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An account of the Arachnides of the United States. 

 By Thomas Say. 

 The following descriptions of the Arachnides of 

 this country, which respire by means of trachea in 

 the manner of insects, may be regarded as the con- 

 tinuation of a series of essays, of which the " account 

 of the Crustacea/' &c. is the first, on the vast orders 

 of articulated animals ivith articulated feet, (Annu- 

 losa of.Cuvier) natives of this country. As the na- 

 ture of the journal precludes the introduction of old 

 matter or known facts, I shall confine myself in its 

 pages, to the description of such of these animals 

 only, as appear to be unknown to naturalists, or to 

 the elucidation of such, as from their obscurity, are 

 not understood. 



subclass I CEPHALOSTOMATA. 



order 1st, PODGSOMATA. 



genus *ANAPHIA.f 



PI. 5. fig. 7.— a Trophi. 



Artificial Character. — Mandibles longer than the 

 rostrum, first joint longer than the second; palpi 

 none ; nails single. 



Natural Character. — Body very slender, com- 

 posed of four segments bearing feet, and a small sub*- 

 oval caudal process ; head prominent, not percep- 

 tibly contracted behind, and consisting of a prolonga- 

 tion of the anterior segment of the body ; eyes four, 



t From «, without, and «<p», tactus the touch. 



