52 BULLETIN OF THE ESSEX INSTITUTE. 



I may take this opportunity to state that Lepisma 

 occurs in Tokyo, according to Dr. Goto, and Professor 

 Mitsukuri informs me that Campodea is found in Japan, 

 as might be expected. v 



Family PODURID^ Tomosvart. 



Genus ACHORUTES Templeton. 



Achorutes commimis, n. sp. 



General color (Figs. 1 and 2) blackish gray, flecked 

 with pale gray ; the sternum, legs, furcula and interseg- 

 mental regions are pale gray, which is the real ground 

 color. A dorsal, interocular, black patch is present. 

 Eyes (Fig. 3) eight on either side, sitnated upon a black 

 patch. Postantennal organs consisting of four elevations 

 (Figs. 3 and 4), which are very variable in form and 

 arrangement; Fig. 4, showing these organs from the 

 right and left sides of the same head, exemplifies this 

 variability. Antennae subequal to the head, in length, 

 and stout (Fig. 5) ; segments, in relative lengths, as 

 6 ; 7 : 8:10; basal segment compressed longitudinally ; 

 second, barrel-shaped; third, swollen apically ; terminal 

 segment conical and blunt. Body cylindrical, its seg- 

 ments mostly subequal ; between the more anterior seg- 

 ments nre transverse, dorsal, lozenge-shaped areas of 

 pale gray (Fig. 1) each containing a narrow, blackish 

 band ; blackish dorsal and subdorsal stripes are more or 

 less evident. The head and body are tnberculate, as 

 usual, and are clothed with numerons short, curved 

 bristles, which are sparsely interspersed with longer, stiff 

 setffi. Legs stout, feet biunguiculate (Fig. 6). Superior 

 claw stout, curved, unidentate ; inferior claw half as 

 long, with broad base and acuminate apex; a single ten- 

 ant hair is present. Ventral tul)e stout, emitting two 

 rounded tubercles. Furcula (Fig. 7) short and stout; 



