AMERICAN DIPTERA. 211 



shaped brace, but in this species it is bent into five sides of a hexa- 

 gon (fig. 152). The open side is posterior. All of the sides are 

 angulated in a dorso-ventral direction, so that the figure is not very 

 regular in side view (fig. 150, br.). The penis is short and thick. 

 It extends in a curve ventrally and posteriorly from the central vesi- 

 cle (fig. 150, p.). Subterminally it is thickened and soft. It ends 

 in a tapering point. The guard of the penis (fig. 151) consists of 

 two high vertical plates set close together and united by membrane 

 along their lower edges. Each is partially divided lengthwise into 

 an upper and a lower half. The former projects posteriorly with a 

 free blunt point (fig. 151), while the latter has a decurved terminal 

 part ending in a small hook. 



The tenth segment consists of a large, conspicuous, trihedral, anal 

 tube projecting posteriorly between the apical appendages. 



Tipula incisa Doaue (PL XVI, fig. 136). 



The eighth sternum is large and is produced beneath the hypopy- 

 gium. Its posterior border is provided with a wide brush of hairs. 



The hypopygium has the typical form, consisting of tergum, pleura 

 and sternal plates, separated below by membrane, except anteriorly, 

 where they are united by a chitinous bar. 



The apical appendages (fig. 136) are three in number. The first 

 (A) is a slender, delicate, sinuous rod. The second (B) is large, 

 quadrate, and born on a thick peduncle. The third (C) is attached 

 basally to the second. It is a wide plate of about uniform width. 



Tipula truncornm Meigen (Pf. XVI, figs. 132, 134). 



The eighth sternum is somewhat enlarged and prolonged beneath 

 the hypopygium. Its posterior margin bears a wide median brush 

 of hairs covering the membranous area of the ninth sternum. 



The hypopygium is somewhat elongate (fig. 132). The tergum is 

 notched mesially, produced into a small point on each side. The 

 sternum has the typical form, being composed of two lateral plates, 

 separated by a membranous area below, except in front, where they 

 are connected by a narrow chitinous bar. The posterior margin is 

 notched. At each side of the notch is attached a small transverse 

 lobe. The pleura are small, but are entirely separate from the ster- 

 num (fig. 132). 



The apical appendages (fig. 134) are three in number. The first 



TKANS. AM. ENT. SOC. XXX. JULY. 1904. 



