708 



Charles Paul Alexander 



from the body at this time. The teucral achilt then waits quietly until it 

 gams more strength and color. This condition of the insect is the most 

 dangerous period of its existence, since it is defenseless against all enemies 



The insects are associated in the gravel with ground beetles of the 

 genera Omophron, Sclaizogenius, Dyscliirius, Bembidion, Tachistodes- 

 with click beetles of the genus Cryptohypnus; and with rove beetles of 

 which Paederus, Lathrobium, and Gastrolobium are the commonest forms 

 In addition, numbers of larvae of Tabanidae, Leptidae (Atherix), Eriocera 

 spinosa E. fultonensis, E. dnerea, and Eriovtera armata were found 

 Natural enemies of the pupae and the teneral imagines are the medium- 

 sized black lycosid spiders, which preyed in numbers on the weak 

 uncolored adults. Dozens of these spiders were noticed with individuals 

 of the crane-flies in their grasp. When alarmed they would run rapidly 

 away, but only in exceptional cases would they release their victims A 

 few spiders of other famihes, notably the Attidae, were found with Erio- 

 cerae. Dragon-flies appear to be the most serious enemies of the active 

 adults. Helocordulia uhleri (Selys) has been observed capturing the crane- 

 flies by dartmg back and forth thru the swarms of individuals. 



Cylindrotoma splendens Doane 

 The hfe liistory of the species Cylmdrotoma splendens has been 

 worked out m considerable detail by Dr. A. E. Cameron, from material 

 obtamed near Westhohne, Vancouver Island, British Columbia, in late 



nlr,o^ f^^^«^"^g a^«o^"^<^ is abstracted from Cameron's detailed 



paper (1918) on tins interesting crane-fly: 



The adults first appear on the ^ving about the middle of May. Without food thpv ^^ 



wmMmmmmm 



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