ATOPETHOLID MILLIPEDS — HOFFMAN AND ORCUTT 119 



and T. chihuanus — both now placed in other genera — and the 

 description of soleatus overlooked entirely. 



At the beginning of the present study, therefore, four names had 

 been proposed in Eurelus, and still another had been set up in a related 

 genus although actually based upon soleatus. On the basis of all 

 available information, we propose to consider Eurelus as monotypic, 

 considering two of the later names as junior synonyms of soleatus 

 and transfering another to Centrelus. The remaining name, mulaiki, 

 is almost surely not congeneric with soleatus. 



Eurelus soleatus Cook 



Figures 1, 3, 4 



Eurelus soleatus Cook, 1911, p. 153. 



Eurelus proximus Chamberlin and Mulaik, 1941, p. 62 (male holotype from Edin- 



burg, Texas, in the collection of R. V. Chamberlin, collected by Stanley 



Mulaik, 1938). 

 Toltecolus parviinguis Hoffman, 1949, p. 1, figs, a, b (male holotype from Frio 



County, Texas, USNM 1853, collected by G. E. Ball, April 8, 1948). 



Holotype: Male, USNM 801, from Falfurrias, Brooks County, 

 Texas, collected in August 1906, by O. F. Cook.* 



Diagnosis: A large smooth-bodied atopetholid, 60 to 70 mm. in 

 length and up to 8.0 mm. in diameter, with 46 to 49 segments. 40 

 to 50 ocelli in each rounded ocellarium. Tarsal claws of fourth-seventh 

 legs of male greatly reduced ; coxal lobes of third legs (fig. id) elongated 

 and produced caudad, notched about their midlength and embraced 

 by coxal lobes of fourth leg pair. Stemite of male gonopods distinctly 

 arched medially, separated. from the coxites by a considerable area 

 of thin sclerotized membrane. Apices of coxites conically acute, finely 

 punctate. Posterior gonopods robust, telopodite produced distally 

 into a short truncate lobe and an opposed laminate terminally 

 expanded process. 



Description: The very detailed description published by Cook 

 cannot be improved upon except with respect to the genitalia, which 

 are now illustrated in detail for the first time. 



From the anterior aspect, the anterior gonopods are dominated by 

 the laterally arched coxites, which contact the stemite only slightly 

 at its lateral ends. Mesially the coxites are separated by the inter- 

 calary vinculum, formed by thickening and sclerotization of the 

 connective tissue between them and the stemite. The sternite is 

 distinct and subtransverse, but narrower and somewhat arched near 

 the median line. Laterally the sternite becomes broader and gives 



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

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



