CAMPODEA. 133 



Our common American species of Campoclea (C. Americana) 

 lives under stones in damp places. It is yellowish, about a 

 sixth of an inch in length, is very agile in its movements, and 

 would easily be mistaken for a very young Lithobius. A larger 

 species and differing in having longer antennae, has been found 

 by Mr. C..Cooke in Mammoth Cave, and has been described 

 in the "American Naturalist" under the name of Campodea 

 Cookei. Haliclay has remarked that this family bears much 

 resemblance to the Neuropterous larva of Perla (Fig. 155), as 

 previously remarked by Gervais ; and the many points of resem- 

 blance of this family and the Lepismidae to the larval forms of 

 some Neuroptera that are active in the pupa state (the Pseudo- 

 neuroptera of Erichson and other authors) are very striking. 

 Campodea resembles the earliest larval form of Chloeon, as 

 figured by Sir John Lubbock, even to 

 the single jointed tarsus ; and why these 

 two Thysanurous families should be 

 removed from the Neuroptera we are 

 unable, at present, to understand, as to 

 our mind they scarcely diverge from the 

 Neuropterous type more than the Mallo- 

 phaga, or biting lice, from the type of 

 Hemiptera. 



Haliday, remarking on the opinion of 

 Linnaeus and Schrank, who referred 

 Campodea to the old genus Podura, says Fig ' 155< Lan 

 with much truth, "it may be perhaps no unfair inference to 

 draw, that the insect in question is in some measure inter- 

 mediate between both," i. e., Podura and Lepisma. This is 

 seen especially in the mouth-parts which are withdrawn into 

 the head, and become very rudimentary, affording a gradual 

 passage into the mouth-parts of the Poduridae, which we now 

 describe. 



The next group, the Podurelles of Nicolet, and Collembola 

 of Lubbock, are considered by the latter, who has studied them 

 with far more care than any one else, as "less closely allied" to 

 the Lepismidse "than has hitherto been supposed." He says 

 "the presence of tracheae, the structure of the mouth and the 

 abdominal appendage, all indicate a wide distinction between 

 the Lepismidae and the Poduridae. We must, indeed, in my 

 opinion, separate them entirely from one another ; and I would 

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