126 American Midland Naturalist Monograph No. 1 



Chelicerae. — Very large and long, with very effective digits. 

 Folds. — Coxal and supracoxal folds present. 



Grooves. — Transverse postanal groove short and deep; all others absent or 

 indefinite. 



Spiracle. — A flattened, globular protuberance, free on all sides except on 

 the attached smaller end. 



Sexual opening. — Between coxae I. 



Anus. — Large, in an elliptical frame placed well 'back on the venter. 



nymph 



With the specimens before us it is evident that the nymphs differ from the 

 adults only in their smaller size, absence of sex openings, and in having the 

 marginal tubercles longer. 



Male unknown. 



HOST AND DISTRIBUTION 



The type specimens were from a cave in Guanajay Mountains in Cuba; 

 "also from a West Indian bat probably from Porto Rico." (Banks, 1910.) 



Vigueras (1934) stated that Eumops glaucinus (Wagner) is a host and 

 reported the collection of two females from bats, Nycticeius cubanus (Gund- 

 lach), captured in Santiago de las Vegas. 



It is evident that this species is closely related to coprophilus (Mcintosh) 

 but the two are readily separated by the characters mentioned in the key to 

 species. The original collection has been divided, part being in the National 

 Museum and part in the collections of the Bureau of Animal Industry, U. S. 

 Department of Agriculture, and neither lot contained a type label. The senior 

 author has seen all of the specimens. One female from these has been placed 

 in the collections of the Rocky Mountain Laboratory, Hamilton, Montana. 

 The combined lot contains 2 females and 18 nymphs of various sizes. Having 

 available only one sex, we cannot determine at present whether the sexes are 

 dissimilar in this species. In the relatively few specimens available and in view 

 of their relatively small size it was not possible to determine whether the even- 

 tual sex would be indicated in late stage nymphs. 



In the lot now in the collections of the Bureau of Animal Industry there 

 is one small, probably a first stage, nymph which differs in having the tubercles 

 on the margin smaller in diameter and relatively much longer than in the 

 larger nymphs. It is possible either that A. marginatus makes this remarkable 

 change during its development, or that it represents an early stage of an 

 undescribed species. 



The single female in the lot in the National Museum was separated and 

 labelled as the lectotype of the species. 



