368 PROCEEDinSTGS OF THE NATIONAL MUSEUM vol.83 



mm long and 3.3 mm wide and has 72 segments. The male type is 

 35 mm long, 3.2 mm wide, and has 75 segments. Anterior end of 

 body widening gradually from in front (fig. 32, h). 



First segment scarcely wider than head; lateral carinae less de- 

 veloped than in other species and more transverse ; surface with two 

 transverse rows of rounded tubercles. 



Except for a few segments at each end of the body, the others 

 have the posterior margin abruptly interrupted on each side of the 

 dorsum at the base of the lateral carina, the margin between the 

 carinae being produced backward and having a right-angled corner 

 at the base of the carina (fig. 32, ^). 



Segments with two transverse rows of smaller tubercles on the 

 dorsum than in B. rosea, the anterior row extending across lateral 

 carinae and containing 20 to 30 tubercles ; posterior row ending near 

 angulation of posterior margin, not extending onto carinae, and 

 containing 14 to 22 tubercles. 



Anal valves inflated and meeting at a reentrant angle. 



U, S. GOVERNMEI.r PRiriTING OFFICE: 19 



