98 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 118 
shown in Silvestri’s figure 4, but with the crossed terminal branches 
more slender. Dissection just made of a gonopod of a male P. cre- 
scentis (fig. 4a) collected between Arcadia and Okeechobee, Florida, now 
shows the genus to be distinct from Poratia. Furthermore, Chamber- 
lin’s Dominicodesmus and Tidopterus, once placed assynonyms of Psocho- 
desmus now are seen to be synonyms of Poratia on the basis of their 
gonopods. Reappraisal of the description of Xerodesmus Chamberlin 
(Occas. Pap. California Acad. Sci., vol. 12, p. 403, figs. 36-38, 1923), 
which I once placed as a synonym of Psochodesmus, now leads me to 
consider it a valid genus insofar as Psochodesmus or Poratia are con- 
cerned. Chamberlin’s name, however, was preoccupied by Xerodes- 
mus Cook (Brandtia, fase. 1, p. 2, 1896), and Attems (Das Tierreich, 
Lief 70, p. 322, 1940), has replaced it with Kapyrodesmus. 
Poratia digitata (Porat) 
Scytonotus digitatus Porat, Ent. Tidskr., vol. 10, p. 35, 1889. 
Poratia digitata Cook and Cook, Ann. New York Acad. Sci., vol. 8, p. 238, 1894. 
Poratia heterotuberculata Carl, Rev. Suisse Zool., vol. 10, p. 267, pl. 11, fig. 99, 1902. 
Dominicodesmus panamicus Chamberlin, Bull. Univ. Utah, vol. 30, No. 9, p. 6, 
1940. 
Numerous specimens from Canal Zone, Monte Lirio, June 8, 
1923, and Gamboa, Apr. 19, 1925, O. F. Cook; Frijoles, July 13, 1923, 
H. F. Loomis 
Poratia granulofrons (Chamberlin) 
Treseolobus granulofrons Chamberlin, Bull. Mus. Comp. Zool., vol. 62, p. 221, 
1918. 
Dominicodesmus geophilus Chamberlin, Proc. Biol. Soc. Washington, vol. 36, p. 
189, 1923. 
Psochodesmus granulofrons Loomis, Smiths. Mise. Coll., vol. 89, No. 14, p. 54, 
1934. 
Canal Zone, 2 females, Barro Colorado Island, March 8-15, 1958, 
EK. M. and H. F. Loomis; 2 females, Pifa area, March 18, 1958, 
H. F. Loomis. 
Panama, 2 females, Taboga Island, July 15, 1923, O. F. Cook and 
H. F. Loomis. 
Tracheloaspis, new genus 
Type species: Tracheloaspis tumida, new species, by present 
designation and monotypy. 
Diagnosis: Possibly related to Gasatomus Chamberlin, of which 
males still are unknown, but with stouter body; shorter, broader 
first segment having more extensive front margin and slightly cre- 
nulate back margin; keels of segments 6 to 19, four lobed, those of 
segments 17 to 19 strongly produced caudally. 
