of E. (Erioptera) microcellula sp. n. 

 Fig. 15. — Wing of E. (Empeda) alicia sp. n. 

 Fig. 16. — Hj'popygium of E. (E.) microcellula; dorsal aspect of the plcurite 



and appendages, d = dorsal appendage. 

 Fig. 17. — Hypopygium of E. (E.) microcellula; ventral aspect of the dorsal 



apical appendage. 

 Fig. 18. — Hypopygium of E. (E.) microcellula; ventral aspect of the ventral 



gonapophyses. 

 Fig. 19.— Hypopygium of E. (E.) liicia; lateral aspect of the pleurite. 

 Fig. 20. — Hypopygium of E. (E.) lucia; dorsal aspect of the pleurite. 

 Fig. 21. — Hj-popygium of Gonomijia {Leiponeura) sacandaga; dorsal aspect. 



Pl.\te XXVII. — Fig. 22. — Wing of LHcranomyia nelliana sp. n. 

 Fig. 23. — Wing of Rhipidia (Arhipidia) shannoni sp. n. 

 Fig. 24. — Wing of Teucholabis rubescens sp. n. 

 Fig. 25. — Wing of Gonomyia (Leiponeura) sacaiidaga sp. n. 

 Fig. 26. — Wing of ? Gonomyia slossonw sp. n. 

 Fig. 27. — Wing of Cladura delicatiUa sp. n. 

 Fig. 28. — Wing of LimnophUa emmelina sp. n.. 

 Fig. 29. — Wing of L. (Dactylolabis) hortensia sp. n. 

 Fig. 30. — Wing of KhaphidoUibis polymeroides sp. n. 

 Fig. 31. — Wing of Dicranota pallida sp. n. 

 Fig. 32. — Wing of Longurio minimus sp. n. 



■^'Berlin. Enlomol. ZeUschr., vol. 13, p. 3; 1869. 



"Proceedings of lite Boston Society of Natural History, vol. 34, p. 116, pi. 16, 

 figs. 13-15; 1909. 



