LIFE-HISTORY OF THE LEAF-EATING CRANE-FLY. 



Cylindrotoma splendens, Doane. 



Alfred E. Cameron, M. A., D. Sc, F. E. S., 

 Entomological Branch, Department of Agriculture, Ottawa, Canada. 



CONTENTS. 



Page 



Introduction 67 



Present knowledge of the Cylindrotomini 69 



Life-history and habits 70 



Copulation, Oviposition, Duration of Egg-stage, The Embryo and 



Emergence of Larva, Larval Habits, Pupation, Duration of Pupal Period, 



Emergence of Adult. 



Proportion of Sexes 79 



Description 81 



Egg, Full-grown Larva, Head-capsule of Larva and Mouth-parts, Pupa, 



Adult, Hypopygium. 

 Summary 89 



INTRODUCTION. 



On April 28, 1917, whilst on a journey undertaken with a 

 view to determining the distribution of the Pear Thrips, Taenio- 

 thrips incoitsequens Uzel on Vancouver Island, the author had 

 the good fortune to discover a curious, Tipulid larva quite 

 unknown to him. The locality of the discovery was in the rural 

 district of Westholme about 40 miles north of the town of 

 Victoria. His attention was first drawn to the insect by his 

 co-worker, Mr. E. W. White, Assistant Horticulturist of the 

 Department of Agriculture, British Columbia, whose interest 

 was first aroused by the feeding activities of the larva. In a 

 rich woodland timbered by lofty cedars and spreading, large- 

 leaved maples, there was growing in great luxuriance the false 

 bugbane, Trautvetteria grandis, which affects damp and well- 

 shaded habitats. It was on the leaves of this perennial, ranun- 

 culaceous herb that the larvae in question were feeding in large 

 numbers, eating out large, irregular holes. The insect was suc- 

 cessfully reared, and the adults submitted to Mr. Chas. P. 

 Alexander, Department of Entomology, Cornell University, 

 who identified the species as Cyli?idrotoma splendens, Doane, in 

 a letter dated May 25, 1917. In reply to a letter of the author, 

 in which the finding of the larvae was mentioned and their gen- 

 eral appearance outlined, Mr. J. R. Malloch, of the Illinois 

 State Labpratory of Natural History, Urbana, Illinois, under 



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