353 



in its inland occurrences. Toward the north it is somewhat 

 synanthropic. 



Porcellionides Miers. 

 Subgenus Porcellionides, nom. nov. 

 Metaponorthus Verhoeff (1918, p. 129). 



Porcellionides (Porcellionides) pruinosus (Brandt), comb. nov. 



Previous records. — Mass.: Beverly, Salem (Richardson 1905, 

 p. 628). 



New record. — Mass. : Boston. 



This form is definitely synanthropic in New England. 



Trachelipus Budde-Lund. 



Trachelipus Budde-Lund (1908, p. 281); Tracheoniscus Verhoeff 

 (1917, p. 209). 



Subgenus Trachelipus, nom. nov. 



Tracheoniscus Verhoeff (1917, p. 210). 



Trachelipus (Trachelipus) rathkei (Brandt), comb. nov. 



Previous records. — Me.: Freeport (Rathbun 1905, p. 46), Port- 

 land, Westbrook, Washington Junction (Norton 1909, p. 251). 



Mass.: Lawrence, Lanesboro (Rathbun 1905, p. 46), Salem, 

 Beverly (Richardson 1905, p. 617). 



R. I. : Providence (Rathbun 1905, p. 46). 



Conn.: New Haven (Kunkel 1918, p. 247). 



New records. — Me. : Mount Desert Island, Jonesport, Beals 

 Island (Biol. Surv. Mt. Desert Region), Blue Hill, Brooklin, 

 Hampden, Newport, Farmington, Strong, Dixfield, Gilead. 



N. H. : Lancaster, Glen, North Woodstock, Center Harbor. 



Vt. : Guildhall, Walcott, Charlotte. 



Mass.: Middlesex Fells, Cambridge, Boston, Roxbury, Need- 

 ham, Sudbury, Sharon, Williamstown. 



R. I.: Riverview, Smithfield. 



Conn.: Kent. 



The wide distribution of this form is correlated with its 

 moisture requirement which is intermediate between and less 

 • restricted than those of P. scaber and P. pictus. A discussion by 

 Dahl (1916, p. 63) is illuminating in this connection. It should 



