Dec, 1903.] Snodgrass : Terminal Segments of Tipulid.e. 179 



Tipula retusa Doane. (PI. X, Fig. 3.) 



This species differs from T. ani:;i/sfipennis chiefly in the shape of 

 the cerci (cer.'). Instead of being long and tapering they are shorter 

 and expanded terminally where they bear four small points. At the 

 base of each is a sharp point on the tenth tergum. The appendages 

 ((?) of the eighth sternum are slightly curved upward. The ninth 

 sternum is a slender V-shaped bar with the apex drawn out posteriorly 

 into a sharp point. The first gonapophyses are represented by two 

 small triangular plates on the floor of the genital chamber with a 

 slender rod between them. Neither the plates nor the rod project 

 from the chamber wall. 

 Tipula unicincta Doane. (PI. X, Fig. 4.) 



Externally the abdomen of this species is almost identically the same 

 as that of T. bella. The ninth sternum is considerably different, how- 

 ever, as is shown in Fig. 4. It consists of two lateral, curved bars 

 with a slender, tapering plate between their tips. 

 Tipula acuta Doane. (PI. XI, Fig. 13.) 



Externally very similar to T. angitsiipennis, differing only in the 

 slightly longer tenth segment and shorter cerci. The ninth sternum 

 (Fig. 13) is a very slender V-shaped rod with the apex drawn out 

 posteriorly into a long parallel-sided point. On the floor of the gen- 

 ital chamber is imbedded a small chitinous rod. 

 Tipula carinata Z>^^/;^. (PI. XI, Fig. 11.) 



Eighth sternum rather large and swollen, making the end of the 

 abdomen subterminally enlarged. Tenth segment shorter than in the 

 other species described. Cerci long, blade-like, slightly constricted 

 at the middle, tapering distally. Ninth sternum similar to that of T. 

 uncincta but the median semi-chitinous point much larger. 

 Tipula sulphurea Doane. 



Externally very similar to T. angiisfi/^ennis, the principal differ- 

 ence being in the shorter eighth segment and in the wider ninth ter- 

 gum. The eighth tergum is even a little shorter than the ninth. 

 Tenth tergum lacks the transverse wrinkles. Ninth sternum a simple 

 narrow U-shaped bar with the closed end posterior and produced into 

 a short slender bar. 

 Tipula dorsolineata Doane. 



Externally almost identical with T. angustipennis. The tenth 

 tergum, however, has no transverse wrinkles, and the ninth sternum is 



