606 PROCEEDINGS OF THE ACADEMY OF [Oct., 



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

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

 very short. lEschnosoma rivertonensis Johnson,^! a paratype of which 

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

 (malcj wing 22 mm., abdomen 30 mm.) with cell Mi entirely sessile. 



Explanation of Plates XXV, XXVI, XXVII. 



Plate XXV. — Fig. 1. — Wing of Ldmnophila subcostata Alexander. 

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

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

 Fig. 4. — Wing of L. novoe-anglice sp. n. 

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

 Fig. 6. — Wing of L. osborni sp. n. 

 Fig. 7. — -Wing of Tricyphona katahdin sp. n. 

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

 Fig. 9. — Wing of Phalacrocera replicata Linnaeus. 

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

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



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

 Fig. 13. — Wing of E. (Erioptera) dorothea sp. n. 

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

 J'ig. 15. — Wing of E. (Empeda) alicia sp. n. 

 Fig. 16. — Hypopygium of E. (E.) microceUula; dorsal aspect of the pleurite 



and appendages, d = dorsal appendage. 

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



apical appendage. 

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



gonapophyses. 

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

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

 Fig. 21. — Hypopygium of Gonomyia (Leiponeura) sacandaga; dorsal aspect. 



Plate XXVII. — Fig. 22. — Wing of Dicranomyia nelliana sp. n. 

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

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

 J'ig. 2.5. — Wing of Gonomyia (Leiponeura) sacandaga sp. n. 

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

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

 Fig. 28. — Wing of Limnophila emmelina sp. n. , 

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

 Fig. 30. — \\'ing of lihaphidolabis polymeroides sp. n. 

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

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



^"Berlin. Entomol. Zeilsckr., vol. 13, p. 3; 1869. 



'^^ Proceedings of the Boston Society of Natural History, vol. 34, p. 116, pi. 16, 

 figs. 13-15; 1909. 



