﻿240 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 102 



ther serves to emphasize the lack of any close affinity between the two 

 groups. 



Genus PROTAPHELIDESMUS Brolemann 



Protaphelidesmus Beolemann, Ann. Soc. Ent. France, vol. 84, p. 559, 1916. 

 (Genotype: Platyrrhacus ligula Brolemann.) 



Range. — Venezuela. 



Species. — Protaphelidesmus ligula Brolemann, levigatus Attems. 



Genus PTYXOGON Chamberlin 



Ptyxogon Chambeklin, Bull. Amer. Mus. Nat. Hist., vol. 78, p. 500, 1941. (Geno- 

 type: Ptyxogon incus Chamberlin.) 



Range. — Northeastern Peru. 



Species. — Ptyxogon incus Chamberlin, 



Genus PYCNOTROPIS Carl 



Pycnotropis Gael, Mem. Soc. Sci. Nat. Neuchatel, vol. 5, p. 932, 1914. (Genotype : 



Polydesmus (Euryurus) taenia Peters.) 

 Amydrinus Chamberlin, Bull. Amer. Mus. Nat. Hist., vol. 78, p. 500, 1941. 



(Genotype: Amydrimis yongus Chamberlin.) 



Range. — Northeastern Peru, Ecuador, Colombia, Panama. 



Species. — Pycnotropis devillei (Silvestri), -flavocarinata (Silves- 

 tri), haenschi Carl, latzeli Attems, polygonata (Gervais), pongus 

 (Chamberlin), taenia (Peters). 



SIGMOGONOTROPIS, new genus 



Genotype. — Sigmogonotropis serratus.^ new species. 



Diagnosis. — Head smooth, clypeal furrow distinct, a prominent 

 ovoid swelling under each antennal socket. Collum and other tergites 

 smooth, underparts without tubercules or bristles. Anal sternite semi- 

 circular, without enlarged tubercules. Gonopod of male as follows: 

 Coxa small, without hairs; prefemur and femur coalesced, straight, 

 setose. Distally, set off by a definite constriction, are a long tubular 

 solenomerite and a long, slender, sigmoidally curved tibiotarsus, ter- 

 minally trifid and with a broad subterminal toothed lamina. 



This genus seems to be intermediate between Pycnotropis and Phi- 

 notropis. 



SIGMOGONOTROPIS SERRATUS, new species 



Figure 84 



Type speciTnen. — Male holotype, U.S.N.M. No. 1900, collected at 

 Cana, east Panama, by E. A. Goldman, June 1912. 



Diagnosis. — Characterized by the configuration of the male gonopod 

 as represented in figure 84. 



