204 R. E. SNODGRASS. 



The hypopygium is cup shaped, the rim of the genital chamber 

 faces posteriorly and upward. The tergum bears a small, median, 

 quadrate lobe on the posterior margin with the angles produced out- 

 ward as two small horn-like processes. The sternum is continuous 

 across the median line. On each ventro lateral aspect a suture runs 

 forward from the posterior margin half way to the anterior. This 

 is evidently the same suture that in Pachyrrhina marks the ventral 

 margin of the pleurum, and is the one we will call in Tipula the 

 pleural suture. The plate partially separated off above it always 

 carries the apical appendages. 



There are two apical appendages on each side. The first (figs. 64 

 and 65, A) is long, slender and curved. The second (B) is large, 

 wide and flat. The distal half is curved forward. The basal half 

 is quadrate and bears a tapering lobe on each distal angle. 



The central vesicle and penis are of ordinary form. The latter 

 curves through the eighth segment. The guard is a simple stylet- 

 like structure deeply grooved above. Two small strap like processes 

 project downward from its base at the posterior edge of the ninth 

 sternum. 



Tipula brevicollis (PI. Xll, fig. 69). 



The pleural suture is present and bends slightly upward at its 

 anterior end. The sternum is widely continuous across the median 

 line, but is deeply emarginate posteriorly. 



Tipula tricolor Fab. (PL XV, figs. 119, 121). 



The eighth segment is normal and does not project specially be- 

 neath the hypopygium. 



The hypopygium itself has a rather simple appearance and forms 

 scarcely an enlargement of the abdomen (fig. 119). The tergum is 

 small, and its posterior margin is graduated. The lateral parts of 

 the sternum are attingent below, but are separated by a membranous 

 suture. The only connection is a semi circular chitinous bar con- 

 tinuous from the anterior margin of one side to that of the other. A 

 rather long longitudinal pleural suture on each side marks the lower 

 edge of the pleural region, but otherwise the pleurum is not separa- 

 ted from the lateral part of the sternum. The part of the sternum 

 below this suture forms a partially free lobe. 



The apical appendages are very large and of regular outline form- 

 ing an even outline posteriorly (fig. 119). The first appendage (fig. 

 121, A) is a very large, flattened, irregularly quadrate plate almost 



