116 PROCEEDINGS OF THE NATIONAL MUSEUM tol. m 



Key to the subfamilies of Atopetholidae 



1. Ozopores opening in the metazonite. Posterior gonopods with distinct 



solenomerite of varying size and shape. Coxites of anterior gonopods 

 with well-defined oblique grooves setting off the lateral surface 



Arinolinae (p. 147) 

 Ozopores opening in the mesozonite. Posterior gonopods without soleno- 

 merite or seminal groove. Coxites of anterior gonopods entire, without 

 oblique grooves 2 



2. Sternite of anterior gonopods strongly arched mesially, the suprasternal 



membrane sclerotized and fused with it to form a flat subtriangular pseudo- 

 sternite; sternal apodemes of anterior gonopods curved inward distally, 

 those of posterior gonopods greatly expanded at the end. Legs with 

 numerous long bristles on the sides in addition to the normal short ventral 



setae Onychelinae (p. 147) 



Sternite of anterior gonopod transverse or moderately arched; intersegmental 

 membrane sclerotized an as intercoxal vinculum of various shape but 

 never as a flat triangular plate fused with the sternite. Legs without long 

 lateral setae. Apodemes of posterior gonopod not strongly expanded 

 distally 3 



3. Segments with one distinct transverse suture. Vinculum broad and heavily 



sclerotized with a median groove or depression extending caudad between 

 the coxae and more or less in contact with the sternite 



Atopetholinae (p. 132) 

 Segments with two distinct transverse sutures. Vinculum small and separated 

 from the sternite by a large expanse of thin connective tissue 



Eurelinae (p. 117) 



Eurelinae, new subfamily 



The atopetholids assigned to this distinct and homogeneous sub- 

 family are all fairly large in size and include the largest Icnown repre- 

 sentatives of the family. In general form the species tend to be robust 

 and heavy-set, abruptly tapering at both ends of the body, and with 

 the head and colunm distinctly smaller than the second and suc- 

 ceeding segments. The ocellaria are well-developed, each with 30 

 to 50 or more ocelli. Normally the pleurotergites are smooth and 

 without distinct punctations. The color in life appears to be, usually, 

 some uniform shade of gray or olivaceous; in preservation the seg- 

 ments may develop annulations of darker color. There is consider- 

 able variation in secondary sexual characters of the males: Coxal 

 lobes and claws of the anterior legs may be absent, normal, or hyper- 

 trophied, the variation in general tending to reflect specific rather 

 than generic differentiation. The gonopods are basically similar, 

 and are characterized by the considerable amount of sclerotized 

 membrane between the true sternite and the coxae. There is a 

 more heavily sclerotized midpiece, the vinculum, occupying a rather 

 isolated position between the coxites, and presumably serves as a 



