Dec, IQ03.] SnODGRASS : TERMINAL SEGMENTS OF TlPULID^. 181 



Dicranomyia venusta Berg. (PI. XI, Figs. 12 and 14.) 



Very similar to Tipula. The eighth tergum is narrow above, 

 widened on the sides (Fig. 14, VIII i). The eighth sternum is 

 prolonged posteriorly beneath the ninth and tenth, and terminates in 

 two blade-like appendages (<?). The ninth tergum is a narrow band 

 back of the eighth. The ninth sternum (Fig. 12) is a curved trans- 

 verse bar of chitin bearing a median bar projecting caudally. This 

 supports a free membranous flap on the dorsal wall of the genital 

 chamber. The tenth segment is comparatively long and supports two 

 curved, tapering cerci. 



Dicranomyia longipennis Schtim. 



In this species the appendages of the eighth sternum are longer 

 than in the last, and the ninth sternum is a simple transverse bar of 

 chitin. Otherwise the two species are alike. 



Symplecta punctipennis O. S. (PI. XI, Fig. 15.) 



Very similar to Dicranomyia, differing in the proportionally larger 

 and strongly up-curved cerci of the tenth segment. 



Limnophila sciophila O. S. (PI. XI, Fig. 17.) 



Very similar to Dicranomyia and Symplecta. The eighth sternum 

 short but its appendages (<?) large. Cerci long, slender and curved. 

 Ninth sternum is a sinuous transverse bar of chitin bearing a median 

 rod projecting posteriorly as in Dicranomyia vefiusta and supporting 

 a long triangular membranous flap (Fig. 17, gon. 2). 



Antocha opalizans O. S. 



Does not differ from the last. 

 Dicranoptycha scabrina. 



Tenth segment rather elongate and the cerci spatulate in form. 

 Erioptera caloptera Say and E. septentrionis O. S. 



Differ in no way from the foregoing genera. The cerci are curved 

 upward. 



Epiphragma forcipennis Say (PI. XI, Fig. 18) and Trimicra ano- 

 mala O. S. 



In both of these forms the cerci are rather large and strongly bent 

 upward. 



Amalopis constans Doane and A. inconstans O. S. 



Very similar to Epiphragma and Trimicra. 



