132 PROCEEDINGS OF THE NATIONAL MUSEUM vol. m 



Eurelinae of uncertain generic position 



Eurelus mulaiki Chamberlin, 1943b, p. 147, figs. 7-11. 



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

 Glencoe, Lincoln County, New Mexico, collected on May 31, 1941, 

 by Stanley and Dorothea Mulaik. 



Discussion: The drawings of the gonopods of this form are ex- 

 tremely diagrammatic and show little of specific importance; nor is 

 it possible to determine to what genus the species should be referred. 

 Possibly the closest relationships are with the species of Comanchelus, 

 as suggested by the normal tarsal claws and small coxal lobes. Un- 

 fortunately, we have been unable to secure material for study. 



Range: The species, having been reported in the original description 

 from several localities in Lincoln and Torrance Counties, apparently 

 enjoys a wide distribution in central New Mexico. 



Atopetholinae, new subfamily 



Species of this group are small- to moderate-sized atopetholids, 

 averaging slightly smaller than the species of Eurelinae, which they 

 superficially resemble. Owing to the scarcity of material and to the 

 shortcomings of published descriptions, no satisfactory account of 

 external structure can be essayed beyond an account of details in 

 Atopetholus angelus, a member of the type genus. The antennae tend 

 to be of considerable length, extending back to the second segment, 

 and are therefore much longer than in the Eurelinae. In Atopetholus 

 the collum is evenly acuminate toward the lateral ends, which in 

 Watichelus, however, are bent somewhat caudoventrad. The body 

 segments are smooth and polished, the ozopore opening in the meso- 

 zonites, and in Atopetholus, at least, the suture between prozonite 

 and mesozonite is very poorly defined or invisible. 



In the male, the claws of the anterior legs are not reduced in size, 

 and the coxae are provided only with modest, low subtriangular lobes, 

 which increase slightly in size from the third to seventh leg pair. 



Male gonopods are rather similar in both of the genera, particularly 

 the anterior pair. The sternite is slightly arched mesially, and is 

 surmounted by a large subtriangular vinculum that widely separates 

 the coxites, but that becomes hyaline and membranous proximally 

 and is not continuously rigid with the sternite. 



The coxites are moderate in size, their mesial corners produced 

 distally as usual but to a lesser extent than normal for the family. 

 The telopodites are large and flattened, the apex being broad and 

 blunt, and in Atopetholus, at least, subtended on the caudal side by 

 an additional acuminate process that projects caudad and slightly 



