52 The Craspedosomatidae of North America. 



"A single specimen, to exact localit}'- not preserved, but proba- 

 bly from Montgomer}^ Co. (Va.), and, I think, not from a cave. I 

 have conferred on it the name of my friend, Dr. H. C. Wood, Jr., 

 to whom we are indebted for a system of the Myriapoda and the 

 means of stnd3Mng the American species. It differs from the A. 

 csesionnulatuH of his monograph in the rounded dorsum without 

 keel or groove, the 29 instead of 32 segments, and the coloration. 

 The e_ye patches are not in a depression, nor is the labrum deeply 

 emarginate, as Wood describes." 



Cleidogona mexicanus (Humb. etSauss.). 



Craspedosoma mexicanmn Humb. et Sauss. : Eevue et Magasin cle Zoologie, 

 1869, p. 153; Etudessur les Myriapodes (Zoologie du Mexique), j). 59, 

 1872. 



Plate VI, figures 105-109. 



Body cylindrical, smooth ; shilling, slightly attenuate cephalad, strongly so 

 caudad, laterally compressed toward the extremity and terminating in a point. 



Head flattened in front, its lateral and superior parts swollen and jjroject- 

 ing, the vertex forming an arched prominence concave behind. 



Eyes forming a triangular plate behind the antennae. 



Gnathochilarum (see plate). 



First segment narrower than the second, forming a constriction behind the 

 head; anterior border sinuate, the middle projecting and arcuate, correspond- 

 ing to the emargination of the occiput; its lateral lobes sharp and bent down- 

 ward, bearing a small horizontal carina Avhich is continued along the anterior 

 border as a mai'ginal thread-like elevation. 



Subsequent segments gradually larger, truncate below with rounded an- 

 gles; dorsal line extremely fine. Each segment (the i^reanal excepted) carry- 

 ing at half-height a small, pointed tubercle, directed backward, and termin- 

 ated by a long bristle; and besides, on each side, between this line of tubercles 

 and the dorsal line, two other lines of very small piligerous granules, looking 

 sometimes like piligerous points. On the anterior segments the lateral region 

 situated below the line of tubercles is striated. 



Last segment forming a triangular arch, comj)ressed, moderately truncated 

 at the extremity; the truncated border ornamented with small spines (3?). 



Anal valves narrow, compressed, forming a crest which projects as far back- 

 wards as the extremity of the last segment. 



Preanal scale rounded. 



Legs long, slender, completely covered by a fine villosity. 



Color chocolate brown, jialer below, posterior border of segments orna- 

 mented by a gray band ; the small tubercles forming spots of lighter color sur- 

 rounded by a pale ring. Feet and antennae pale. 



Length 22 mm. ; width 2.5 mm. ; number of segments ? 



Habitat : Eastern Cordilleras of Mexico. 



