376 



bulletin: museum of comparative zoology. 



Table 1. 



I^ength of body 



Type 9 32 mm. 



Paratype 9 36 mm. 



Paratype d" 21 mm. 



Greatest breadth 



5 mm. 



5 mm. 



4 mm. 



Number of legs 



34 pairs 



33 pairs 



30 pairs 



Although there IS a difference in proportions in the two females the 

 paratype is more fully expanded and consequently appears to be of a 

 more s ender form. The type female and the male are of very similar 

 shape (see Plate 2, fig. H). . ai 



Coloration. All three specimens are considerably decolorized from 

 their preservation m alcohol, but still show very distinctly the general 

 color-pattern of the body. To the naked eye, the legs and hZl 

 stripe directly above them are much lighter than the dorsal region, 

 exhibitmg a dul yellowish gray tint with distinct purplish cast which 

 IS much more distinct in one specimen. In all three, the legs are 

 decidedly paler than the pleural stiipe. The dorsal region, inchuJing 

 two thirds of the animal when seen from above, is much darker than 

 the pleurae and differentiated into a complicated color-pattern. 

 This consists in a light-colored median dorsal broad stripe, strongly 

 constncted between each body segment, and a narrow very dark 

 beaded or interrupted median line, the interruptions of which coincide 

 with the constrictions of the light stripe. Examined under a micro- 

 scope it is seen that the enlargements of the dorsal light stripe are 

 rhomboidal m form, but coalescent for about half their greatest width 

 along the intersegmental lines, so that their margins form a continuous 

 longitudinal serrate line. The dark color is confined to the space 

 between the body folds and does not include the apices of the papillae 

 even in the darkest portions of the stripe. The median blackened 

 line is discontinuous, passing over only fiye to seven folds on each 

 segment and is much more strongly pigmented on the three or four 

 alternate folds of each segmental group. The dorsal color-pattern 

 lades out on the head and next segment, and continues to the posterior 

 extremity of the body, although paler on the last two or three seg- 

 ments. The antennae are pale. 



Integmnent. The integumentary folds are very narrow on the 

 ridges with the transverse grooves between them deep. At the level 

 ot each leg two of the folds are incomplete, extending only about half- 



