280 BIOLOGICAL SURVEY OF 



Class DIPLOPODA Millipedes 



The synonymy of our millipedes is still in a state of con- 

 siderable confusion. Williams and Hefner (1928) have de- 

 scribed all of our forms, although not always under the names 

 used here. Blake (1931) gave notes on the distribution of 

 some of the species aaid some habitus figures and color notes. 



Subclass PSELAPHOGNATHA 



Polyxenidae 

 PoLYXENus Latreille 



P. PAscicuLATUs Say. (Williams and Hefner, 1928, p. 103, 

 fig. 6D; Blake, 1931, cover figure.) Found quite commonly 

 under stones on Bar Island near the bar. This is the most 

 northern known occurrence. Young were found the middle 

 of August, 1931. Males appear to be wanting. 



Subclass CHILOGNATHA 



Division PEOTERANDRIA 



Order PROTEROSPERMOPHORA 



Polydesmidae 

 PoLYDESMUs Latreille 



P. SERRATus Say. (Blake, 1931, p. 17, fig. 1.) The den- 

 ticulation of the carinae is sharp, and noticeable with but 

 slight magnification. The species is found, quite rarely, under 

 logs and stones. Heath south of Salisbury Cove and Corfield. 

 The Mount Desert Region is probably its northern limit. 



PsEUDOPOLYDESMus Attems 



P. CANADENSIS (Newport). (Blake, 1931, p. 18; Verhoeff, 

 1931, p. 305, figs. 1-7.) The last reference contains much 

 important structural detail. The denticulation of the carinae 

 is very ill-defined and visible only under moderately high 

 magnification. The species is not uncommon under logs in 

 more moist localities than the preceding. Duck Brook Path, 

 Lake Wood. 



