INSECTS OF THE CAVE. 



Fig. 127. 



kampfs figure indicates, it is the same species apparently, as I 

 have received numerous specimens of this widely distributed form 

 from Knoxville, Tennessee, collected by Dr. Josiah Curtis. 



It was regarded as a crustacean by Tellkampf, and described 

 under the name of Triura cavernicola.* He mistook the labial 

 and maxillary palpi for feet and regarded 

 the nine pairs of abdominal spines as feet. 

 The allied species, M. variabilis Say, is 

 figured in vol. v. pi. 1, fig. 8, 9 (see also 

 p. 94 of vol. v of the NATURALIST). 



An interesting species of Campodeaf of 

 which the accompanying cut (Fig. 127) is 

 a tolerable likeness, though designed to il- 

 lustrate another species (C. stapliylinus 

 Westw.) was discovered by Mr. Cooke. 

 Both the European and our common spe- 

 cies live under stones in damp places, and 

 the occurrence of this form in the water is 

 quite remarkable. The other species are 

 blind, and I could detect no eyes in the 

 Mammoth Cave specimen. 



A small spider was captured b} r Mr. 

 Cooke, but afterwards lost ; it was brown 

 in color, and possibly distinct from the 

 Anthrobia monmouthia Tellkf. (Fig. 128) which is an eyeless form, 

 white and very small, being but half a line in length. The family 



*-Professor Agassiz in his brief notice of the Mammoth Cave animals, does not criti- 

 cise Tellkampf s reference of this animal to the Crustacea; and so eminent an authority 

 upon the articulates as Schiodte remarks that while " Dr. Tellkampf's account affords 

 us no means of forming any conclusion as to its proximate relations," that, hoAvever, 

 it " appears to belong to the order of Amphipoda, and to have a most remarkable 

 structure." TellkampPs figure of Machilis is entirely wrong in representing the labial 

 and maxillary palpi as ending in claws, thus giving the creature a crustacean aspect ; 

 and ndeed he describes them as true feet ! 



t Campod^a Cookei n. sp. Closely allied to C. Americana, but it is much larger; the an- 

 tennae are 24-jointed instead of 20-jointed as in C, Americana, and reach to the basal 

 abdominal segment, while in C. Americana they reach only to the second thoracic; the 

 terminal joints are much longer than in that species, the penultimate joint being one- 

 third longer. Last three abdominal segments unequal (equal in C. Americana) the penul- 

 timate very short, not half as long as the terminal, which is longer and slenderer than in 

 C. Americana, while the three are much narrower in proportion to the rest of the body 

 than in the other species. Hind femora longer than in C. Americana. Entirely white 

 and pilose. Length .25 inch, the largest C. Americana being .15 to .20 inch. (Anal sty- 

 lets broken off.) Several specimens were seen by Mr. C. Cooke, but only one was cap- 

 tured in a pool of water, two or three inches deep, in company with the C- cidotea. 



Campodea. 



