INSECTS OF THE CAVE. 



15 



of Harvest men is represented by a small white form, described by 

 Tellkampf under the name of Plialangodes armata (Fig. 129) but 

 now called Acanthocheir armata Lucas. The body alone is but half 

 a line long, the legs measuring two lines. It should be borne in 

 mind that many of the spiders, as well as the Thysanura, live in 

 holes and dark places, so that we would naturally find them in 

 caves. So, also, with the Myriopods, of which a most remarkable 



form* (Figs. 130, and 130 a 

 front of head) was found by 

 Mr. Cooke, three or four miles 

 from the mouth of the cave. It 

 is the only truly hairy species 

 known, an approach to it being 

 found in Pseudotremia Vudii 

 Cope. It is blind, the other spe- 

 cies of this group which Profes- 

 sor Cope found living in caves 

 having eyes. The long hairs ar- 

 AnthroUa monmouthia. ranged along the back, seem to 



suggest that they are tactile organs, and of more use to the Thous- 

 and legs in making its way about the nooks and crannies of a per- 

 petually dark cave than eyes would be. It was found by Mr. 

 Cooke under a stone. 



Prof. Cope has contributed to the " Proceedings of the American 

 Philosophical Society" (1869, p. 171) an interesting account of the 



* Spirostrephon (Pseudotremia') Copei n. sp. Head with rather short, dense hairs; no 

 eyes, and no ocular depression behind the antennae, the surface of the epicranium being 

 well rounded to the antennal sockets; behind the insertion of the antennas the sides of 

 the head are much more swollen than in S. lactarius. Antennae slender, with short 

 thick hairs ; relative length of joints, the 6th being longest ; 6th, 4th, 5th, 3d, 8th, 7th, 1st, 

 the 7th joint being much thicker than the 8th. Twenty-eight segments besides the head ; 

 they are entirely smooth, striated neither longitudinally nor transversely; a few of the 

 anterior segments rapidly decrease in diameter towards the head. The segments are 

 but slightly convex, and on each side is a shoulder, bearing three tubercles in a trans- 

 verse row, each giving rise to a long stiff hair one-half to two-thirds as long as the seg- 

 ment is thick; these hairs stand up thickly all over the back, and may serve at once to 

 distinguish the species. No pores. Feet long and slender, nearly as long as the an- 

 tennae, being very slender towards the claws. Entirely white. Length of body .35 

 inch ; thickness .04 inch. 



It is nearly allied to Pseudotremia Vudii of Cope. It will be noticed that Professor 

 Cope characterizes the genus Spirostrephon as having " no pores "; though we find it 

 difficult to reconcile this statement with that of Wood who describes S. lactarius as 

 having " lateral pores." Cope separates Pseudotremia from Spirostrephon for the rea- 

 son that the segments have "two pores on each side the median line." The present 

 species has no pores, but seems in other characters to be a true Spirostrephon, and we 

 are thus led to doubt whether Pseudotremia is a well founded genus. 



