78 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 113 
The collection here studied is based primarily on material gathered 
since 1923 by the late Dr. O. F. Cook and the present writer during 
several visits to Panama and on material found on Barro Colorado 
Island, Panama Canal Zone, in 1955 and 1956 by Carl W. and Marion 
E. Rettenmeyer. A part of this latter material was collected in 
association with army ants and was described in a previous paper 
(1959) and is therefore not under consideration here. Represented 
in the collection are 42 identifiable species, 22 new and several typi- 
fying new genera (these are described and drawn in the following 
pages) and 4 identifiable to genus only. As an aid for future workers in 
making identifications, drawings of diagnostic parts and some addi- 
tional structural notes have been prepared for 10 of the 16 species 
originally described by Dr. Chamberlin. Study of the collection and 
review of the pertinent papers have also resulted in the disclosure of 
several misidentifications and the reduction of some genera and species 
to synonomy. 
Descriptions of new species are based essentially on the holotype 
specimen, but differences exhibited by other specimens, either allo- 
type or paratypes, are mentioned without reference to the specimen. 
Characters of immature specimens have not been included. All 
illustrations of new species are from the holotype specimen. All 
holotype and allotype specimens of new species are deposited in the 
U.S. National Museum, as are specimens of previously described 
species from which illustrations were made for this paper. 
Family Glomeridesmidae 
Genus Glomeridesmus Gervais 
Glomeridesmus Gervais, Ann. Sci. Nat., zool. ser. 3, vol. 2, p. 61, 1844. 
Glomeridesmus latus, new species 
Figure la-c 
Hototryrer: Male, USNM myriapod collection 2655, from Cerro 
Campana, Panama, Mar. 16, 1958, G. B. Fairchild and H. F. Loomis. 
Paratype: Male, same data as holotype, author’s collection. 
Diacnosis: Differing from the closely related G. parvior in the oval 
postantennal pit, close to the socket, and in the broad last segment 
and the segments preceding it having their lower posterior corners 
scarcely produced. 
Description: Length 3.5 to 5 mm., caudal segments but slightly 
narrowed; color in alcohol light brown with no distinct lighter mark- 
ings. Antennae separated by little more than the diameter of one of 
the sockets, slender; joints 4, 5, and 6 very slightly thicker than basal 
