Vol. 33, pp. 97-100 December 30, 1920 



PROCEEDINGS 



OF THB 



BIOLOGICAL SOCIETY OF WASHINGTON 



A NEW LEPTODESMOID DIPLOPOD FROM 



LOUISIANA. 



BY RALPH V. CHAMBERUN. 



The new diplopod here described is represented in a collection 

 of Myriopods made in and near New Orleans by Mr. H. Edward 

 Hubert, by whom it was transmitted to me for identification. 

 Other diplopods occurring in the material are Polydesmus 

 serratus Say, Callipus lactarius (Say), Paraujlus impressus 

 (Say), amd Spirobolus marginatus (Say). The chilopods oc- 

 curring are Scutigera forceps (Raf.), Neolithobius transmarinus 

 (Koch), Scolopendra viridis Say, Hemiscolopendra punctiventris 

 (Newport), Theatops posticus (Say), Arenophilus bipuncticeps 

 (Wood) and Linotaenia fulva (Sager) . 



In addition to the genus here described, two other unnamed 

 genera of leptodesmids occur in the eastern part of the United 

 States, these being characterized primarily by types of struc- 

 ture in the male gonopods different from those of the one dis- 

 cussed below and of the western North American genera. 

 The first of these may be designated Semionellus, with Lepto- 

 desmus placidus Wood as the genotype. The second may bear 

 the name Dicellarius, with Leptodesmus okefenokensis Cham- 

 berlin the genotype. 



Eurymerodesmus, Biolemann. 



Antennae filiform; joints two to five subequal, the sixth scarcely longer; 

 the normal four sensory cones. 



Collum of usual proportions, as wide as the second tergite or but little 

 narrower. 



All tergites wholly smooth; keels but moderately extended; margins 

 thickened, entire, smooth; anterior angles rounded, the posterior from 



21 — Proc. Biol. Soc. Wash., Vol. 33, 1920. (97) 



