124 PROCEEDINGS OF THE NATIONAL MUSEUM vol. m 



a generic range along the Sierra Madre Oriental, with additional species 

 probably remaining to be discovered. 



Centrclus falcatus Cook 



Centrdus falcatus Cook, 1911, p. 156. 



Holotype: Male, USNM 800, from Guanajuato, Mexico, probably 

 collected by A. Duges.^ 



Diagnosis: A small species of Centrelus about half the size of C. 

 kerrensis, and with only 3 or 4 lateral spines on each segment instead 

 of 6 to 10 as in that species. 



Description (from cook): Length of male about 38 mm., width 

 about 3.0 mm.; female about 42 mm. by 4.5 mm. 



Clypeal foveolae 4-4; surface of vertex and clypeus smooth; ocellaria 

 oval or trapezoidal, each with about 40 ocelli in 7 or 8 rows. 



Marginal ridge of the collum broad, and the lateral angle rather 

 rounded, not projecting below the second segment as in Eurelus. 

 Second segment with the anterior margin decurved. 



Surface of segments nearly smooth, very finely and indistinctly 

 punctate and longitudinally striate above; lateral and ventral stria- 

 tions very short, confined to the metazonite, surface below each 

 striation smooth. Segments behind middle of the body with the 

 striations well separated, only three or four on each side, and pro- 

 duced into distinct sharp spines curving obliquely upward. 



Last segment smooth, the apex very broadly triangular-rounded, 

 distinctly exceeded by the strongly convex, smooth, anal valves. 

 Preanal scale very broadly rounded. 



Centrelus kerrensis (Clianiberlin and IMiilaik), new combination 



Figures 3, 5 

 Eurehis kerrensis Chamberlin and Mulaik, 1941, p. 61. — Chamberlin and Hoffman, 



1958, p. 156. 

 Toltecolus garcianus Chamberlin, 1943a, p. 27 (male holotype from Garcia, Nuevo 

 Le6n, Mexico, in the collection of R. V. Chamberlin, collected by C. Bolivar 

 and F. Bonet, July 14, 1942.) 

 Holotype: Male, collection of R. V. Chamberlin, from Raven 

 Ranch, Kerr County, Texas; collected in July 1939 by Stanley and 

 Dorothea Midaik. 



Diagnosis: A moderate to large sized eureline characterized by the 

 number of segments (50-53) and ocelli (35-45), differing from C. 

 ■falcatus as well as other eurelines in having as many as 8 to 10 stout 

 marginal spines on the lower sides of the metazonites. 



Description (male from Real County, Texas): Body 65.0 mm. 

 long and 6.5 mm. in diameter, with 51 segments. 



« This specimen was misplaced by Cook In the main body of the Museum's diplopod collection, and 

 has not yet been recovered for segregation In the type series. 



