■70 University of Michigan 



elevated, with mesal face of elevation commonly projecting 

 over base, grooved. (PI. 26, Figs. 183, 184.) 



The surface of the metazonites is more strongly rough- 

 ened, with distinct areas in considerable part developed and 

 a transverse furrow more evident on some of the segments. 



Length, 60 mm. ; width, 10 mm. 



Colombia: Fundacion River; Aug. 19, 1,913. One female 

 taken under a log. Holotype, M. C. Z.. 5,173. 



Chondrodesmus virgatus, sp. nov. 



PI. 26, Figs. 185. 186 



The animal is conspicuously marked dorsally wath alter- 

 nating cross bands of dull reddish brown and yellow, con- 

 siderably more than the caudal half of each metazonite being 

 yellow, the remaining portion and the prozonite being of the 

 darker color. Cauda proper yellow. Collum with yellow 

 caudal border and anterior border, which does not extend to 

 ends. Venter yellow. Head uniformly reddish. Legs red- 

 dish excepting proximally. Antennae yellow distally, proxi- 

 mally with reddish tinge. 



Collum strongly narrowed at sides in the usual manner. 

 Surface wholly smooth. 



All keels narrow. Tergites two to four with outer por- 

 tion narrow ectad, both corners of keel well rounded and 

 obtuse in general outline. Posterior angle of the keels of 

 the sixth segment is the first to be a little produced. Posterior 

 margins of all keels smooth and even, or at most very minutely 

 and irregularly uneven. All poriferous swellings are sharply 

 set off from the ordinary marginal rim in front, each lanceo- 

 late in outline with apex cephalad. See, further, PI. 26, Figs. 

 185 and 186. Surface without transverse sulci and otherwise 

 wholly smooth. 



