ATOPETHOLID MILLIPEDS — HOFFMAI^J AND ORCUTT 



117 



spacer to maintain rigidity of form in lieu of the sternite, which 

 usually assumes this function in spiroboloids. 



The distribution of the Eurelinae (fig. 3) is distinctly Texan — all 

 the three known genera and three of the six species occurring in this 

 State. The others are recorded from the Mexican States of Chihua- 

 hua, Nuevo Le6n, and Guanajuato — all on the eastern side of the 

 Mexican Plateau. One species, Eurelus mulaiki from New Mexico, 

 is unknown to us. From the drawings of its gonopods, as well as the 

 disjunct distribution, it seems possible that mulaiki may represent 

 another generic type within the limits of this subfamily. Those of 

 which we have examined material may be distinguished by the 

 characters selected for the following key : 



A 



7. 



y. 



/ 



^ 



( 



\ 



\ 



^ 



Figure 3. — Map showing the known localities for three species of the Eurelinae in Texas 

 and Nuevo Leon: A Comanchelus hubrichti; Q) Centrelus kerrensis; V Eurdus soleatus. 

 The broken line approximates the 1,000-foot contour, which apparently separates the 

 ranges of soleatus and kerrensis. 



