AMERICAN DIPTERA. 235 



PLATE XVI. 



Fig. 123. Tipuld bella, termiual part of abdomen, lateral view, x 23. 



•' 124. " ■' ventral view of hypopygium with appendages removed. 



'■ 125. " '• central vesicle (c. v.) and penis (p). left view. 



" 126. " " guard of peuis (p. g.) and appendages attached to its base. 



" 127. " ■' apical appendages of left side, outer view. 



" 128. " caloptera, distal half of abdomen, lateral view, x 10. 



■' 129. " '■ ventral view of hypopygium with appendages removed. 



" 130. " ■' dorsal view of hypopygium. 



" 131. " ■■ guard of penis {p. g.) and attached appendages. 



" 132 " tnmcorum, termiual part of abdomen, lateral view, x 10. 



" 133. " fallax, central vesicle (c. v.) and basal part of penis (p.). 



" 134. '■ trimcoriim. apical appendages of left side, outer view. 



'■ 135. '■ fallax, ventral view of hypopygium. 



" 130. ■■ incisa, apical appendages of left side, outer view. 



'• 137. " fallax, apical appendages of left side, outer view. 



" 138. " " distal half of abdomen, lateral view, x 10. 



PLATE XVII. 



Fig. 139. Tipula angiiMipennis, abdomen, lateral view, x 5. 



'■ 140. ■' ■' middle and lower apical appendages, outer view. 



" 141. ■' ■' dorsal view of hypopygium. 



" 142. " " lateral view of hypopygium. 



" 143. ■' " upper apical appendage of left side, outer view. 



" 144. " " central vesicle (o. ■«. ) and peuis {p.), left side. 



" 145. " " guard of penis, dorsal view. 



" 146. " " central vesicle (c. v.) and penis (p.), ventral view. 



" 147. '' " ventral view of hypopygium. 



" 148. '■ '' V-shaped bar in roof of genital chamber lying be- 



tween posterior arms of central vesicle. 

 Fig. 149. Tipula angustipemiis, terminal part of abdomen, lateral view, with left 

 side of eighth and ninth segments removed, x 15; an., anus; a. t., 

 anal tube or tenth segment; c. v., central vesicle; ej. d., ejacula- 

 tory duct; g. c. genital chamber; p., penis; p. g.. guard of penis; 

 r., rectum. 



TRANS. AM. ENT. SOC. XXX. AUGUST. 1904. 



