No. 453.] DISTRIBUTION OF CICINDELA. 



Owens Lake and Mono Lake, and found Cicindela echo or C. 

 psemioscnilis at all but three — namely, Utah, Mono and 

 Walker. I cannot definitely assert that the species, in some of 

 its forms, is absent from all of these three, but we have no evi- 

 dence to show that it occurs there. Mono Lake may perhaps 

 lie at too great an altitude for the insect to flourish, or it may 

 never have been introduced into the district. It is possible that 

 a more extended search may yet disclose some form of it there, 

 my visit having been a hurried one and productive of no Cicin- 

 dela whatever, though C. pscitdosoiilis and C. hcEnwrr/iagica 

 must have been flying in abundance at Owens Lake, distant 

 about a hundred miles. Walker Lake has been twice visited by 

 me with the special object of looking for some form of C. echo, 

 but I took only C. hcemorrhagica and a variety of C. oregona, 

 both in plenty. I hope that if any entomologist has the oppor- 

 tunity, he will visit the fiats at the upper end of the lake, in 

 the vicinity of the mouth of the river, since I have noticed that 

 the colonies are sometimes confined to a limited area and may 

 easily be missed. It will be well also to examine the neighbor- 

 hood of the large spring said to exist near Wabuska ; it dates 

 back to considerable antiquity and may yield something inter- 

 esting. Utah Lake has been visited by several entomologists at 

 different times, and it seems that if C. echo occurs there it 

 should have been met with before this. 



These three lakes which have failed to yield material after 

 exploration ma> be left out of the rest of the discussion. Of 

 those which have been productive, Owens Lake has been dis- 

 tinct for a vast period, having, as we ha\ c seen, been se]»arate 

 even during the greatest extension of the nther>. (.real Salt 

 Lake was a part of Bonneville, while Humb.^ldt Lake and 

 Honey Lake lie in the ancient bed of Lahontan. The small 

 bodies of water in Wyoming, which harbor C . willistoni were of 

 course not included in either and had no communication there- 

 Looking again at the beetles, we find : 



(a) The Owens Lake form, which has probably been isolated 

 since (at least) early Pleistocene times, is sufficiently well differ- 

 entiated to have been separated by systematists as a distmct 

 species, though this view is no longer held. 



