194 DIPLOPODA. 
with its bend nearer to the base than to the obtusely 
convex anterior angle of the keel ; lateral edge straighter, 
posterior angle squarer and sharper; posterior border 
more sinuous and more convex at the base; meta- 
zonites brown throughout, not or scarcely yellow 
posteriorly . 2. 2. 1... 6 ew ee ew ee ee rcuatus. 
n', Auxiliary branch narrow, gradually attenuated, principal 
branch more sinuous; smaller,contracted ? about 32 mm. 
in length ; keels smaller; anterior crest straighter, its 
bend continuous with and close to the rounded anterior 
angle; lateral edge more convex, posterior angles 
blunter, posterior border less sinuous, less markedly 
convex internally at base; colour doubtful. . . . . smithi. 
In the following table an attempt has been made to separate and affiliate the species 
by colour. In the case of the species which I have had no opportunity of examining, 
the information as to their pattern has been taken from authors’ descriptions. 
The following species based upon pallid individuals have been excluded :— 
simillimus, zapotecus, otomitus, consobrinus, and vicinus. 
a. Longitudinally banded; dorsal area yellow or reddish, with a longitudinal band 
on each side formed by a dark brown or blackish patch on each side of the 
metazonite of each segment and continuous with the corresponding patch 
before and behind; prozonites mostly pale above. 
b. Prozonites with a narrow median dark longitudinal streak . . . . . . = acolhuus. 
6, Prozonites without a median streak. . 2. 2. 1. 1 1 6 ew we ee. mystecus. 
a'. Not longitudinally banded, when there is a lateral dark patch upon the meta- 
zonite it is restricted to its anterior part. 
6. Transversely banded, with the posterior area of the metazonites blackish and 
the anterior area pale ; the prozonites also pale; first tergal plate black ; 
antenne also blackish . . . . 1. 1 ef ww ew ee ew ee BeNdalus, ? also smithi. 
b'. Otherwise coloured ; metazonites either pale with dark anterior streak and 
large dark spot on each side, or uniformly brown above or brown with 
pale narrow anterior and posterior rim ; when distinctly transversely banded 
the posterior area is yellowish and the anterior area dark brown, the brown 
apparently invading, at least in most cases, the posterior area of the 
prozonite ; at least the keels of the first tergal plate yellow. 
c. Brown of the median area of the metazonites forming a distinct longi- 
tudinal band not much wider than the yellow of the keels and not 
encroaching upon them anteriorly ; prozonites apparently pale; a median 
dark patch on the first tergal plate; antenne pale. . . . . . . . tepanecus. 
c'. Brown area of metazonites, when present, broader, generally very much 
broader than the yellow of the keels and encroaching more or less upon 
their anterior portions ; when, as in R. godmani, the yellow of the keels 
