24 PROCEEDINGS OF THE NATIONAL MUSEUM VOL, 118 
largely bridged the gaps between the genera or at least compelled their 
redefinition on the basis of characters other than those originally em- 
ployed. The groups of species currently going under the names 
Apheloria, Dixioria, Sigiria, Sigmoria, and Cleptoria are at present 
inseparable except on the basis of gonopod structure, and some com- 
bination is doubtless to be expected as a result of future critical studies. 
In most respects Deléotaria is very similar to the genera mentioned 
but differs in two important respects—the lack of cranial setae and 
the development of coxal apophyses on the gonopods. Both of these 
features are probably specializations, and on the basis of other char- 
acters I judge the relationship to be largely with the species of Sigiria, 
which occur in the same general region. The similarity of the gono- 
pods of Deltotaria tela to those of Sigiria rubromarginata is noteworthy, 
and the color pattern is virtually identical in all the species of both 
genera. 
Within the confines of generic limits, the species of Deliotaria show 
considerable individuality in specific expression. It is difficult to 
postulate which characters are specialized and thereby to achieve an 
insight into evolutionary tendencies, but my inclination is to regard 
the simple falcate gonopod form and the least convex body shape as 
in the nature of generalized features. The species of Deltotaria so 
characterized both occur in the Piedmont region on the periphery of 
the generic range (perhaps in a sort of relict status). The species (or 
subspecies) brimleii, mariana, and brimleardia represent the other 
extreme and are centrally located in the high ranges of the Blue Ridge 
(see fig. 4). 
The last three forms named constitute an interesting problem in their 
own right. Obviously closely related, they are also apparently 
sympatric and I anticipate that future collections may show them to 
be geographic races of one species. Uncertainty about the gonopod 
structure of brimlew (the genitalia being lost from the holotype) is 
perhaps the major reason that mariana is proposed here as a full 
species rather than as a subspecies of brimleardia. 
Only one of the six forms of Deltotaria is known from more than one 
locality. This form, mariana, has been collected from three places 
over a range of some 30 miles, and all of the material is virtually 
identical; thus mariana differs consistently from the type specimen of 
brimleardia, which was taken about 40 miles west of the mariana 
localities. The specific characters employed to separate the two, 
while not outstanding, do appear to be constant and allow identifica- 
tions to be made with some degree of confidence. 
