AMERICAN 1MPTERA. 225 



process. A dorsal groove extending along this process and the body 

 of the guard lodges the tip of the penis. 

 Tipula carinata Doane (PI. XII, figs. 70, 71). 



The tergura and sternum of the hypopygiura are almost fused, the 

 suture on each side being marked only by a faint, pale line. The 

 sternum is widely and deeply notched below, but the anterior bridge 

 of chitin is comparatively wide (fig. 70). The notch in the chitin 

 is occupied by a membrane which forms also the posterior margin 

 of the sternum. This membrane has a small median emargination 

 on whose edges are two elongate chitinous plates. 



There are only two apical appendages on each side (fig. 71). The 

 first (A) is a slender slightly clavate lobe. The second (B) is 

 thicker, bent forward, and has a flat, oblique distal end. A small 

 lobe (C) on the outer edge of its base might be a rudimentary third 

 appendage. 



The guard of the penis is a slender tapering decurved structure, 

 grooved above, and bearing two small points projecting downward 

 and posteriorly from the base. 



Tipula flavicans Fab (PI. XIV, fig. 108). 



The eighth segment is simple, its sternum is but little produced 

 beneath the hypopygium. The abdomen gradually thickens poste- 

 riorly from the fifth segment. 



The hypopygium is large and its walls are circularly continuous, 

 there being no division into tergum, sternum or pleura, and the ster- 

 num is undivided below. The tergum is about twice as long as the 

 lateral sternal and pleural parts. Its posterior border presents a 

 rounded concavity above. The posterior, free, lateral margins are 

 produced caudally as two large rounded lobes with serrated margins ; 

 each is very convex outwardly and concave inwardly (fig. 108, a). 

 From the posterior border of the sternum there projects caudally a 

 wide, flat, semi chitinous, median lobe (fig. 108, b) with a small 

 rounded crest like elevation proximally on its upper side. 



There are three apical appendages. The first (fig. 108, A) is 

 small and spatulate. The second (B) arises just posterior to the 

 first. It is wide and strongly curved forward. The third (C) is 

 situated considerably below the others, and is double, consisting of 

 an outer and an inner lobe. Both are curved dorsally and forward, 

 the outer is slender and cylindrical, the inner wide and flattened. 



TRANS. AM. BNT. SOC. XXX. (29) JULY. 1904. 



