THE SMOKY CRANE-FLY. 131 



potatoes, and such crops, or to leave it fallow the ensuing summer. 

 Pastures and hay fields in localities where this species is known to be 

 abundant should be grazed off by the middle of September and kept 

 so until late in November, as the adult flies usually congregate in rank 

 growths of grass, clover, weeds, etc., and there lay their eggs. 



LARViE OF CRANE-FLIES AS ACCIDENTAL INHABITANTS OF MAN. 



While we have no knowledge that any of our American Tipulida? 

 directly affect man, in a contribution to The British Medical Jour- 

 nal of February 12, 1910, No. 2563, page 371, Dr. W. Soltau Fen- 

 wick, in a contribution under the head of " The existence of living 

 creatures in the stomach as a cause of chronic dyspepsia," cites two 

 instances, as follows: "In two apparently authentic cases (Lasalle. 

 Sentex) larva? belonging to the family of Tipulidse or crane-flies 

 were detected in the vomit and faeces. Of this, the best-known 

 species is the Tipula longicornis, or daddy-long-legs, which deposits 

 its eggs on the ground, whence they possibly gain access to the human 

 stomach by means of unwashed vegetables and fruit. The grubs, 

 which are tough-skinned and hard-headed, are well known to gard- 

 eners by the name of leather jackets." 



