24 c Canadian Arctic Expedition, 1913-18 



EXPLANATION OF PLATE III. 



Fig. 28. Hypupygium of \< i>luot<n<i arcticola; ninth tergite, dorsal aspect. 



L".. A . arcticola; outer pleural appendage. 



30. Ti/>ida hcwitti; the same. 



Ml. T. besselsoides; the same. 



3'J. T.johanseni; ninth tergite, dorsal aspect. 



:;:;. 7\ 'diflava; the same. 



T. dijlai'u; lateral aspect; 9 1. ninth tergite; 9 pi. ninth pleurite; 

 9 s. ninth sternite. 



:;."). Tipula arctica; ninth tergite, dorsal aspect. 



Mt>. T. hewitti; the same. 



F j;. M7. Hypopygium of T. arctica; inner pleural appendage. 



:;s. T. subpolaris; ninth tergite, dorsal aspect. 



3i). T 7 . besselsoides; the same. 



40. Ovipositor of 7\ arctica; female sternal valves. 



41. Hypopygium of T. subarctica; ninth tergite, dorsal apsect. 



42. T. besselsoides; inner pleural appendage. 



43. Ovipositor of T. arctica; dorsal aspect. 



EXPLANATION OF PLATE IV. 



Fig. 44. Larva of Poecilostola, supposition; spiracular disk. 



1."). " Tipula arctica; the same. 



46. Stygeropis, supposition; the same. 



47. " Tipuline No. 2; dorsal aspect of entire larva. 



48. " Tipuline No. 2; spiracular disk. 



49. " Tipuline No. 3; the same. 



EXPLANATION OF PLATE V. 



Fig. 50. Pupa of Tipula arctica; male, lateral aspect. 



51. T. arctica; female, dorsal aspect. 



52. Larva of Tipula arctica* labrum, dorsal aspect. 



53. " T arctica; mentum, ventral aspect. 



54. " Poecilostola, supp.; outer lobe of maxilla. 



55. Poecilostola, ^ supp.; mandible. 



56. Tipula arctica; chsetotaxy of third abdominal tergite; dorsal aspect. 



57. T. arctica; the same, third abdominal sternite; ventral. 



58. Stygeropis, supp.; the same, third abdominal tergite; dorsal. 

 5 ( .). Stygeropis, supp.; the same, third abdominal sternite; ventral. 

 00. Tipuline No. 1; the same, third tergite; dorsal. 



61. Tipuline No. 1; the same, third sternite; ventral. 



62. Tipuline No. 2; the same, third tergite; dorsal. 

 < : >- Tipuline No. 2; the same, third sternite; ventral. 

 64. Tipuline No. 3; the same, third tergite; dorsal. 

 '5. ' Tipuline No. 3; the same, third sternite; ventral. 



EXPLANATION OF PLATE VI. 

 Figs. 1, 2. Female of Tipula arctica Curtis (Photos, by Geo. H. Wilkins) 



